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Cell Cycle and Cell Division

Multiple Choice Questions

41.

Mitotic spindle have main protein

tubulin
myosin
tropomyosin
dynein

42.

Crossing over occurs in

zygotene
leptotene
pachytene
diplotene

43.

Number of chromosomes in an angiospermic plant is 14, then the number of chromosomes in synergid cells will be

44.
At what stage of the cell cycle are histone proteins synthesized in a eukaryotic cell?

During entire prophase

During telophase

During S-phase

During G₂ stage of prophase

During S-phase

Histone proteins are basic proteins used for the packaging of eukaryotic DNA. Both DNA and histones together comprise of chromatin, forming bulk of eukaryotic chromosomes. There are 5 major kinds of histones- H₁, H_2A, H_2B, H₃ and H₄.

H₁ histone is used for linking neighbouring chromosomes while others are used as elements of nucleosomes structure. During S- phase of cell cycle, synthesis of histone proteins takes place as the chromosome number gets doubled to that of somatic number.