Question 1

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

Accepted Answer

It controls the movement of chromosomes by attaching to kinetochores and separating sister chromatids.

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 cyclin-dependent kinases (Cdks) is correct?

Accepted Answer

Cdks must be attached to a cyclin to be active.

Question 5

A cell is observed to have a cleavage furrow forming. What process is occurring, and in what type of cell is this most likely happening?

Accepted Answer

Cytokinesis in an animal cell

Question 6

Which checkpoint is considered the most important for many cells, determining whether the cell will proceed with division?

Accepted Answer

G1 checkpoint

Question 7

What is the primary difference between somatic cells and gametes in terms of chromosome number?

Accepted Answer

Gametes have half as many chromosomes as somatic cells.

Question 8

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

Accepted Answer

They do not respond to the normal regulatory mechanisms that control cell division.

Question 9

In binary fission, which of the following events occurs first?

Accepted Answer

The chromosome replicates, beginning at the origin of replication.

Question 10

A cell is exposed to a chemical that prevents the formation of microtubules. Which stage of mitosis would be directly affected first?

Accepted Answer

Prophase

Question 11

Which of the following is a function of non-kinetochore microtubules during mitosis?

Accepted Answer

They overlap and push against each other, elongating the cell.

Question 12

If a mutation prevents the production of separase, what would be the most immediate effect on mitosis?

Accepted Answer

Sister chromatids would not separate during anaphase.

Question 13

Which of the following equations correctly represents the relationship between the number of chromosomes in somatic cells ($$2n) $$and gametes ($$n) in $$humans?

Accepted Answer

$$2n = 2 	imes n$$

Question 14

A scientist adds platelet-derived growth factor (PDGF) to a culture of fibroblasts. What is the expected result?

Accepted Answer

The fibroblasts will begin to divide in response to the growth factor.

Question 15

Which of the following best describes the function of MPF (maturation-promoting factor) in the cell cycle?

Accepted Answer

It triggers the cell’s passage past the G2 checkpoint into the M phase.

Question 16

A cell is observed to have chromosomes that are decondensing and nuclear envelopes reforming around each set. Which stage is this?

Accepted Answer

Telophase

Question 17

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

Accepted Answer

A wound healing process where cells stop dividing once the wound is closed.

Question 18

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 cycle and enter a nondividing state called G0.

Question 19

Which of the following best explains why eukaryotic chromosomes condense during mitosis?

Accepted Answer

To facilitate the equal distribution of genetic material to daughter cells.

Question 20

A patient is diagnosed with a genetic disorder that affects the function of cohesins. Which stage of mitosis would most likely be disrupted?

Accepted Answer

Anaphase, because sister chromatids would not separate properly.

The Cell Cycle: Mechanisms and Regulation

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