Question 1

Which of the following best describes the primary function of mitosis in multicellular eukaryotes?

Accepted Answer

To enable growth, development, and repair by producing genetically identical daughter cells

Question 2

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

Accepted Answer

S phase; each chromosome consists of two identical sister chromatids

Question 3

A scientist observes a cell with chromosomes aligned at the center of the cell, attached to spindle fibers. Which stage of mitosis is this cell in?

Accepted Answer

Metaphase

Question 4

Which checkpoint in the eukaryotic cell cycle ensures that DNA has been properly replicated before the cell enters mitosis?

Accepted Answer

G2 checkpoint

Question 5

If a mutation prevents the production of cyclins in a cell, what is the most likely consequence?

Accepted Answer

The cell cycle will halt at specific checkpoints, preventing division

Question 6

Which of the following statements about apoptosis is correct?

Accepted Answer

Apoptosis is programmed cell death that prevents the propagation of damaged cells

Question 7

A human somatic cell contains 46 chromosomes. What is the haploid number $$(n)$$ for humans, and what does this represent?

Accepted Answer

$$n = 23$$; the number of chromosomes in a gamete

Question 8

Which of the following best explains why nerve and muscle cells typically remain in the G0 phase?

Accepted Answer

They do not divide after differentiation and perform specialized functions

Question 9

What is the role of histone proteins in eukaryotic chromosomes?

Accepted Answer

They provide structural support by allowing DNA to coil and condense into chromatin

Question 10

A researcher is studying a rapidly dividing bacterial culture. Which process is responsible for the division of these prokaryotic cells?

Accepted Answer

Binary fission

Question 11

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

Accepted Answer

Anaphase

Question 12

Which of the following events occurs during telophase of mitosis?

Accepted Answer

A new nuclear envelope forms around each set of chromosomes

Question 13

A cell is observed to have a cleavage furrow forming. What process is this cell undergoing, and what is the result?

Accepted Answer

Cytokinesis; the cytoplasm is dividing to form two genetically identical daughter cells

Question 14

Which of the following best describes the difference between diploid $$(2n)$$ and haploid $$(n)$$ cells in humans?

Accepted Answer

Diploid cells have two sets of chromosomes, one from each parent; haploid cells have one set

Question 15

Which of the following is a key difference between mitosis in eukaryotes and binary fission in prokaryotes?

Accepted Answer

Mitosis involves the division of a nucleus, while binary fission does not

Question 16

A cell fails to pass the M checkpoint during mitosis. What is the most likely reason for this failure?

Accepted Answer

The chromosomes are not properly aligned at the metaphase plate

Question 17

Which of the following real-life scenarios best illustrates the importance of mitosis in humans?

Accepted Answer

A person recovering from a skin wound as new skin cells replace damaged ones

Question 18

Which of the following equations correctly represents the relationship between diploid and haploid chromosome numbers in humans?

Accepted Answer

$$2n = 46$$, $$n = 23$$

Question 19

Which of the following best explains why apoptosis is beneficial for multicellular organisms?

Accepted Answer

It allows damaged or abnormal cells to self-destruct, preventing the spread of errors

Question 20

A plant cell is observed to be increasing in size, duplicating organelles, and accumulating materials for DNA synthesis. Which phase of the cell cycle is it most likely in?

Accepted Answer

G1 phase

The Cell Cycle and Cellular Division: Mitosis and Binary Fission

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