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Cytokinesis & Significance of Mitosis Video Lecture | Biology for ACT

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1. What is cytokinesis and how does it relate to mitosis?

Ans. Cytokinesis is the final stage of cell division, where the cytoplasm of a cell divides, forming two separate daughter cells. It is closely related to mitosis as it follows the nuclear division of mitosis and completes the process of cell division.

2. What are the main differences between cytokinesis and mitosis?

Ans. Cytokinesis involves the division of the cytoplasm, while mitosis involves the division of the nucleus. Cytokinesis occurs after the completion of mitosis, whereas mitosis consists of several phases, including prophase, metaphase, anaphase, and telophase.

3. How is cytokinesis regulated during the cell cycle?

Ans. Cytokinesis is regulated by a protein complex called the contractile ring, which forms a belt-like structure around the cell's equator. This contractile ring consists of actin and myosin filaments that contract and pinch the cell membrane, resulting in the separation of the cytoplasm and the formation of two daughter cells.

4. What is the significance of mitosis in multicellular organisms?

Ans. Mitosis plays a crucial role in the growth, development, and maintenance of multicellular organisms. It ensures the proper distribution of genetic material to daughter cells, allowing for tissue repair, organ regeneration, and overall growth of the organism.

5. Can cytokinesis occur without mitosis?

Ans. Cytokinesis is tightly linked to mitosis, and in most cases, it occurs immediately after the completion of mitosis. However, there are rare instances where cytokinesis can occur without nuclear division, resulting in multinucleated cells. This phenomenon is observed in certain types of cells, such as muscle cells and some fungi.

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