Chapter 12 – The Cell Cycle – Homework



The Cell Cycle

1. Describe the characteristics of the three subphases of interphase.

2. Discuss if binary fission in a prokaryotic cell is the same as mitosis in a eukaryotic cell.

3. During prometaphase, the nuclear envelope disappears then it reappears later in telophase.

Where does it go?

4. Speculate on what would happen to a cell that mutates and loses the function of its kinetochore

proteins.

5. Explain why mitosis is/is not the same thing as Cytokinesis.

6. Imagine a cell mutation that allows the cell to ignore anchorage dependency. Speculate on

what might be the results of this mutation.

7. Identify where in the cell cycle the three main checkpoints are located and what determines if

The cell moves past each checkpoint.

8. Chemicals, such as colchicine from the Autumn Crocus plant, are known to disrupt the formation

of spindle fibers. Speculate on what affect this will have on a cell undergoing mitosis.

Identify what ploidy level (N=?) of the cell resulting from this treatment would likely have.

9. Imagine that the enzyme that breaks down cyclin doesn’t work. Explain what might be result

from this situation.

10. Small cuts that open blood vessels and bleed often heal faster than cuts that don’t

bleed (e.g. paper cuts). Use your knowledge of the factors that affect cell division to

speculate on a possible mechanism for why this occurs.

11. Imagine that an radioactive substance causes all cell division to stop in an organism. Speculate on the results.

12. If the control of cell division breaks down for ANY reason, what is the resulting medical

condition called?

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