Question 1

Which of the following best describes the structure of a eukaryotic chromosome during the S phase of the cell cycle?

Accepted Answer

It consists of two identical sister chromatids joined at a centromere.

Question 2

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

Accepted Answer

S phase; each chromosome is duplicated to form two sister chromatids.

Question 3

Which of the following correctly matches the mitotic stage with its major event?

Accepted Answer

Anaphase: Sister chromatids separate and move toward opposite poles.

Question 4

A scientist observes a cell with a clearly visible cleavage furrow. Which process and cell type is most likely being observed?

Accepted Answer

Cytokinesis in an animal cell

Question 5

Which of the following best explains why neurons and muscle cells are often found in the G0 phase?

Accepted Answer

They have exited the cell cycle and do not regularly divide.

Question 6

Which of the following statements about the relationship between genes, DNA, and chromosomes is correct?

Accepted Answer

Genes are segments of DNA located on chromosomes.

Question 7

What is the primary function of mitosis in multicellular organisms?

Accepted Answer

To produce genetically identical cells for growth and repair

Question 8

Which of the following structures is responsible for organizing spindle fibers during mitosis in animal cells?

Accepted Answer

Centrosome

Question 9

How does cytokinesis differ between plant and animal cells?

Accepted Answer

Animal cells form a cleavage furrow, while plant cells build a cell plate.

Question 10

A researcher treats cells with a drug that prevents microtubule formation. Which stage of mitosis would be most directly affected?

Accepted Answer

Metaphase, because spindle fibers cannot align chromosomes at the metaphase plate.

Question 11

Which of the following is the correct order of the stages of mitosis?

Accepted Answer

Prophase, Metaphase, Anaphase, Telophase

Question 12

Which of the following best describes a nucleosome?

Accepted Answer

A segment of DNA wrapped around a core of histone proteins

Question 13

If a mutation prevents the formation of centromeres, what would most likely happen during mitosis?

Accepted Answer

Sister chromatids would not be properly separated during anaphase.

Question 14

Which of the following is a key difference between mitosis and asexual reproduction in unicellular organisms?

Accepted Answer

Mitosis is a process within multicellular organisms, while asexual reproduction produces new individuals in unicellular organisms.

Question 15

A cell is observed with chromosomes aligned at the center of the cell, but not yet separated. Which stage is this?

Accepted Answer

Metaphase

Question 16

Which of the following best describes the role of histone proteins in chromosome structure?

Accepted Answer

They help package DNA into compact, organized structures called nucleosomes.

Question 17

A plant cell is observed forming a new structure between two nuclei at the end of mitosis. What is this structure called, and what is its function?

Accepted Answer

Cell plate; it develops into a new cell wall separating the daughter cells.

Question 18

Which of the following events occurs during prophase of mitosis?

Accepted Answer

Chromosomes condense and spindle fibers begin to form.

Question 19

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

Accepted Answer

A single cell with two nuclei

Question 20

Which of the following best describes the function of spindle fibers during mitosis?

Accepted Answer

They attach to chromosomes and help separate sister chromatids.

Mod 9 Study Guidance for Mitosis and Cytokinesis Objectives

Study Guide - Practice Questions