Question 1

Which of the following best describes a key difference between prokaryotic and eukaryotic cells?

Accepted Answer

Eukaryotic cells have a nucleus containing genetic material, while prokaryotic cells lack a nucleus.

Question 2

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

Accepted Answer

S phase

Question 3

Which of the following events occurs during the G2 phase of interphase?

Accepted Answer

The cell checks the integrity of the DNA before mitosis.

Question 4

What is the primary function of meiosis in multicellular organisms?

Accepted Answer

To reduce the chromosome number by half in gametes.

Question 5

A mutation prevents the formation of cohesin during interphase. Which process would be most directly affected?

Accepted Answer

Segregation of chromosomes during mitosis

Question 6

Which equation best represents the reduction of chromosome number during meiosis?

Accepted Answer

$$2n \rightarrow n$$

Question 7

If a eukaryotic cell fails to complete the S phase, what is the most likely consequence?

Accepted Answer

The cell will not have enough DNA for two daughter cells.

Question 8

Which of the following is NOT a characteristic of prokaryotic cells?

Accepted Answer

Presence of membrane-bound organelles

Question 9

A scientist observes a cell with a distinct nucleus and several types of organelles. This cell is most likely:

Accepted Answer

A eukaryotic cell

Question 10

Which phase of the cell cycle is most variable in duration among different cell types?

Accepted Answer

G1 phase

Question 11

Which process ensures that each daughter cell receives an identical set of chromosomes during cell division?

Accepted Answer

Segregation of chromosomes

Question 12

Which of the following best explains why gametes have half the chromosome number of somatic cells?

Accepted Answer

Meiosis involves two successive divisions after one DNA replication.

Question 13

A patient has a genetic disorder where cells cannot progress past the G2 phase. Which cellular process is most directly impaired?

Accepted Answer

Entry into mitosis

Question 14

Which of the following is a real-world consequence of errors during chromosome segregation?

Accepted Answer

Aneuploidy, such as Down syndrome

Question 15

Which of the following best describes the role of the nucleus in eukaryotic cells?

Accepted Answer

It contains the genetic material and directs cellular activities.

Question 16

Which of the following equations correctly represents the DNA content change during the S phase?

Accepted Answer

$$C \rightarrow 2C$$

Question 17

Which phase of the cell cycle is primarily responsible for cell growth and synthesis of proteins?

Accepted Answer

G1 phase

Question 18

If a mutation causes a cell to skip the G2 phase, what is the most likely outcome?

Accepted Answer

The cell may enter mitosis with damaged or unreplicated DNA.

Question 19

Which of the following best explains why meiosis is essential for sexual reproduction?

Accepted Answer

It ensures genetic diversity and maintains chromosome number across generations.

Cell Structure, Types, and the Cell Cycle: Foundations for Biochemistry

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