Question 1

Which of the following best describes the main purpose of the cell cycle in eukaryotic cells?

Accepted Answer

To allow cells to grow, replicate their DNA, and divide to produce genetically identical daughter cells.

Question 2

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

Accepted Answer

S phase (Synthesis phase)

Question 3

A nerve cell in the adult human body is most likely to be found in which phase of the cell cycle?

Accepted Answer

G0 phase

Question 4

Which checkpoint ensures that DNA has been properly replicated before the cell enters mitosis?

Accepted Answer

G2 checkpoint

Question 5

What is the role of cyclins in the cell cycle?

Accepted Answer

They are internal signaling proteins that regulate progression through the cell cycle by increasing or decreasing at specific checkpoints.

Question 6

If a cell detects irreparable DNA damage at the G1 checkpoint, what is the most likely outcome?

Accepted Answer

The cell will undergo apoptosis (programmed cell death).

Question 7

Which of the following correctly matches the mitotic phase with its main event?

Accepted Answer

Metaphase: Chromosomes align at the center of the cell.

Question 8

In humans, what is the diploid number ($$2n) $$and haploid number ($$n) of $$chromosomes, respectively?

Accepted Answer

$$2n = 46$$, $$n = 23$$

Question 9

Which structure is responsible for holding sister chromatids together until they are separated during mitosis?

Accepted Answer

Centromere

Question 10

A researcher observes a cell with chromosomes lined up along the metaphase plate, spindle fibers attached, and the nuclear envelope dissolved. Which phase is this cell in?

Accepted Answer

Metaphase

Question 11

Which of the following is a key difference between mitosis in eukaryotes and binary fission in prokaryotes?

Accepted Answer

Mitosis involves division of a membrane-bound nucleus, while binary fission does not.

Question 12

Which of the following best explains why mitosis is essential for multicellular organisms?

Accepted Answer

It allows for growth, development, and repair by producing genetically identical cells.

Question 13

What is the function of the mitotic spindle during mitosis?

Accepted Answer

To separate sister chromatids and ensure each daughter cell receives the correct number of chromosomes.

Question 14

Which of the following events occurs during telophase of mitosis?

Accepted Answer

The nuclear envelope reforms around the separated chromosomes.

Question 15

A mutation causes a cell to bypass the M checkpoint, resulting in improper chromosome alignment. What is a likely consequence?

Accepted Answer

Daughter cells with abnormal numbers of chromosomes (aneuploidy).

Question 16

Which of the following best describes chromatin?

Accepted Answer

DNA double helix combined with structural proteins (histones).

Question 17

In which phase of mitosis do the centromeres dissolve and sister chromatids become daughter chromosomes?

Accepted Answer

Anaphase

Question 18

Which of the following is true regarding the chromosome number in different species?

Accepted Answer

Each species has a characteristic chromosome number, which does not necessarily correlate with organism size or complexity.

Question 19

Which process is responsible for the physical division of the cytoplasm into two daughter cells?

Accepted Answer

Cytokinesis

Question 20

A scientist observes a rapidly dividing population of E. coli in a laboratory. Which process is responsible for their reproduction?

Accepted Answer

Binary fission

The Cell Cycle and Mitosis: Structure, Function, and Comparison with Prokaryotic Division

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