Actin College Essays Samples For Students

Structure and Functions of Cytoplasmic Actin

Cytoplasmic actins refers to the conserved proteins. Actin can be found in all eukaryotic cells, and are involved in variety of cell motility. Protein structure is formed by combination of variety of amino acids by losing the molecule of water. Proteins get involved into variety of biological functions, and proteins have different types of structures depending upon the requirements. This paper intends to discuss different types of protein structures, their functions and other related aspects.
The structure of proteins can be divided into three categories i.e. primary, secondary and tertiary. The structures of proteins are polypeptides-sequences that get ...

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 ...

Question 1

The cerebellum is an essential part of the neuromuscular system in that it plays major roles in the timing of muscular activities and the smooth progression of one muscular movement to the next. The summary of how this is done is that it sequences all the muscular activities necessary for a particular movement, and then makes corrective adjustments as necessary when the movement is being executed so that they conform to the motor impulses being generated by the cerebral cortex and other significant parts of the central nervous system (Ganong, 2005).
For instance, for an individual holding a cup and ...

Muscle contraction is a very important activity that enables an organism perform various bodily movements and flexible actions, in response to nerve stimuli. Muscle fibers are multinucleated long cylindrical cells that have an outer membrane called sarcolemma, and are mainly composed of contractile elements called myofibrils (Dougherty, 2016). Myofibrils are made up of repeating units called sarcomeres. Sarcomeres in turn are composed of (thin) actin and (thick) myosin protein filaments called myofilaments (Dougherty, 2016). The muscle fiber structure and organization is shown in Fig 1.

Contraction Mechanism – Sliding Filament Theory

According to the sliding filament theory, during contraction myosin filaments remain constant in length, ...

- The stromal cells that are found in the developing gonads of tetrapods begin from the medulla from the peritoneal wall and the cortex from inter-renal blastema or mesonephric. Hence the gonads have a dual origin.
- Spermatogenesis occurs in a syncytial complex because it involves the formation of sperm from undifferentiated cells that are first attached to rachis. Syncytial cell complex or syncytium result when cells with single nuclei fuse to for a cell with nucleus. Syncytial cell complex is vital in oogenesis in that it assists in the differentiation of cells. One other developmental model is vitellogenesis.
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Mitosis is an essential process in the cell cycle for the growth and development of an organism. Over the years, numerous studies have been conducted to understand the dynamics of mitosis and literatures about the process are fast accumulating. However the mechanism that is important in the vicissitudes of cellular shape during mitosis has remained unknown. Until later, a groundbreaking research on a “small ubiquitin-related modifier” (SUMO) will unravel the mystery that takes place when the cell changes its shape during mitosis.
It is a general knowledge that during the early stage of mitosis, the cell takes a round shape at the ...

Chapter #16:

Question 1.
Insect-eating birds will decrease in number since their source of food has been reduced. The birds may also migrate to warmer areas during this period.

Question 2.

The habitat is the specific place where the organism lives e.g. a fish’s habitat is water. On the other hand, niche is the position and the role played by the organism in an ecosystem. It includes how the organism obtain food and shelter, the mode of survival, and the mode of reproduction (Sutton & Anderson, 2009, p. 46). For instance, a lion’s niche in the ecosystem is that of a predator.Question ...

Muscle plays important roles in the body. Those roles are attributed to the uniqueness in its anatomy and physiology. There are different types of muscles. This extends to its structures and functions. There are smaller which are in the groups of the ocular muscles and the bigger muscle in the range of biceps. It is an organ system which is usually categorized into three major forms. These are the skeletal muscles, smooth muscles and the cardiac muscles. The location, structures and function of each category is different. The major functions that is being performed by this organ is related ...