Essays on Cytoplasm

Hi. I am streptococcus bacterium. I belong in the family Streptococcaceae. My name streptococcus means twisted berry which describes mu characteristic grouping in chains which looks like a string of beads. I am nonmotile and gram positive. I am a common type of prokaryote. I can cause various diseases in humans and animals. If I were to look for a partner, I want something that thrives in the anus, pharynx, and skin because these are my carrier state. I can also look for a partner in raw milk and contaminated foods like eggs and milk. For me, the dirtier ...

Abstract

Paget's disease of the breast is an uncommon kind of cancer of the nipple–areola complex and that is time and again connected to a fundamental in situ or persistent carcinoma. We provide an overview and evaluate the key clinicopathological and healing aspects of mammary Paget's disease. Patients suffering from the Paget disease frequently present with a constant, eczematous skin complaint on the nipple and adjoining areolar skin. Paget's disease of the breast has been acknowledged as a separate clinical unit for over one hundred and twenty years. Since the situation in itself is repeatedly harmless and restricted to ...

Question 1

Angiosperms can be dioecious or monoecious and they go through sexual production (Raghavan, 1999). Angiosperm flowers are considered to be hermaphroditic or androgynous because the same flower contains both female and male gametophytes. However, angiosperm flowers with only female gametophytes are incomplete and considered to be either a carpellate flower containing only female parts or a staminate flower containing only male structures. The male reproductive structure of the angiosperms is known as andoecium. The anthers that are found in the stamens of the angiosperms contain pollen sacks, which have the microsporocytes. The cells go through a process known as ...

Q1. Explain the regulation of the cell cycle

Every cell is regulated by particular checkpoints to ensure that the daughter cells are exact duplications. This is to help guarantee that cell mutations are not passed on to the next generation of cells. In eukaryotic cells, there are three main checkpoints. These are points at which cell replication can be halted until certain conditions are met (Boundless, 2016). The first checkpoint is near the end of the G1 phase. It is here that DNA gets evaluated and checked for damage. If damage has occurred, it either gets corrected or gets prevented from moving on to the next phase ( ...

Introduction

Cellular respiration and photosynthesis are vital reactions in living organisms since without the two; there would be no life on earth. Cellular respiration involves a set of metabolic reactions that take place in cells of living organisms thereby converting nutrients like sugar into adenosine triphosphate (ATP) (Osterhoudt & Barhydt, 2010). On the other hand, photosynthesis involves the conversion of carbon dioxide into organic compounds by the photoautotroph in the presence of sunlight. Most animals attain their energy requirements through cellular respiration while on the other hand; photosynthesis is performed by most plants that can make their food. These two reactions ...

{Author Name [first-name middle-name-initials last-name]} {Institution Affiliation [name of Author’s institute]} A cell is a form of the miniature factory that encloses a distinct chemical system that is involved in structural maintenance, homeostasis, energy generation and reproduction. Every organism is made of these structural living units. The cell divides and produces more cells and assists in the growth of the organism. There are two types of cells, eukaryotic and prokaryotic. Eukaryotic cells are characterised by a membrane-bound nucleus enclosing the genetic material. The Eukaryotic cells can be divided into three main parts, plasma membrane, cytoplasm, and nucleus (Cooper & ...

Introduction

Osmosis is the process by which water molecules move from a region of low concentration of solute to a region of high concentration of solute through a semipermeable membrane (Van 3). Osmosis therefore can define the movement of water in and out of the cytoplasm of a cell. A solution with a higher concentration of solute molecules than that of the cell cytoplasm is said to be hypertonic to the cell. On the other hand, a solution with a lower concentration of solute than that of the cell cytoplasm is said to be hypotonic to the cell. Purpose: The ...

Paramecium is a unicellular organism belonging to genus, Protozoa. Like many other Protozoa, paramecium has ciliated body that aids in locomotion. The habitants of protozoa vary from fresh water bodies, marine water, brackish and stagnant waters in in basins and ponds, (Ladenburger 7). Some species of paramecium can easily be cultivated and induced to conjugate. Due to these characteristics, paramecium has been used in laboratories for research purposes. The body of a paramecium is covered by cytoplasmic structures which are called cilia. Cilia are hair like structures which helps the organism in movement. The flickering movement of cilia propels ...

