A.) Describe the three components of the eukaryotic cytoskeleton (You may have t

Question

A.) Describe the three components of the eukaryotic cytoskeleton (You may have to review previous chapters for this question)

B.) Explain the purpose of microtubules in mitosis (polar, aster, kinetochore)

C.) List the stages of the cell cycle.

D.) Where are the check points in the cell cycle?

E.) What makes a cell cancerous?

F.) In which part of the cell cycle does a cell spend most of its time

G.) When is the DNA replicated?

H.) Explain how MPF is activated and deactivated

I.) Explain how CDK can remain at a constant level inside the cell when it is responsible for initiating mitosis

Explanation / Answer

Answer:

QA). Three components of eukaryotic cytoskeleton are intermediate filaments, microtubules and microfilaments

QB). Microtubule develop into spindle fibers during cell division, they split the chromosomes longitudinally during anaphase and yields into two chromosomes

QC). 1. Interphase (G1, S and G2 phase) & M-phase (prophase, metaphase, anaphase & telophase)

QD).

Checkpoint one is in G1 phase. Here DNA is checked to make sure there are not any mistakes in it before it is replicated in S phase.

Checkpoint 2 is at the beginning G2 phase. The purpose is to recheck the DNA that was just replicated, making sure there are not any new mistakes.

Checkpoint 3 is during M phase. This checkpoint is to make sure all of the chromosomes are lined up in the center of the cell. The cell will not enter Anaphase until ALL of the chromosome are lined up perfectly in the middle.

QE).

If any damaged DNA of cell is allowed in cell division, it would be arrested at any of the cell cycle check points. If it is not arrested and proceded to cell division, the damaged cells divide continuosly and form a mass of cells, which leads to cancer.

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