Question 1

Which phase of the cell cycle is responsible for DNA replication?

Accepted Answer

S phase

Question 2

During which subphase of mitosis do chromosomes align at the center of the cell?

Accepted Answer

Metaphase

Question 3

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

Accepted Answer

Plant cells form a cell plate, while animal cells form a cleavage furrow.

Question 4

Which of the following best describes the function of cell-cycle checkpoints?

Accepted Answer

They allow the cell to decide whether to proceed with division.

Question 5

A mutation causes a cell to bypass the G1 checkpoint. What is a likely consequence?

Accepted Answer

The cell may divide uncontrollably, potentially leading to tumor formation.

Question 6

Which process is responsible for the production of gametes in animals?

Accepted Answer

Meiosis

Question 7

In bacterial cell division, which process is most similar to eukaryotic M phase?

Accepted Answer

Binary fission

Question 8

Which of the following is NOT a subphase of mitosis?

Accepted Answer

Interphase

Question 9

If a cell fails to complete cytokinesis after mitosis, what is the result?

Accepted Answer

One cell with two nuclei

Question 10

Which of the following equations best represents the number of chromosomes in daughter cells after mitosis, if the parent cell has $$n$$ chromosomes?

Accepted Answer

$$n$$

Question 11

A researcher observes a cell with chromosomes lined up in the middle of the cell and spindle fibers attached to each chromosome. Which phase is this cell in?

Accepted Answer

Metaphase

Question 12

Which of the following statements about cancer is TRUE?

Accepted Answer

Cancer arises from cells in which cell-cycle checkpoints have failed.

Question 13

Which event occurs during anaphase of mitosis?

Accepted Answer

Sister chromatids are pulled apart to opposite poles.

Question 14

A cell is observed to have a cell plate forming in the center. What type of cell is this most likely to be?

Accepted Answer

Plant cell during cytokinesis

Question 15

Which of the following best describes the role of protein filaments during bacterial cell division?

Accepted Answer

They attach to replicated chromosomes and pull them apart.

Question 16

If a cell spends 90% of its time in interphase, which of the following is a likely explanation?

Accepted Answer

The cell is performing its functional roles and preparing for division.

Question 17

Which of the following is a critical function of the S phase in the cell cycle?

Accepted Answer

DNA replication

Question 18

A scientist is studying a tumor and finds that the cells have defective regulatory molecules at cell-cycle checkpoints. What is the most likely result?

Accepted Answer

The cells will divide uncontrollably.

Question 19

Which of the following best explains why binary fission is not considered mitosis?

Accepted Answer

Binary fission does not involve the division of a nucleus.

Question 20

If a cell with 8 chromosomes undergoes mitosis, how many chromosomes will each daughter cell have?

Accepted Answer

8

The Cell Cycle: Mechanisms and Regulation

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