Question 1

For succinate oxidation to fumarate there is yield of 2H+ and 2 electrons; however, the process of the reaction skips one step thereby leading to 2 ATP. The resulting FADH2 electrons skips the first stage of oxidative phosphorylation by moving into the electron transport chain located in CoQ. This can be illustrated as NADH -> CoQH2. Consequently, there is 2 ATP forming stages found in the electron chain from CoQ to O2 used in this course (Schwender et al, 50). Indifferent to the first scenario, oxidation of malate to produce oxaloacetate results to NADH, with production of 2H+ and ...

Ans1: Growth is defined as the increase in size and mass of a particular organism over a period of time. It is measured in terms of biomass (mass of the organic material). An organism grows by mitosis. Growth stops after certain age of the organism. Growth is quantitative and measured by taking the measurement of height, weight, size and shape of body organs like brain, etc . Development is defined as the process of cells differentiation which helps in the development of the body. It adds complexities to the body (such as organ development). Development of the organism is a ...

DNA (Deoxyribonucleic Acid)

Deoxyribonucleic acid, DNA, is the primary structure that carries the genetic material in cells of living organisms and some viruses. The DNA is made up of strands of nucleotides that are made up of nitrogenous bases, a phosphate compound and, a ribose sugar. The nucleotides form a ring or ladder that over lapses to form double helix strands of polynucleotides. DNA aggregates to form the chromosomes that are strictly found within the nucleus of the cell. Some DNA are found in the ribosomes outside the nucleus. In the DNA structure, the series of the bases is arranged, and the sequence in one ...

Gene expression refers to the mechanism by which information from a gene directs the synthesis of proteins. This process is utilized by eukaryotes and prokaryotes. Gene expression involves various steps. These includes; transcription and translation. The central dogma indicates the flow of genetic information from the Deoxyribonucleic Acid to Ribonucleic Acid and synthesis of the required protein.

Transcription is the production Ribonucleic Acid copies of Deoxyribonucleic acids in the nucleus. The DNA consists of two anti parallel complementary strands, each having 5’ and 3’ ends. The strands serve as a template strand for the production of an RNA transcript. The ...

DISCUSS THE ROLE OF ION CURRENTS IN DETERMINING THE SHAPE AND DURATION OF CARDIAC ACTION POTENTIAL

Introduction Selective permeability to various ions is an important characteristic of cell membranes, one that determines myriad cellular functions. In animal cells, ion permeability and the electrical potential generated thereof determines the activity of neurons, myocytes and the like. The electrical potential depends on the concentration of the ions inside and outside any given cell, the permeability of the cell membrane to the ions and the ion channels that are present on the surface of the cell. Cardiac cells also possess different ion channels on their surface. These determine the two types of electrical potentials, namely, resting membrane ...

Biology Assignment

- Cellular respiration is the metabolic process through which glucose is broken down in the cells to produce energy in the form of ATP. Anaerobic respiration or glycolysis is the anaerobic breakdown of glucose into ATP, which requires no oxygen. This process involves removal of hydrogen and electrons from glucose to generate NADH, pyruvate and energy equivalent to two molecules of ATP. In the absence of oxygen pyruvate undergoes fermentation, whereas in the presence of oxygen, pyruvate is siphoned into the mitochondria and is completely broken down. The citric acid cycle occurs in the matrix of the mitochondria and ...

Introduction

Elodea canadensis is a perennial hydrophyte, which is native to the majority of North America and was first recorded in about 1836 from the British Isles (Hackney, 1992). Young plants at first begin with a seedling stem and roots grow in mud at the underneath of water. More adventitious roots arise at intervals along the stem. The leaves are translucent, bright green, oblong, 1-4 mm broad and 6-17 mm long, borne in whorls of three round the stem (Rose, 2006). It lives completely submerged.

