The right answer is D.
Cytokinesis is final step of cell division, it is the separation of one cell into two. In animal cells a dividing groove separates the cell in two, under the action of an intracellular contractile ring formed of actin microfilaments that are associated with myosin molecules. Actin and myosin are two of the molecules responsible for muscle contraction. The contractile ring is formed by the contraction of myosin and actin. It is this contraction that will decrease the size of the ring and thus cause the separation of the cell into two cells.
The microfilaments help in the splitting of daughter cells during cytokinesis or cell division.
Further Explanation:
The process of cell division is known as cytokinesis and it results in the production of two daughter cells as the cytoplasm of the parent cell divides. It occurs as a result of meiosis or mitosis, which is a type of nuclear division. These nuclear divisions cause the formation of two nuclei in a single cell. An essential step is performed by cytokinesis, which involves the separation of a cell into two halves, each containing one nucleus. It starts during anaphase and nuclear division phase and extends till telophase.
The cytoskeleton consists of a polymer of actin protein that supports the structure of the cell and keeps the organelles intact. It is known as microfilament. Microfilament plays a role in muscle contraction, cell movement, and cell division. They consist of two strands of actin protein, which together form a spiral structure. The actin subunits that are used to form microfilament are known as globular actin (G-actin), while once they are linked together, the F-action or filamentous actin is formed.
One of the crucial functions of microfilaments is in cell division. It helps in the process of cytokinesis, which is the physical separation of daughter cells. An actin ring is formed during cytokinesis surrounding the cell to be dividing. The actin is pulled by myosin, causing it to contract. With time, the ring becomes narrower, splitting the two cells. The microfilament breaks down, resulting in the disassembly of the ring when it is not required.
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Answer Details:
Grade: College Biology
Chapter: Cytoskeleton
Subject: Biology
Keywords:
Cytoskeleton, actin , filament, microfilament, G-actin, F-actin, cytokinesis, nuclear division, cell division, mitosis, meiosis, actin ring.
