Question 1

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

Accepted Answer

To enable growth, development, and tissue repair by producing new somatic cells

Question 2

During which phase of the cell cycle does DNA replication occur, and what is the state of the chromosomes during this phase?

Accepted Answer

S phase; chromosomes are in a relaxed chromatin state

Question 3

A scientist observes a cell with two identical DNA molecules joined at a centromere. What are these structures called, and what is their relationship?

Accepted Answer

Sister chromatids; they are identical copies resulting from DNA replication

Question 4

Which of the following best describes the difference between somatic cells and gametes in humans?

Accepted Answer

Somatic cells contain two sets of chromosomes, while gametes contain one set

Question 5

Which of the following events occurs during prophase of mitosis?

Accepted Answer

Chromosomes condense and the mitotic spindle begins to form

Question 6

What is the function of the kinetochore during mitosis?

Accepted Answer

It attaches chromosomes to spindle microtubules, allowing their movement

Question 7

In animal cells, which cytoskeletal component is primarily responsible for the formation of the cleavage furrow during cytokinesis?

Accepted Answer

Actin filaments

Question 8

A plant cell is observed forming a cell plate during cytokinesis. Which organelles and cytoskeletal elements are directly involved in this process?

Accepted Answer

Golgi-derived vesicles and microtubules

Question 9

Which of the following best describes binary fission in prokaryotes?

Accepted Answer

A form of asexual reproduction where the cell duplicates its DNA and divides into two genetically identical cells

Question 10

A cell is observed to have passed the G1 checkpoint but fails to pass the G2 checkpoint. What is the most likely consequence for this cell?

Accepted Answer

It will remain in G2 phase and not proceed to mitosis

Question 11

Which of the following scenarios best illustrates the loss of cell cycle control in cancer cells?

Accepted Answer

A cell that divides uncontrollably, bypassing cell cycle checkpoints

Question 12

If a cell receives a signal to enter the G0 phase, what does this indicate about its progression through the cell cycle?

Accepted Answer

The cell will temporarily or permanently exit the cell cycle and stop dividing

Question 13

A researcher is studying a cell in which chromosomes are aligned at the center of the cell, attached to spindle fibers from opposite poles. Which phase of mitosis is being observed?

Accepted Answer

Metaphase

Question 14

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

Accepted Answer

$$n = 46,\ c = 92$$

Question 15

Which of the following best explains why homologous chromosomes are not identical?

Accepted Answer

They carry the same genes but may have different alleles inherited from each parent

Question 16

A mutation causes a cell to skip the M checkpoint. What is a likely outcome of this mutation?

Accepted Answer

The cell may distribute chromosomes unevenly, leading to aneuploidy

Question 17

During which phase of the cell cycle are chromosomes most highly condensed and visible under a light microscope?

Accepted Answer

M phase (mitosis)

Question 18

Which of the following best describes the formation of the metaphase plate during mitosis?

Accepted Answer

Chromosomes align at the cell's equatorial plane due to tension from spindle fibers

Question 19

A patient is diagnosed with a tumor in which cells have lost the ability to respond to external growth signals and do not undergo apoptosis. Which cell cycle concept is most directly related to this pathology?

Accepted Answer

Proper function of the G1, G2, and M checkpoints

Question 20

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

Accepted Answer

G1 → S → G2 → M

Chapter 12 Study Guide: The Cell Cycle

Study Guide - Practice Questions

Study Guide - Flashcards