Blepharisma is a unicellular ciliate protists genus found in salt and fresh water (Miyake, Harumoto, Salvi, & Rivola, ...

1. When placed on an agar slab and incubated at 30°C for 2 days, a single yeast cell proliferates into a colony with a diameter of 2 mm containing 108 yeast cells. If the cell has a functional Ade2 gene (Ade2+), the colony will be white; if Ade2 is non-functional (Ade2–), the colony will be red. You take a strain with a mutant Ade2– at the regular chromosomal position (red colonies) and insert a second, functional Ade2+ gene near the telomere. You find that the colonies are a mixture of red and white patches or sectors. Figure 1 shows some colonies; the black regions represent the ...

Severe acute respiratory syndrome is a life threatening condition that is caused by a virus from the Coronaviridae family. The SARS virus is believed to have originated from the Guangdong province of southern China before spreading to Hong Kong, Canada and the United States of America. The virus has an incubation period of 2 to 7 days but it may last up to 10 days. Like other respiratory disease, SARS is spread through direct contact; long range and short range. The major agent of transmission is the droplet nuclei. The symptoms of the disease include: fever, chills, malaise, cough, dyspnea and ...

Lab 1: Ethical Issue in the Movie Gattaca. The epicentre of ethical issues in the movie Gattaca is the manner in which an individual ought to be judged. Should it be by the genetic composition one is born with or by the character traits, personality attributes and ambitions chosen by an individual? Vincent is born with genetic weaknesses that could result in ailments in the future. His genetic composition denies him access to his dream job despite the fact that he achieves the required grades in school and is a strong and athletic young man. As a result, Vincent designs a plan to ...

These two readings emphasize on how it is interesting to know that cell evolution research is advancing in new and exciting ways at the intersection of genomics, cell biology, molecular biology, biochemistry, and microbiology. The aim of the papers is to reexamine one of the more revolutionary conjectures made to account for the origin of the complicated kind of cell that is the structural unit of the higher animals and plants. The first reading is entitled “Origin of eukaryotic cells: 40 years on”, the paper is authored by John M. Archibald. The book is aimed at discussing the ...

Human Immunodeficiency Virus, a main cause of worldwide AIDs, belongs to the Lentivirus genus of Retroviridae family. Pathogen causes chronic type of symptoms, taking a long time of latency it constantly keeps replicating inside human body. HIV is categorised into two types, HIV-1 and HIV-2. The genome of this retrovirus consists of two single-stranded RNA molecules. Though, both are involved in AIDS, HIV-2 seemed less virulent and demonstrated more frequent connections with the disease of central nervous system (Fanales-Belasio et al. 5). Like other retroviruses, the genes located on HIV chromosome are gag, pol, env. The functions of gag, pol ...

Abstract

Human XPA is a protein engaged in DNA damage recognition and repair. A mutation in the gene encoding the protein causes an autosomal recessive disorder, xeroderma pigmentosum (XP), which renders an individual sensitive to sunlight and causes skin cancer. XPA is a 273 amino acid protein, which is predominantly localized in the nucleus. It is expressed at both high and moderate levels in several tissues. The protein serves as a damage sensor in a nucleotide excision repair mechanism, through which the damage to a DNA strand is verified and repaired by formation of a newly synthesized strand. Besides this primary NER mechanism, XPA in conjunction ...

Introduction

Obesity and overweight have been classified as global and serious conditions that have an adverse effect on the human health. Obesity and overweight conditions are defined as excessive or abnormal accumulation of fat that may negatively affect health. In adults the obesity and overweight are measured by the body mass index (BMI), which is simple weight-for-height index (WHO, 2014). The BMI is computed by the ratio of the individual's body weight to the square of body height, indicated in Kg/m2 (WHO, 2014). According to W.H.O., (World Health Organisation), a BMI equal or above 25 is considered as overweight while a BMI ...

