Synthesis of microtubules increases in:
Correct answer: D. G2 phase
- A. M phase
- B. S phase
- C. G1 phase
- D. G2 phase
Explanation
Following the G1 is the S-phase (synthesis phase) during which the DNA is synthesised and (chromosome are replicated) which initiates G2 phase (pre- mitotic phase), thus preparing the cell for division e.g., energy storage for chromosome movements, mitosis specific proteins, RNA and microtubule subunits (for spindle fibres) synthesise.G2 phase is the second growth phase. It occurs after the synthesis phase in a typical cell cycle. In the G2 phase synthesis of tubulin protein which is the major component of microtubules takes place. The spindle fibres are made of microtubules.
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Animal, plant, prokaryotic and eukaryotic cells are compared through their membranes, cell walls, nuclei and cytoplasmic organelles. The work includes the structures and functions of mitochondria, chloroplasts, ribosomes, endoplasmic reticulum, Golgi apparatus and lysosomes, as well as chromosome organization and the distinction between chromatin and chromosomes.
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