Question 1

Which of the following best describes the difference between chromatin and chromosomes in eukaryotic cells?

Accepted Answer

Chromatin refers to DNA wrapped around histones in a less condensed state during interphase, while chromosomes are highly condensed structures visible during mitosis.

Question 2

A researcher observes a cell with chromosomes aligned at the center of the cell, attached to spindle fibers from opposite poles. Which stage of mitosis is being observed?

Accepted Answer

Metaphase

Question 3

Which of the following events increases genetic variation during meiosis?

Accepted Answer

Crossing over between homologous chromosomes during prophase I

Question 4

A cell with a diploid number of 8 undergoes meiosis. How many chromosomes will each resulting gamete contain?

Accepted Answer

$$4$$

Question 5

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

Accepted Answer

G1 checkpoint (restriction point)

Question 6

A patient is diagnosed with a tumor that does not invade surrounding tissues or spread to other parts of the body. This tumor is best described as:

Accepted Answer

Benign

Question 7

Which of the following best explains why cancer cells can divide uncontrollably?

Accepted Answer

They ignore cell cycle checkpoints due to mutations in regulatory genes.

Question 8

During which phase of mitosis do sister chromatids separate and move toward opposite poles?

Accepted Answer

Anaphase

Question 9

Which of the following is a direct result of nondisjunction during meiosis?

Accepted Answer

Production of gametes with abnormal numbers of chromosomes (aneuploidy)

Question 10

A cell is observed to have a cleavage furrow forming. What process is most likely occurring?

Accepted Answer

Cytokinesis in an animal cell

Question 11

Which of the following statements about cyclin-dependent kinases (Cdks) is correct?

Accepted Answer

Cdks are active only when bound to cyclin proteins.

Question 12

Which process restores the diploid chromosome number in sexually reproducing organisms?

Accepted Answer

Fertilization

Question 13

A karyotype reveals a human cell with 47 chromosomes, including three copies of chromosome 21. This condition is best described as:

Accepted Answer

Trisomy

Question 14

Which of the following events occurs during prophase I of meiosis but not during prophase of mitosis?

Accepted Answer

Pairing of homologous chromosomes and crossing over

Question 15

If a cell with 12 chromosomes undergoes mitosis, how many chromosomes will each daughter cell have after cytokinesis?

Accepted Answer

$$12$$

Question 16

Which of the following mechanisms does NOT contribute to genetic variation in sexually reproducing organisms?

Accepted Answer

Replication of DNA during S phase

Question 17

A scientist observes a cell that has entered G0 phase. Which of the following best describes this cell?

Accepted Answer

It has exited the cell cycle and is not currently dividing.

Question 18

Which of the following best explains why meiosis is essential for sexual reproduction?

Accepted Answer

It reduces the chromosome number by half, preventing chromosome doubling in each generation.

Question 19

Which of the following is a difference between somatic cells and gametes in humans?

Accepted Answer

Somatic cells are diploid, while gametes are haploid.

Question 20

A plant cell is observed forming a cell plate during cytokinesis. What is the function of the cell plate?

Accepted Answer

To develop into a new cell wall between daughter cells

Cell Division: Mitosis, Meiosis, and Chromosomal Inheritance

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