(Author)

Regulation of Xiap Protein in Breast Cancer Breast Cancer Breast cancer is the type of cancer that develops in the tissues of the breast. Two most commonly reported types of breast cancer are “ductal carcinoma” and “lobular carcinoma”. Ductal carcinoma is initiated in the lining of the milk ducts, which are thin tubes involved in carrying of milk from lobules of the breast to the nipple. Ductal carcinoma can be in the form of Invasive ductal carcinoma (IDC) as well as Ductal carcinoma in situ (DCIS). IDC is the most commonly found type of breast cancer ...

Introduction

As a multi-functional protein, Cytoplasmic Actin can be found in all eukaryotic cells at higher concentration levels of over 100 μM. It is the most abundant protein found in most eukaryotic cells, which makes it a critical player in different cellular functions, such as maintaining cell shape and polarity to transcription regulation. The structure of Cytoplasmic Actin is distinguished by a large number of polymorphic proteins which form the filaments. In eukaryotic organisms, such as archaea and eubacteria, actin-like proteins activities are related to sub-cellular organization, motility, cell shape maintenance and cell cycle progression; they are either associated to cell membrane or ...

Properties of Life

When it comes to dealing with cells as a structural and functional unit of all kinds of life on earth, it is important to understand the biological concept of what constitutes life. Most biologists, including cell biologists will agree that life is defined according to seven principles. First, that living things are composed of cells. A cell is a unit that makes up all kinds of life, whether it is a bacterial life or plant life or human life. The second principle is that there are different levels of organization in life – cells make up tissues, tissues make up organs, and so ...

Introduction

Herpes Simplex virus type 2 (HSV-2) is a virus that belongs to the alpha herpes viridae subfamily and causes genital ulcer diseases. The transmission of HSV-2 occurs most often due to a sexual intercourse in humans, although it can disseminate through physical contact with the lesions and saliva from the patients. Medical professionals may contract the infection and lesions on their fingers, if they inadvertently contact the patient’s vaginal mucosa or mouth, without using appropriate gloves. The HSV-2 infection is known to be asymptomatic in 80 % of the cases . Genital herpes is a frequent infection acquired during pregnancy and about 5 % ...

Tissue and Cellular Organization

The circle of life on the earth is very complicated, though sometimes it seems to be rather easy. People see plants, insects, various fluids, surface and soil, but they often do not think of all the complexity of the constitution of bodies that fill up the world. In other words, everything consists of cells and tissues, and in order to understand the essence of every matter it is important to investigate their structure. There are some organisms, such as bacteria, that are unicellular or they are made up of only a “single cell” (Science Daily, 2014). These one-celled organisms ...

Differentiation of white blood cells by light microscopy

Most mammals have blood consisting of three types of blood cells, Red blood cells (Erythrocytes), White blood cells (Leukocytes) and Platelets (Thrombocyte). These are collectively termed as hematocyte, which simply means blood cell. These cells constitute to around 40% to 45% of the blood volume. The remaining consist of Plasma, which is referred to the liquid part of blood. The total volume of blood can be determined by centrifugation or flow cytometry. The 45% of blood component (blood cells) is termed as hematocrit. Another important component of blood is hemoglobin, which gives blood its red color. It is ...

- Ingestion of fava beans increases the formation of free radicals in red blood cells which in turn causes disruption on the normal functioning or reduction of Glucose-6-Phosphate Dehydrogenase enzyme. Consequently, glucose-6-phosphate dehydrogenase reduces and therefore the red blood cells are incapable of defending themselves from the detrimental effects of reactive oxygen species. This makes the damaged cells to breakdown and rupture prematurely hence hemolysis.

Glucose-6-phosphate dehydrogenase pathway

The G6PD gene is located from base pair 153,759,605 to base pair 153,775,795 on the X chromosome. - Fatty acid synthesis occurs in the cell cytoplasm. Fatty acid synthesis ...

