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Cell Cycle and Cell Division

Short Answer Type

21. What are motor proteins ?

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22. Why Meiosis II is necessary when cell is divided in Meiosis I ?

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Long Answer Type

23. Describe cell cycle.

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24. Describe significance of mitosis.

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25. What are mitotic poisons ?

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26. Describe Meiosis II or Homotypic division.

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27. Describe significance of meiosis.

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Short Answer Type

28. Why does a multi cellular organism require two types of cell division ?

There are two distinct type of cell divisions taking place in multicellular organisms. One is mitosis in somatic cells for growth and healing of wounds and the other is meiosis in reproductive cells for producing gametes having half the number of chromosomes in order to maintain the number of chromosomes in the organism. It is essential to maintain the characters of the species. Therefore both type of cell division are necessary for an organism.

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Long Answer Type

29. “A well known biologist stated that the life history of an organism can be summed up as gametic fusion, equational division and reductional division.” Comment.

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30. Why is meiosis called the reductional division and mitosis called equational division?

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