Question 1

Which of the following best describes the role of the mitotic spindle during mitosis?

Accepted Answer

It separates sister chromatids and moves them to opposite poles of the cell.

Question 2

During which phase of the cell cycle does DNA replication occur?

Accepted Answer

S phase

Question 3

A researcher observes a cell with chromosomes aligned at the metaphase plate. Which stage of mitosis is this cell in?

Accepted Answer

Metaphase

Question 4

Which of the following statements about cytokinesis is correct?

Accepted Answer

In animal cells, cytokinesis occurs through the formation of a cleavage furrow by a contractile ring of microfilaments.

Question 5

Which of the following is a key difference between mitosis and meiosis?

Accepted Answer

Mitosis produces genetically identical daughter cells, while meiosis produces genetically diverse gametes.

Question 6

A cell is observed to have condensed chromosomes, a disintegrating nuclear envelope, and spindle fibers attaching to kinetochores. Which stage is this cell in?

Accepted Answer

Prometaphase

Question 7

What is the function of the G1 checkpoint in the cell cycle?

Accepted Answer

To determine whether the cell will proceed with division or enter a nondividing state (G0 phase).

Question 8

Which of the following best explains why cancer cells can divide uncontrollably?

Accepted Answer

They do not require growth factors and can bypass cell cycle checkpoints.

Question 9

A cell with 8 chromosomes undergoes mitosis. How many chromosomes will each daughter cell have after cytokinesis?

Accepted Answer

8

Question 10

Which of the following equations correctly represents the relationship between the number of chromosomes ($$n) in a $$parent cell and its daughter cells after mitosis?

Accepted Answer

$$n_{daughter} = n_{parent}$$

Question 11

Which protein complex is responsible for cleaving cohesins and allowing sister chromatids to separate during anaphase?

Accepted Answer

Separase

Question 12

A scientist treats a culture of animal cells with a drug that prevents microtubule depolymerization. What is the most likely effect on mitosis?

Accepted Answer

Sister chromatids will not separate during anaphase.

Question 13

Which of the following is true regarding binary fission in prokaryotes?

Accepted Answer

It results in two genetically identical daughter cells.

Question 14

Which of the following best describes the role of cyclin-dependent kinases (Cdks) in the cell cycle?

Accepted Answer

They must bind to cyclins to become active and regulate cell cycle progression.

Question 15

A patient is treated with a chemotherapeutic drug that targets rapidly dividing cells. Which normal tissue is most likely to be affected as a side effect?

Accepted Answer

Intestinal lining

Question 16

Which of the following is a real-world example of density-dependent inhibition?

Accepted Answer

A wound healing process where cell division stops once the wound is closed.

Question 17

If a cell does not receive a go-ahead signal at the G1 checkpoint, what is the most likely outcome?

Accepted Answer

The cell will exit the cell cycle and enter the G0 phase.

Question 18

Which of the following best explains why malignant tumors are more dangerous than benign tumors?

Accepted Answer

Malignant tumors can invade surrounding tissues and metastasize to other parts of the body.

Question 19

Which of the following equations best represents the relationship between cyclin concentration ($$[Cyclin]) $$and MPF activity ($$A_{MPF}) $$during the cell cycle?

Accepted Answer

$$A_{MPF} \propto [Cyclin]$$

Question 20

A mutation causes a cell to produce a nonfunctional separase enzyme. What is the most likely consequence for the cell during mitosis?

Accepted Answer

Sister chromatids will fail to separate during anaphase.

The Cell Cycle: Mechanisms and Regulation

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