Question 1

Which phase of the cell cycle is primarily responsible for DNA replication?

Accepted Answer

S phase

Question 2

During which stage of mitosis do chromosomes align at the center of the cell?

Accepted Answer

Metaphase

Question 3

What is the primary purpose of cell division in single-celled organisms?

Accepted Answer

To reproduce

Question 4

Which equation correctly represents the chromosome number after mitosis in somatic cells?

Accepted Answer

$$2N = 2N + 2N$$

Question 5

A mutation prevents the formation of spindle fibers during mitosis. Which phase would be directly affected?

Accepted Answer

Metaphase

Question 6

Which of the following best describes the function of red blood cells as a result of cell specialization?

Accepted Answer

Carrying oxygen

Question 7

If a cell fails to replicate its DNA during the S phase, what is the most likely consequence during mitosis?

Accepted Answer

Daughter cells will have half the normal DNA content

Question 8

Which phase of mitosis is characterized by the separation of sister chromatids and their movement toward opposite poles?

Accepted Answer

Anaphase

Question 9

In multicellular organisms, why is it important that cells remain small even as the organism grows larger?

Accepted Answer

Small cells maintain efficient transport of materials

Question 10

Which of the following events occurs during telophase of mitosis?

Accepted Answer

Nuclear envelope reforms around chromosome sets

Question 11

A scientist observes a cell with elongated and unwinding chromosomes, visible nucleoli, and a reforming nuclear envelope. Which phase is this cell in?

Accepted Answer

Telophase

Question 12

Which sub-phase of interphase is directly responsible for the synthesis of DNA?

Accepted Answer

S

Question 13

What is the main difference between mitosis and meiosis in terms of chromosome number in daughter cells?

Accepted Answer

Mitosis produces daughter cells identical to the parent cell, while meiosis produces cells with half the chromosome number

Question 14

Which of the following is NOT a reason for cell division in multicellular organisms?

Accepted Answer

Increase in cell size

Question 15

If a cell in G2 phase is exposed to a toxin that prevents DNA repair, what is the most likely outcome?

Accepted Answer

The cell may undergo apoptosis due to DNA damage

Question 16

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

Accepted Answer

They attach sister chromatids together

Question 17

A patient’s cells are observed to have chromosomes that fail to separate during anaphase. What condition might result?

Accepted Answer

Aneuploidy

Question 18

Which of the following is a correct sequence of mitotic phases?

Accepted Answer

Prophase, Metaphase, Anaphase, Telophase

Question 19

Which process is responsible for the division of the cytoplasm following nuclear division?

Accepted Answer

Cytokinesis

Question 20

A cell is observed to have condensed chromatin fibers forming visible chromosomes. Which phase is this most likely?

Accepted Answer

Early Prophase

The Cell Cycle: Structure, Function, and Phases

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