Question 1

Which of the following best describes the primary purpose of the cell cycle in multicellular organisms?

Accepted Answer

To enable cells to grow, develop, and reproduce

Question 2

During which phase of interphase does DNA replication occur, and what is the result?

Accepted Answer

S phase; the cell duplicates its chromosomes

Question 3

A researcher observes a cell with duplicated chromosomes aligned at the center of the cell. Which stage of mitosis is this cell most likely in?

Accepted Answer

Metaphase

Question 4

Which checkpoint ensures that all chromosomes are properly attached to spindle fibers before the cell proceeds to anaphase?

Accepted Answer

M checkpoint

Question 5

If a cell fails to accumulate enough resources and cellular materials, which phase of the cell cycle is most likely affected?

Accepted Answer

G$$_2$$ phase

Question 6

Which of the following external factors can regulate the cell cycle?

Accepted Answer

Presence or absence of essential nutrients

Question 7

A mutation causes a cell to bypass the G$$_1$$ checkpoint even when DNA is damaged. What is a likely consequence?

Accepted Answer

The cell may divide with damaged DNA, increasing cancer risk

Question 8

Which process is responsible for dividing the cytoplasm after nuclear division?

Accepted Answer

Cytokinesis

Question 9

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

Accepted Answer

Anaphase

Question 10

Which of the following is NOT a function of the cell cycle checkpoints?

Accepted Answer

Allowing uncontrolled cell proliferation

Question 11

A cell in G$$_1$$ phase has 4 chromosomes. After S phase, how many chromatids will be present?

Accepted Answer

8

Question 12

Which of the following best explains why loss of cell cycle control can result in cancer?

Accepted Answer

Cells divide uncontrollably, forming tumors

Question 13

Which phase of the cell cycle is characterized by the cell performing its normal functions and transcribing DNA to produce proteins?

Accepted Answer

G$$_1$$ phase

Question 14

What is the role of cyclins and kinases in cell cycle regulation?

Accepted Answer

They regulate progression through cell cycle checkpoints

Question 15

Which of the following scenarios best illustrates anchorage dependence as an external regulator of the cell cycle?

Accepted Answer

A cell divides only when attached to a substrate

Question 16

If cytokinesis does not occur after mitosis, what is the result?

Accepted Answer

A cell with two nuclei

Question 17

Which of the following is a direct result of the loss of cell cycle regulation in somatic cells?

Accepted Answer

Uncontrolled cell proliferation

Question 18

A scientist treats cells with a drug that prevents spindle fibers from attaching to chromosomes. Which checkpoint will prevent the cell from proceeding?

Accepted Answer

M checkpoint

Question 19

Which stage of mitosis is characterized by the reformation of the nuclear envelope and the decondensation of chromosomes?

Accepted Answer

Telophase

Question 20

Which of the following best describes the relationship between cell size and the number of cells in an organism?

Accepted Answer

The number of cells can vary from 1 to trillions depending on the organism

The Cell Cycle: Structure, Phases, and Regulation

Study Guide - Practice Questions

Study Guide - Flashcards