The Flu is Heading to the Zoo

The bird flu in China has raised a growing concern to medical researchers who are attempting to study the genetic behavior and sequences of the H7N9 virus together with other H7 strains and avian influenzas. Three people have been killed with approximately 10 others infected raising speculations and questions of the spread of the virus between humans to humans and birds to humans and the consequent risk of a global epidemic. Certain researchers are however worried especially since the virus has been reported to have genetic markers that will aid a faster spread within the human populations amidst claims that the virus ...

Cell Cycle

Introduction Asymmetric cell division is a situation where a cell divides into parts of two cells that comprise two dissimilar cellular fates. For most part, the term applies and is usually used in referring to cells that are essentially diverse at the point of cytokinesis. Cytokinesis is the term used to describe how the cytoplasm and its organelles divide to form two separate cells. The daughter cell formed contains the same genetic material as the mother cell. This implies that individual daughter cell comprise a diverse physical makeup. This stands to convey the contrast surrounding extrinsically dissimilar cells where individual cell ...

The bird flu in China has raised a growing concern to medical researchers who are attempting to study the genetic behavior and sequences of the H7N9 virus together with other H7 strains and avian influenzas. Three people have been killed with approximately 10 others infected raising speculations and questions of the spread of the virus between humans to humans and birds to humans and the consequent risk of a global epidemic. Certain researchers are however worried especially since the virus has been reported to have genetic markers that will aid a faster spread within the human populations amidst claims that the virus ...

Bioinformatics combines the subjects of biology, mathematics and computer science in to a single field of study. There are various tools available for the biomedical researchers so that they are able to find out the desired biochemical, genomic and medical information. Search programs, data base storage and software programs are some types of bioinformatics tools that help in the analysis of proteomic and genomic data. The web based tutorial of bioinformatics programs will be used in this study to analyze the most important enzyme of fertilization called phospholipase C-gamma. This tutorial will use the bioinformatics tools easily acquired from the ...

Introduction

Science, technology when applied to the natural way how a human’s body and all of its corresponding organ systems operate can be referred to as biotechnology. Biotechnology has emerged as one of the most lucrative and fast developing field of medicine combined with technology. It can be defined as the utilization of organisms (e.g. humans, animals, plants, etc.) or any living system to create, develop, or improve products that can be used to make a particular task easier, or more efficient . In an era characterized by rapid and even unpredictable improvements in technology, one can assume that the same rate ...

Webliography

Web Address: http://evolution.about.com/od/Overview/a/Types-Of-Cells.htm Description: According to this we bite, a cell is a basic unit of living organisms. All living organisms have cells. While others are simple unicellular, others are made up of many cells. There are basically two distinct types of cells: prokaryotic and eukaryotic cells. They are fond in different types or organisms. Each type of cell is made up of different organelles. These are specialized in performing different roles. Basically, prokaryotic are the simplest group of cells on earth. Unlike the eukaryotic cells, they are found in single celled organisms such as bacteria and amoeba. These are ...

Why should anyone believe him? Yet that initial view through the microscope confirmed what he had nervously anticipated for days, as he now had to quickly decide who he should tell and, more importantly, when it should be said. Excitement shone on Stanley’s face as he saw his cell samples accepting the spider cytoplasm. He had drawn inspiration from Spiderman and decided that it was his calling to step into his favourite superhero’s shoes. For once he felt lucky for himself of being a biology student, which otherwise turned out as a regret at most of the times. He ...

of HT22 Cells derived from Mouse Hippocampus

Sections I and II

Biology Section I 1. Introduction Fluorescent protein development research has gained increased knowledge about the range in the color palette available from the Aequorea Victoria jellyfish. The wavelength emissions in the blue to yellow range are now better understood. [1] Another area that has seen a great improvement in knowledge is the understanding of emissions of the monomeric fluorescent protein emissions in the orange to far-red spectral region. [1] The spectral region of fluorescent in the orange to far-red is derived appropriate reef coral species. [1] This area of research ...

