Question 1

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

Accepted Answer

Sister chromatids separate and move to opposite poles, requiring ATP and contractile proteins.

Question 2

A researcher observes a cell with 46 chromosomes undergoing division. After the process is complete, two daughter cells are produced, each with 46 chromosomes. Which process did the cell most likely undergo?

Accepted Answer

Mitosis

Question 3

Which of the following events is unique to prophase I of meiosis and does NOT occur during prophase of mitosis?

Accepted Answer

Crossing over between homologous chromosomes

Question 4

A patient is diagnosed with a malignant tumor. Which of the following best explains the underlying cause of this abnormal cell division?

Accepted Answer

Mutations caused by carcinogens or viruses leading to loss of cell cycle control

Question 5

Which checkpoint in the cell cycle ensures that the cell is ready to begin mitosis after DNA replication?

Accepted Answer

End of G2 checkpoint

Question 6

During oogenesis in females, why does one daughter cell receive most of the cytoplasm during meiosis I?

Accepted Answer

To provide the secondary oocyte with sufficient resources for early development if fertilized

Question 7

Which of the following statements correctly compares the outcomes of mitosis and meiosis?

Accepted Answer

Mitosis produces two identical diploid cells, while meiosis produces four genetically unique haploid cells.

Question 8

A scientist exposes developing embryos to a chemical that disrupts spindle fiber formation. Which phase of mitosis would be directly affected first?

Accepted Answer

Prophase

Question 9

If a cell fails to complete cytokinesis after mitosis, what is the most likely outcome?

Accepted Answer

The cell will have two nuclei within a single cytoplasm.

Question 10

Which of the following best explains why gametes are haploid after meiosis?

Accepted Answer

There are two successive divisions without an intervening round of DNA replication.

Question 11

A mutation prevents the formation of cyclins in a cell. What is the most likely effect on the cell cycle?

Accepted Answer

The cell will be unable to activate regulatory proteins and may not progress through the cell cycle.

Question 12

Which of the following scenarios best illustrates the influence of environmental factors on cell differentiation during fetal development?

Accepted Answer

A fetus exposed to high levels of alcohol develops fetal alcohol syndrome.

Question 13

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

Accepted Answer

Recombination of parental genes, increasing genetic diversity

Question 14

A cell in metaphase of mitosis is treated with a drug that prevents the splitting of centromeres. What is the most likely immediate effect?

Accepted Answer

Sister chromatids will not separate, and anaphase will not proceed.

Question 15

Which of the following best describes the difference in the timing of meiosis II completion between male and female gamete development?

Accepted Answer

In females, meiosis II is completed only after fertilization.

Question 16

Which of the following is NOT a function of mitosis in the human body?

Accepted Answer

Production of gametes

Question 17

A cell with 46 chromosomes undergoes meiosis. How many chromosomes will each resulting gamete contain?

Accepted Answer

$$23$$

Question 18

Which of the following best explains why sperm cells are smaller and more numerous than egg cells after meiosis?

Accepted Answer

Sperm cells divide symmetrically, producing four equal-sized gametes.

Question 19

Which of the following is a consequence of a failure at the G1 checkpoint in the cell cycle?

Accepted Answer

The cell may replicate damaged DNA, increasing the risk of mutations.

Question 20

A scientist observes a cell with a cleavage furrow forming. Which process is most likely occurring?

Accepted Answer

Cytokinesis

Mitosis, Meiosis, and Cell Reproduction: Structure, Function, and Regulation

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