Question 1

Which of the following best describes the role of cell division in multicellular organisms?

Accepted Answer

It is responsible for reproduction, growth and development, and tissue renewal.

Question 2

A human somatic cell contains 46 chromosomes. After mitosis and cytokinesis, how many chromosomes will each daughter cell have?

Accepted Answer

46

Question 3

Which of the following statements correctly distinguishes between somatic cells and gametes in humans?

Accepted Answer

Somatic cells are diploid (2n), while gametes are haploid (n).

Question 4

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

Accepted Answer

S phase

Question 5

What is the function of cohesin proteins during mitosis?

Accepted Answer

They hold sister chromatids together until anaphase.

Question 6

Which of the following best describes the difference between mitosis and cytokinesis?

Accepted Answer

Mitosis divides the nucleus, while cytokinesis divides the cytoplasm.

Question 7

If a cell fails to pass the G1 checkpoint, what is the most likely outcome?

Accepted Answer

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

Question 8

Which structure is responsible for organizing the mitotic spindle in animal cells?

Accepted Answer

Centrosome

Question 9

What is the main function of the M checkpoint during the cell cycle?

Accepted Answer

To verify that all chromosomes are properly attached to the spindle before anaphase.

Question 10

Which of the following events occurs during anaphase of mitosis?

Accepted Answer

Sister chromatids are separated and pulled toward opposite poles.

Question 11

A cell with a diploid number of 18 undergoes mitosis. How many chromosomes will each daughter cell have after cytokinesis?

Accepted Answer

18

Question 12

Which of the following best describes the role of nonkinetochore microtubules during mitosis?

Accepted Answer

They elongate the cell during anaphase.

Question 13

Which phase of mitosis is characterized by the alignment of chromosomes along the metaphase plate?

Accepted Answer

Metaphase

Question 14

What is the molecular composition of the cleavage furrow in animal cells?

Accepted Answer

Actin microfilaments and myosin molecules

Question 15

Which of the following equations correctly represents the chromosome number in human gametes and somatic cells?

Accepted Answer

$$n = 23 in $$gametes, $$2n = 46 in $$somatic cells

Question 16

A mutation prevents the activation of separase during mitosis. What is the most likely consequence for the cell?

Accepted Answer

Sister chromatids will not separate during anaphase.

Question 17

Which of the following best explains why the G1 checkpoint is called the 'restriction point' in mammalian cells?

Accepted Answer

It is the most important checkpoint, determining whether the cell will proceed with division.

Question 18

Which of the following is true regarding the genetic identity of daughter cells produced by mitosis?

Accepted Answer

They are genetically identical to each other and to the parent cell.

Question 19

A researcher observes a cell with condensed chromosomes aligned at the center of the cell, spindle fibers attached to kinetochores, and no nuclear envelope. Which stage of mitosis is this cell in?

Accepted Answer

Metaphase

Question 20

Which of the following best describes the fate of a chromosome during the cell cycle, starting from G1 through mitosis?

Accepted Answer

It is duplicated during S phase, forming two sister chromatids, which are separated during mitosis.

The Cell Cycle: Mechanisms and Regulation

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