Question 1

Which of the following best describes the main function of the cell cycle in multicellular organisms?

Accepted Answer

To drive growth, repair, and reproduction by producing new cells with identical genetic information

Question 2

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

Accepted Answer

S phase; it ensures that each daughter cell receives a complete set of genetic information

Question 3

Which of the following equations correctly represents the chromosome number in a diploid human somatic cell?

Accepted Answer

$$2n = 46$$

Question 4

What is the primary difference between mitosis and meiosis in terms of genetic outcome?

Accepted Answer

Mitosis produces genetically identical cells, while meiosis produces genetically diverse cells

Question 5

Which structure is responsible for organizing microtubules during animal cell division?

Accepted Answer

Centrosome

Question 6

A cell is observed with chromosomes aligned at the metaphase plate, spindle fibers attached to kinetochores, and centrosomes at opposite poles. Which stage of mitosis is this cell in?

Accepted Answer

Metaphase

Question 7

Which checkpoint ensures that all chromosomes are properly attached to spindle fibers before sister chromatids are separated?

Accepted Answer

M checkpoint

Question 8

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

Accepted Answer

Cell plate

Question 9

Which of the following best explains why cancer cells can divide uncontrollably?

Accepted Answer

They bypass cell cycle checkpoints and ignore growth signals

Question 10

A researcher observes a cell with two sets of chromosomes, each set coming from a different parent. What is the ploidy of this cell, and what type of cell is it most likely to be?

Accepted Answer

Diploid; somatic cell

Question 11

Which of the following is TRUE about binary fission in prokaryotes?

Accepted Answer

It produces genetically identical daughter cells

Question 12

If a cell fails the G₂ checkpoint due to incomplete DNA replication, what is the most likely outcome?

Accepted Answer

The cell pauses to complete DNA replication or repair

Question 13

Which of the following best describes the role of cyclins and cyclin-dependent kinases (CDKs) in the cell cycle?

Accepted Answer

They regulate progression through the cell cycle by activating key events

Question 14

A mutation causes a cell to ignore the M checkpoint. What is a likely consequence of this mutation?

Accepted Answer

Chromosomes may not be evenly distributed to daughter cells, leading to aneuploidy

Question 15

Which of the following is a correct sequence of mitosis stages?

Accepted Answer

Prophase → Metaphase → Anaphase → Telophase

Question 16

Which of the following best describes the difference between sister chromatids and homologous chromosomes?

Accepted Answer

Sister chromatids are identical copies of a chromosome; homologous chromosomes are similar but not identical, one from each parent

Question 17

A cell is exposed to a chemical that prevents the breakdown of cohesin proteins during mitosis. What is the most likely result?

Accepted Answer

Sister chromatids will not separate during anaphase

Question 18

Which of the following scenarios best illustrates the importance of cell cycle checkpoints in preventing cancer?

Accepted Answer

A cell with damaged DNA is stopped at the G₁ checkpoint and repairs the damage before dividing

Question 19

Which of the following statements about chromosome number and organism complexity is correct?

Accepted Answer

Chromosome number is characteristic for each species but does not determine complexity

The Cell Cycle and Cell Division: Structure, Function, and Regulation

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