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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 ?

Mitotic poisons are the substances which inhibit mitosis.

For example -

1. The ribonuclease enzyme acts as poison at prophase.

2. Mustard gas causes fragmentation and agglutination of chromosomes.

3. Colchicine inhibits the formation of mitotic spindle.

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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 ?

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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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