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

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

Accepted Answer

Metaphase

Question 3

Which checkpoint in the cell cycle is considered the 'restriction point' and is most critical for determining whether a cell will divide?

Accepted Answer

$$G_1$$ checkpoint

Question 4

What is the primary difference between cytokinesis in plant cells and animal cells?

Accepted Answer

Animal cells form a cleavage furrow, while plant cells form a cell plate.

Question 5

Which of the following statements about cyclin-dependent kinases (Cdks) is correct?

Accepted Answer

Cdks are active only when bound to cyclin.

Question 6

A cell is exposed to a drug that prevents microtubule depolymerization. What is the most likely effect on mitosis?

Accepted Answer

Sister chromatids will not separate during anaphase.

Question 7

Which of the following best explains why cancer cells can form tumors?

Accepted Answer

They escape normal cell cycle controls and divide uncontrollably.

Question 8

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

Accepted Answer

$$S$$ phase

Question 9

A mutation causes a cell to bypass the $$M$$ checkpoint. What is a likely consequence?

Accepted Answer

Chromosomes may not be properly attached to the spindle, leading to aneuploidy.

Question 10

Which of the following is a function of cell division in multicellular organisms?

Accepted Answer

Growth, development, and tissue renewal

Question 11

Which of the following best describes the difference between somatic cells and gametes in terms of chromosome number?

Accepted Answer

Somatic cells have two sets of chromosomes; gametes have one set.

Question 12

Which experiment provided evidence that cytoplasmic signals regulate the cell cycle?

Accepted Answer

Fusing cells at different cell cycle phases and observing synchronized nuclear events

Question 13

Which of the following is true about binary fission in bacteria?

Accepted Answer

The chromosome replicates and the cell divides into two identical cells.

Question 14

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 15

Which of the following best explains why density-dependent inhibition is important for normal tissue function?

Accepted Answer

It prevents overcrowding by stopping cell division when optimal density is reached.

Question 16

Which molecular complex triggers a cell’s passage past the $$G_2$$ checkpoint into $$M$$ phase?

Accepted Answer

MPF (Maturation-Promoting Factor)

Question 17

If a cell receives a stop signal at the $$G_1$$ checkpoint, what is its likely fate?

Accepted Answer

It will exit the cell cycle and enter $$G_0$$ phase.

Question 18

Which of the following is a direct result of the enzyme separase activity during mitosis?

Accepted Answer

Cleavage of cohesins, allowing sister chromatids to separate

Question 19

A scientist observes that a certain cell type does not require anchorage to divide and continues to proliferate even when crowded. What is the most likely explanation?

Accepted Answer

The cells are cancerous and have lost normal cell cycle regulation.

Question 20

Which of the following best describes the relationship between cyclin concentration and MPF activity during the cell cycle?

Accepted Answer

MPF activity peaks when cyclin concentration peaks.

The Cell Cycle: Structure, Function, and Regulation

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