Question 1

Which of the following best describes the difference between mitosis and binary fission?

Accepted Answer

Mitosis involves the division of a eukaryotic nucleus, while binary fission is the division of a prokaryotic cell.

Question 2

During which phase of the cell cycle does DNA replication occur?

Accepted Answer

S phase

Question 3

Which structure is responsible for organizing the mitotic spindle in animal cells?

Accepted Answer

Centrosome

Question 4

What is the main function of the mitotic spindle during mitosis?

Accepted Answer

To separate sister chromatids and move them to opposite poles

Question 5

Which checkpoint in the cell cycle ensures that all chromosomes are properly attached to the spindle before anaphase begins?

Accepted Answer

M checkpoint

Question 6

If a cell has 24 chromosomes at the start of G1, how many chromosomes will it have after S phase but before mitosis is complete?

Accepted Answer

48

Question 7

Which of the following events occurs during metaphase of mitosis?

Accepted Answer

Chromosomes align at the equator of the cell.

Question 8

A scientist observes a cell with condensed chromosomes aligned at the center and spindle fibers attached to each chromosome. Which phase is this cell in?

Accepted Answer

Metaphase

Question 9

Which of the following best explains why cytokinesis is important for cell division?

Accepted Answer

It ensures the proper separation of the cytoplasmic contents.

Question 10

In plant cells, what structure forms to separate the two daughter cells during cytokinesis?

Accepted Answer

Cell plate

Question 11

Which of the following is a function of tumor suppressor genes?

Accepted Answer

They inhibit cell division when conditions are not favorable.

Question 12

A drug that prevents microtubule depolymerization would most directly affect which stage of mitosis?

Accepted Answer

Anaphase

Question 13

Which of the following best describes the role of proto-oncogenes in normal cells?

Accepted Answer

They stimulate normal cell growth and division.

Question 14

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

Accepted Answer

Telophase

Question 15

If a cell completes mitosis but not cytokinesis, what is the result?

Accepted Answer

A cell with two identical nuclei.

Question 16

Which of the following checkpoints ensures that the genetic material is fully replicated before mitosis?

Accepted Answer

G2 checkpoint

Question 17

What is the main difference between benign and malignant tumors?

Accepted Answer

Malignant tumors can invade other tissues, while benign tumors do not spread.

Question 18

Which of the following best describes the G0 phase of the cell cycle?

Accepted Answer

A non-dividing state where cells exit the cell cycle and perform specialized functions.

Question 19

Which of the following is the correct sequence for the phases of mitosis?

Accepted Answer

Prophase, Metaphase, Anaphase, Telophase

Question 20

Which of the following best explains why the nuclear envelope breaks down during prometaphase?

Accepted Answer

To allow spindle fibers to attach to chromosomes.

The Cell Cycle: Structure, Function, and Regulation

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