Multiple Choice
If a cell contains 60 chromatids at the start of mitosis, how many chromosomes will be found in each daughter cell at the completion of the cell cycle?
3. Energy & Cell Processes
Review of the Cell Cycle
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Movement of the chromosomes during anaphase would be most affected by a drug that:
a) Prevents the formation of a cleavage furrow.
b) Prevents the formation of the nuclear envelope.
c) Prevents elongation of microtubules.
d) Prevents shortening of microtubules.
A
Prevents the formation of a cleavage furrow.
B
Prevents the formation of the nuclear envelope.
C
Prevents elongation of microtubules.
D
Prevents shortening of microtubules.
Verified step by step guidance1
Understand the role of microtubules during anaphase: Microtubules are part of the mitotic spindle, which is responsible for separating sister chromatids during cell division.
Recognize that during anaphase, microtubules shorten to pull the sister chromatids apart towards opposite poles of the cell.
Consider the effect of a drug that prevents the shortening of microtubules: If microtubules cannot shorten, the chromatids cannot be pulled apart, thus affecting chromosome movement.
Evaluate the other options: Preventing the formation of a cleavage furrow affects cytokinesis, not anaphase. Preventing the formation of the nuclear envelope affects telophase, not anaphase.
Conclude that the most direct impact on chromosome movement during anaphase would be from a drug that prevents the shortening of microtubules, as this process is crucial for chromatid separation.
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