Question

a model of the cell cycle is shown here. based on your knowledge of the cell cycle and the percentage of cells in each stage of the cell cycle, evaluate each of the following statements. select three correct options. a 90% of the time the cell is in interphase. b mitosis is the longest phase of the cell cycle. c 10% of the time, the cell is dividing its nucleus and cytoplasm. d the cell spends almost half of its time growing in size and duplicating organelles. e the cell spends 5x more time duplicating the dna compared to dividing the nuclear components.

Explanation:

• Option A:
• Interphase includes \(G_1\), \(S\), and \(G_2\) phases. If \(G_1 = 47\%\), assume \(S = 38\%\) (since \(100 - 47- 15=38\), if \(M = 15\%\)), then interphase (\(G_1+S + G_2\)) is \(47 + 38+5=90\%\) of the cell - cycle time.
• Option C:
• Mitosis (\(M\) phase) is when the cell divides its nucleus and cytoplasm. If interphase is \(90\%\), then \(M\) phase is \(100 - 90=10\%\) of the cell - cycle time.
• Option D:
• \(G_1\) phase is for cell growth and duplicating organelles. \(G_1 = 47\%\), which is almost half (\(50\%\)) of the cell - cycle time.

• Option B:
• Mitosis (\(M\) phase) is the shortest phase, not the longest. Interphase is the longest phase.
• Option E:
• If \(S\) (DNA - duplication) is \(38\%\) and \(M\) (nuclear - division) is \(15\%\), \(\frac{38}{15}\approx2.53

eq5\)

Answer:

A. 90% of the time the cell is in interphase.
C. 10% of the time, the cell is dividing its nucleus and cytoplasm.
D. The cell spends almost half of its time growing in size and duplicating organelles.