Question 1

Which of the following best describes what occurs during the metaphase of mitosis?

Accepted Answer

Duplicated chromosomes align across the center of the cell and attach to the mitotic spindle.

Question 2

During which phase of the cell cycle is DNA replicated, and what is the significance of this process?

Accepted Answer

S phase; it ensures that each daughter cell receives an identical set of chromosomes.

Question 3

Which of the following is a key difference between mitosis and meiosis?

Accepted Answer

Mitosis produces diploid cells, while meiosis produces haploid cells.

Question 4

A mutation in a gene controlling the G1 checkpoint leads to uncontrolled cell division. What is a likely consequence of this mutation?

Accepted Answer

The cell may become cancerous due to loss of cell cycle regulation.

Question 5

Which process is responsible for genetic variation during meiosis, and in which phase does it occur?

Accepted Answer

Crossing over during prophase I.

Question 6

Why are the daughter cells produced by meiosis genetically different from each other and from the parent cell?

Accepted Answer

Because of crossing over and independent assortment of chromosomes.

Question 7

Which of the following best explains why chemotherapy is used as a treatment for cancer?

Accepted Answer

It targets and destroys rapidly dividing cells, including cancer cells.

Question 8

In human females, what is the fate of the polar bodies formed during oogenesis?

Accepted Answer

They usually degenerate and do not contribute to fertilization.

Question 9

Which checkpoint in the cell cycle ensures that all chromosomes are properly attached to the spindle before proceeding with division?

Accepted Answer

M checkpoint

Question 10

A scientist exposes developing embryos to a chemical that disrupts the mitotic spindle. What is the most likely effect on the cells?

Accepted Answer

Cells will be unable to separate sister chromatids during mitosis.

Question 11

Which of the following environmental factors is most likely to cause abnormal fetal development if exposure occurs during early pregnancy?

Accepted Answer

Alcohol

Question 12

What is the primary function of cyclins in the regulation of the cell cycle?

Accepted Answer

They activate regulatory proteins to initiate specific events in the cell cycle.

Question 13

Which of the following best describes the difference in gamete production between males and females?

Accepted Answer

Males produce four equal-sized sperm, while females produce one large egg and smaller polar bodies.

Question 14

A cell with 46 chromosomes undergoes mitosis. How many chromosomes will each daughter cell have after cytokinesis?

Accepted Answer

$$46$$

Question 15

Which of the following events occurs during anaphase of mitosis?

Accepted Answer

Sister chromatids are pulled apart to opposite poles of the cell.

Question 16

Why is the completion of meiosis II in human females delayed until fertilization?

Accepted Answer

To ensure that the egg only completes division if fertilization occurs.

Question 17

Which of the following best explains why red blood cells must be constantly produced in the bone marrow?

Accepted Answer

They have a short lifespan and are constantly worn away.

Question 18

Which of the following is a direct result of the process of crossing over during meiosis?

Accepted Answer

Increased genetic diversity among gametes.

Question 19

A cell is exposed to a carcinogen that causes a mutation in a gene regulating cell division. What is the most likely long-term outcome if the mutation is not repaired?

Accepted Answer

The cell may undergo uncontrolled division, leading to cancer.

Question 20

Which of the following best describes the role of environmental factors in cell differentiation during early development?

Accepted Answer

They influence which genes are expressed, leading to different cell types.

Cell Division: Mitosis, Meiosis, and Regulation in Eukaryotic Cells

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