Q: Which of the following equations represents the relationship between cyclin concentration and MPF activity during the cell cycle?

$$\text{MPF activity} \propto \text{Cyclin concentration}$$

Question 1

Which phase of the cell cycle is primarily responsible for the duplication of DNA, and what is the main event that occurs during this phase?

Accepted Answer

S phase; DNA synthesis

Question 2

During mitosis, what structure is responsible for moving chromosomes to opposite poles of the cell?

Accepted Answer

Mitotic spindle

Question 3

A cell receives a go-ahead signal at the G1 checkpoint. What is the most likely outcome?

Accepted Answer

The cell will complete S, G2, and M phases and divide

Question 4

Which of the following best describes the relationship between cyclins and cyclin-dependent kinases (Cdks) in cell cycle regulation?

Accepted Answer

Cdks must be attached to a cyclin to be active

Question 5

What is the primary function of the cleavage furrow during cytokinesis in animal cells?

Accepted Answer

To divide the cytoplasm and produce two daughter cells

Question 6

If a cell fails to properly attach all chromosomes to the spindle at the metaphase plate, what is the most likely consequence?

Accepted Answer

The cell will not begin anaphase until all chromosomes are properly attached

Question 7

Which equation best represents the number of chromosomes in daughter cells after mitosis, assuming the parent cell has $$n$$ chromosomes?

Accepted Answer

$$n$$

Question 8

In prokaryotic cells, which process is used for cell division, and what is a key step in this process?

Accepted Answer

Binary fission; plasma membrane pinches inward

Question 9

Which checkpoint in the cell cycle ensures that DNA has been properly replicated before mitosis begins?

Accepted Answer

G2 checkpoint

Question 10

Cancer cells often escape the usual controls on the cell cycle. Which of the following is a direct consequence of this escape?

Accepted Answer

Cancer cells divide uncontrollably

Question 11

During which stage of mitosis do chromosomes align at the metaphase plate?

Accepted Answer

Metaphase

Question 12

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

Accepted Answer

MPF is a cyclin-Cdk complex that triggers passage through the G2 checkpoint

Question 13

A scientist observes a cell with condensed chromosomes, a spindle forming, and the nuclear envelope breaking down. Which stage of mitosis is this cell most likely in?

Accepted Answer

Prometaphase

Question 14

Which of the following is NOT a function of mitosis in multicellular organisms?

Accepted Answer

Production of gametes

Question 15

What is the main difference between somatic cells and gametes regarding chromosome number?

Accepted Answer

Somatic cells are diploid, gametes are haploid

Question 16

Which of the following best explains why daughter cells produced by mitosis are genetically identical to the parent cell?

Accepted Answer

DNA is precisely duplicated during interphase before mitosis

Question 17

A cell is observed to have a contractile ring of microfilaments forming at its equator. What process is this cell undergoing?

Accepted Answer

Cytokinesis in an animal cell

Question 18

Which of the following equations represents the relationship between cyclin concentration and MPF activity during the cell cycle?

Accepted Answer

$$	ext{MPF activity} \propto 	ext{Cyclin concentration}$$

Question 19

Which of the following is a real-world example of a process that relies on mitosis?

Accepted Answer

Healing of a skin wound

Question 20

A mutation causes a cell to skip the G2 checkpoint. Which of the following is a likely consequence?

Accepted Answer

The cell may enter mitosis with damaged or unreplicated DNA

The Cell Cycle: Structure, Function, and Regulation

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