Question 1

Which of the following best describes the role of the centromere during mitosis?

Accepted Answer

It is the region where spindle fibers attach to separate sister chromatids.

Question 2

During which phase of the cell cycle does DNA replication occur, and what is the result of this process?

Accepted Answer

S phase; each chromosome consists of two sister chromatids.

Question 3

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

Accepted Answer

Metaphase

Question 4

Which of the following equations correctly represents the number of chromosomes ($n$) and chromatids ($c$) in a human somatic cell during G2 phase?

Accepted Answer

$n = 46$, $c = 92$

Question 5

What is the primary function of the mitotic spindle during cell division?

Accepted Answer

To separate sister chromatids and move them to opposite poles of the cell.

Question 6

A mutation prevents the formation of the contractile ring in animal cells. Which process will be directly affected?

Accepted Answer

Cytokinesis

Question 7

Which checkpoint in the cell cycle is most critical for determining whether a cell will proceed to divide or enter a non-dividing state?

Accepted Answer

G1 checkpoint

Question 8

Cyclin-dependent kinases (Cdks) are important for cell cycle regulation. Which statement best describes their activity?

Accepted Answer

Cdks are only active when bound to a cyclin.

Question 9

A researcher adds platelet-derived growth factor (PDGF) to a culture of fibroblasts. What is the expected outcome?

Accepted Answer

The fibroblasts will be stimulated to divide.

Question 10

Which of the following best explains why cancer cells can form tumors in culture while normal cells cannot?

Accepted Answer

Cancer cells lack density-dependent inhibition and anchorage dependence.

Question 11

During which stage of mitosis do sister chromatids become individual chromosomes?

Accepted Answer

Anaphase

Question 12

If a cell is observed to have a well-defined nuclear envelope, uncondensed chromatin, and a visible nucleolus, which phase is it most likely in?

Accepted Answer

Interphase

Question 13

Which of the following is a correct sequence of events during the cell cycle?

Accepted Answer

G1 → S → G2 → Mitosis → Cytokinesis

Question 14

A cell is exposed to a drug that prevents microtubule formation. Which process will be directly inhibited?

Accepted Answer

Chromosome movement during mitosis

Question 15

Which of the following best describes the difference between somatic cells and gametes in terms of chromosome number?

Accepted Answer

Somatic cells have two sets of chromosomes; gametes have one set.

Question 16

Which of the following is a real-world example of the importance of cell division in multicellular organisms?

Accepted Answer

Healing a cut on the skin through tissue renewal

Question 17

If a cell fails to pass the G2 checkpoint, which of the following is most likely to occur?

Accepted Answer

The cell will not enter mitosis and may attempt to repair DNA damage.

Question 18

Which of the following best explains why DNA must be replicated before mitosis?

Accepted Answer

To ensure each daughter cell receives an identical set of genetic information

Question 19

A plant cell is observed forming a cell plate during cytokinesis. What is the significance of this structure?

Accepted Answer

It will develop into a new cell wall separating the two daughter cells.

Question 20

Which of the following statements about chromatin and chromosomes is correct?

Accepted Answer

Chromatin condenses to form chromosomes during cell division.

The Cell Cycle: Structure, Function, and Regulation

Study Guide - Practice Questions

Study Guide - Flashcards