- Heterogeneous nuclear ribonucleoproteins is a protein that comprises of RNA binding proteins. It is a complex made up of RNA & proteins that is characterized by binding of premRNA. This occurs in the nucleus during the transcription and post transcriptional stages of preMRNA. The protein has different roles which include; prevent formation of secondary structures by preventing folding of pre-mRNA, inhibit the interaction with other proteins, usually has a link with the splicing apparatus and transportation of the mRNA away from the nucleus. This type of protein is a multidomain protein with multiple RNA binding proteins. RNA recognition Motif which is the commonest ...

1.0 Mitochondria in eukaryotic cells Organelles are special compartments surrounded by a bilipid membrane which separates them from the rest of the cell which carry out specific functions. An example of an organelle is the mitochondria which are known to be the “powerhouse of the cell.” They have their own genome (mtDNA) and are semiautonomous. They are said to have evolved from a free α proteobacterium like organism (Takasugi, Yagi, et al., 2010). The word mitochondria is derived from two Greek words: “mitos” which means thread and “chondros” which means “grain”. These two words offer an apt description of the morphology ...

The experiment essentially investigates the association between endoplasmic reticulum and mitochondria.

Introduction

Mitochondrion is a cell organelle, which moves along actin filaments. They are also calcium storage sites in the cell. The positioning and movement is influenced by membrane-cytoskeleton interactions. Reports suggest that the release of calcium from mitochondria and endoplasmic reticulum is influenced by structural changes in microtubules.

Materials used.

1. YFP-HDEL/atp-mito-CFP line. 2. 2μM Latrunculin-B 3. Ethanol control. 4. Arabidopsis Sail359/Aequroin line expressing atp-GFP-Aequorin.

Procedure

Actin depolymerization affects mitochondrial clustering and movements. In the experiment, YFP-HDEL/ atp-mito-CFP line was treated with 2μM lat-B for 3 hours and ...

Muscular dystrophy is an inherited disease where the different genes that control muscular function are defective (Emery, 2008). It has been found that many forms of dystrophy are caused by a deficiency in dystrophin, which is a muscle protein (Emery, 2008). This disease is not infectious and cannot be acquired from any activity. It is characterized by muscle weakness and wasting where the specific muscles affected vary for different types of dystrophy (Emery, 2008).

Among the various types of muscular dystrophy, the Duchenne muscular dystrophy is the most prevalent, with an occurrence of twenty to thirty cases for every one ...

Latrunculin B, methyl viologen and Antimycin A treatments on plant mitochondria which is the powerhouse of the cell. They all cause respiratory and metabolic inhibition directly or indirectly. Hence some are employed as herbicides and some used mainly experimentally to inhibit the respiration process in plants

The cell is the smallest unit of all living things. Both plants and animals are made up of cells which is the centre of control of all activities. These cells in turn are made up of several organelles like the nucleus, the cytoplasm, the nucleolus and the mitochondria all working as a team. Both ...

Introduction

Platelets comprise of a very important component in the blood. They prevent blood loss in the body. This is enhanced by formation of an entangled mesh made of fibrinogen which is activated by calcium ions and the von Willbrand factor. A complex physiology ensues within the first few minutes of exposure of the tissue underlying the epithelial tissue in the skin (Hoffman 2009, p.123). Platelets also play a very important role in ensuring the pathogenic organisms are prevented from entering the body through the exposed tissue on the skin. This paper comprise of various components which are intended to illustrate the ...

Abstract

Plasmodium falciparum is the parasite responsible for the deadly disease, malaria. The parasite is transmitted through the injection of sporozoites into the human blood stream. These sporozoites are transported in the blood stream to the liver. The sporozoites invade the hepatocytes and differentiate into merozoites. The merozoites invade the RBCs of the host; starting the blood stage of infection. The trophozoite stage ingests and degrades approximately 80% of the hemoglobin in the host cell. The hemoglobin is broken down into peptides due to enzymatic action by a metalloprotease and cysteine and aspartic proteases. Haematin is first released as a byproduct of ...

