Question 1

Which of the following best describes the role of cyclins in the eukaryotic cell cycle?

Accepted Answer

Cyclins are signaling proteins that must be present for the cell to proceed through checkpoints in the cell cycle.

Question 2

A cell is observed to have condensed chromosomes aligned at the metaphase plate, with spindle fibers attached to kinetochores. Which phase of mitosis is this cell in?

Accepted Answer

Metaphase

Question 3

Which checkpoint in the cell cycle ensures that all chromosomes are properly aligned before the cell proceeds with division?

Accepted Answer

M checkpoint

Question 4

What is the primary difference between benign and malignant tumors?

Accepted Answer

Malignant tumors can metastasize to distant sites, while benign tumors remain localized.

Question 5

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

Accepted Answer

DNA replication takes place, resulting in chromosomes with two sister chromatids.

Question 6

A mutation in the p53 gene is likely to result in which of the following outcomes?

Accepted Answer

Uncontrolled cell division due to failure to halt the cell cycle at the G1 checkpoint.

Question 7

Which of the following best explains why cancer cells can form tumors while normal cells do not?

Accepted Answer

Cancer cells lack contact inhibition and continue dividing even when crowded.

Question 8

In animal cells, cytokinesis is accomplished by the formation of a contractile ring composed of which protein?

Accepted Answer

Actin

Question 9

Which of the following is a function of mitosis in multicellular organisms?

Accepted Answer

Growth, repair, and maintenance of tissues

Question 10

A researcher observes a cell with a single, circular DNA molecule attached to the plasma membrane, which is about to divide. This cell is most likely undergoing:

Accepted Answer

Binary fission

Question 11

Which of the following statements about telomeres and cancer is correct?

Accepted Answer

Mutations that activate telomerase can allow cancer cells to divide indefinitely.

Question 12

Which of the following best describes the difference between euchromatin and heterochromatin?

Accepted Answer

Euchromatin is loosely coiled and transcriptionally active, while heterochromatin is highly compacted and inactive.

Question 13

A patient is diagnosed with retinoblastoma, a cancer caused by a mutation in the RB gene. What is the normal function of the RB protein?

Accepted Answer

To inhibit the cell cycle and prevent uncontrolled cell division

Question 14

Which of the following is a correct sequence of events during apoptosis?

Accepted Answer

Chromatin condenses, plasma membrane blisters, cell fragments are engulfed

Question 15

Which of the following best explains why binary fission in prokaryotes does not require a mitotic spindle?

Accepted Answer

The single, circular chromosome is attached to the plasma membrane and segregates as the cell elongates.

Question 16

A scientist is culturing human stem cells for therapeutic cloning. Which of the following is a potential application of these cells?

Accepted Answer

Regenerating damaged tissues or organs in patients

Question 17

Which of the following is a characteristic of cancer cells but NOT normal cells?

Accepted Answer

Are non-specialized and can divide indefinitely

Question 18

If a proto-oncogene mutates to become an oncogene, what is the likely result?

Accepted Answer

The cell cycle is stimulated, leading to uncontrolled cell division.

Question 19

Which of the following best describes the function of the mitotic spindle during mitosis?

Accepted Answer

It organizes and separates sister chromatids to opposite poles of the cell.

Question 20

A plant cell is observed forming a cell plate during cytokinesis. What is the origin of the membrane that forms the new cell plate?

Accepted Answer

It is formed by the fusion of Golgi-derived vesicles.

The Cell Cycle and Cellular Reproduction: Structure, Regulation, and Clinical Relevance

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