Q: Which equation best represents the relationship between the number of chromosomes in somatic cells and gametes in humans?

$$n_{somatic} = 2 \times n_{gamete}$$

Question 1

Which of the following best describes the primary function of cell division in multicellular eukaryotes?

Accepted Answer

To allow growth, development, and repair of tissues

Question 2

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

Accepted Answer

S phase

Question 3

A cell is observed with condensed chromosomes aligned at the metaphase plate, spindle fibers attached to kinetochores, and centrosomes at opposite poles. Which stage of mitosis is this cell in?

Accepted Answer

Metaphase

Question 4

What is the role of the enzyme separase during mitosis?

Accepted Answer

It cleaves cohesin proteins, allowing sister chromatids to separate

Question 5

Which of the following statements about cytokinesis is correct?

Accepted Answer

In animal cells, cytokinesis involves the formation of a cleavage furrow

Question 6

A researcher marks a region of a kinetochore microtubule between the spindle pole and the chromosome. As chromosomes move poleward during anaphase, which observation supports the 'Pac-man' mechanism?

Accepted Answer

The marked region shortens at the kinetochore end

Question 7

Which checkpoint in the cell cycle is most critical for determining whether a cell will proceed to divide?

Accepted Answer

G1 checkpoint

Question 8

What is the function of cyclin-dependent kinases (Cdks) in the cell cycle?

Accepted Answer

They phosphorylate target proteins to regulate cell cycle progression

Question 9

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

Accepted Answer

The cell will proceed through S, G2, and M phases and divide

Question 10

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

Accepted Answer

Fibroblasts in culture stopping division when they form a single layer

Question 11

Which equation best represents the relationship between the number of chromosomes in somatic cells and gametes in humans?

Accepted Answer

$$n_{somatic} = 2 	imes n_{gamete}$$

Question 12

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

Accepted Answer

They escape normal cell cycle controls and divide uncontrollably

Question 13

Binary fission in bacteria differs from mitosis in eukaryotes in which key way?

Accepted Answer

Binary fission does not involve chromosome condensation

Question 14

A cell is exposed to a chemotherapeutic drug that targets the cell cycle. Which normal cells are most likely to be affected by this treatment?

Accepted Answer

Cells in the bone marrow

Question 15

Which of the following is NOT a function of the mitotic spindle?

Accepted Answer

Condensing chromatin into chromosomes

Question 16

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 stop at the M checkpoint until the error is corrected

Question 17

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

Accepted Answer

MPF activity peaks when cyclin concentration is highest

Question 18

Which of the following is a direct result of the loss of cell cycle controls in cancer cells?

Accepted Answer

Cells divide indefinitely and may form tumors

Question 19

Which phase of mitosis is characterized by the reformation of the nuclear envelope and the appearance of nucleoli?

Accepted Answer

Telophase

Question 20

A cell is observed to have two sets of chromosomes, each set located at opposite poles of the cell, and the cytoplasm is beginning to divide. Which stage is this cell most likely in?

Accepted Answer

Telophase and cytokinesis

The Cell Cycle: Structure, Function, and Regulation

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