Describe the Hemoglobin Digestive Process

P. falciparum, is the parasite responsible for the malaria, a disease that causes approximately one million deaths annually. It undergoes the process of erythrocytic schizogony which is responsible for the clinical manifestations of malaria. The trophozoite ingests and degrades approximately 80% of the hemoglobin in the host cell (Brayl 2005). As the trophozoite continues to develop, its endolysosomal system takes up the cytoplasm of the host cell using cytosomes which contains host hemoglobin. Cytosomes are formed by an invagination formed from the PVM (parasitophorous vacuolar membrane) and PPM (parasite plasma membrane) from which transport vesicles are pinched off. These vesicles ...

Hantaviruses

Scientific name of the causative organism: The scientific name depends on the species because the hantavirues have been classified into a number of species for instance Hantavirus sin nombre virus I. Classification

Superkingdom: Not applicable

Kingdom: Not applicable Phylum: Not applicable Order: Not applicable Family: Bunyaviridiae Genus: Hantavirus Species: A number of species have been identified so far, these include the Sin Nombre Virus, Andes Virus, Hantaan Virus, Seoul Virus, Puumala Virus and Dobrava Virus.

Strain: Not applicable

II. Structure and morphology If viral: Attachment to humans, enveloped or not, size, DNA or RNA, single or double stranded, integrates ...

Mitochondria and Endoplasmic Reticulum

Literature Review

Literature Review - Interactions Between Mitochondria and Endoplasmic Reticulum and Mitochondria Calcium Dynamics The interactions between mitochondria and endoplasmic reticulum in plants have great significance in the ability of the plant to self regulate, grow well and even fight off toxins. Calcium is very important for strengthening cell walls (Holdaway & Helper, 2003). The dynamic of calcium up-take has been studied since the 1800s due to the importance calcium has as a regulator for successful growth and development of plants (Hepler, 2005). The intricacies of the part Calcium plays in intracellular reactions which regulate growth and development ...

Hepatocellular carcinomas (HCC) exhibit genetic heterogeneity. Most of the HCC tumors are associated with activation of insulin/IGF-1/IRS-1/Ras/Raf/MAPK/Erk and a WNT/Frizzled receptors/β catenin signaling cascade which provides targets for therapy. All the pathways are mediated by genetic mutations and signaling compounds and the loss of regulatory proteins also contributes for tumor generation. Two signaling pathways are involved in the carcinogenesis which includes insulin/IGF 1/IRS 1/MAPK and Wnt/FZD/β catenin pathways. The insulin/IGF-1/IRS-1/MAPK cascade plays a crucial role in regulating regeneration of liver and embryonic development. The constitutive activation of these cascades which is due to IRS 1 over expression leads to HCC ...

How an Animal Cell Survives

Although the animal cell is similar in many ways to eukaryotic as well as some few eukaryotic cells, there are strikingly large differences between them, especially the requirements for survival in various environments (Baitsell, 2008). The animal cell is one of the members of eukaryotic cell category, whose structure is quite complicated by the organelles present as well as the diverse functions they play towards the survival of the cell and the organism in general (Solomon, Berg, & Martin, 2004). The cell structure is defined by a plasma membrane that bounds a number of organelles, all of which function towards the ...

Introduction

Biology is broad and therefore embraces various topics in life that concern living organisms. Micro biology for instance deals with the study of very small organisms that are able to reproduce and sustain their generations. This is where the study of prokaryotes comes into the scene. The contrasting organisms to prokaryotes are referred to as eukaryotes. Contrary to prokaryotes, eukaryotic organisms have complex cell structures. Biology tends to full describe the complete nature of these organisms, their feeding habits, how they reproduce and where they thrive best, that is, their habitats.

Prokaryotes are single celled organisms whose cells lack ...

Aims

1. To observe and investigate the effects of osmosis across the cell membranes of a plant. 2. To investigate the ability of different molecules to diffuse across a selectively permeable membrane.

Introduction

All living cells are enclosed by an outer covering known as plasma or cell membranes. In addition, these plasma membranes serve as barriers between different compartments in the body to confine processes and materials to certain locations. Examples of these processes are diffusion and osmosis which are the main physiological processes that play important roles in the body. Diffusion can be defined as the process by which molecules move ...