Question 1

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

Accepted Answer

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

Question 2

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

Accepted Answer

S phase

Question 3

A researcher observes a cell with fully condensed chromosomes aligned at the metaphase plate, each chromatid attached to spindle microtubules. Which stage of mitosis is this cell in?

Accepted Answer

Metaphase

Question 4

Which of the following statements about the structure of DNA is correct?

Accepted Answer

The two strands are held together by hydrogen bonds between complementary bases

Question 5

A human somatic cell contains 46 chromosomes. After mitosis and cytokinesis, how many chromosomes will each daughter cell contain?

Accepted Answer

46

Question 6

Which checkpoint in the cell cycle is primarily responsible for ensuring that the cell has adequate size, nutrients, and undamaged DNA before DNA replication?

Accepted Answer

G1 checkpoint

Question 7

A scientist fuses a cell in S phase with a cell in G1 phase. What is the most likely outcome for the G1 nucleus?

Accepted Answer

It will be induced to begin DNA synthesis and enter S phase

Question 8

Which of the following best explains why cancer cells can form tumors?

Accepted Answer

They do not respond to signals that normally regulate the cell cycle

Question 9

In animal cells, cytokinesis is accomplished by which of the following processes?

Accepted Answer

Cleavage, resulting in a cleavage furrow

Question 10

Which of the following is true regarding the role of kinetochores during mitosis?

Accepted Answer

Kinetochores are protein complexes that attach chromosomes to spindle microtubules

Question 11

A cell is observed to have chromosomes decondensing, nuclear membranes reforming, and a cleavage furrow beginning to form. Which stage is this cell most likely in?

Accepted Answer

Telophase and cytokinesis

Question 12

Which of the following best describes the difference between mitosis in plant and animal cells?

Accepted Answer

Plant cells form a cell plate during cytokinesis, while animal cells form a cleavage furrow

Question 13

Which of the following events occurs during anaphase of mitosis?

Accepted Answer

Sister chromatids separate and move toward opposite poles

Question 14

A patient is treated with a chemotherapeutic drug that inhibits microtubule depolymerization. What is the most likely effect on mitosis?

Accepted Answer

Sister chromatids will not separate during anaphase

Question 15

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

Accepted Answer

Binary fission does not involve the breakdown of a nuclear envelope

Question 16

If a cell fails to attach all chromosomes to the spindle at the M checkpoint, what is the most likely consequence?

Accepted Answer

Anaphase will be delayed until all kinetochores are properly attached

Question 17

Which of the following best explains why chemotherapy often causes side effects such as hair loss and nausea?

Accepted Answer

Chemotherapy drugs interfere with the cell cycle in all rapidly dividing cells, including normal ones

Question 18

A cell is observed to have two centrosomes at opposite poles, a fully formed spindle, and chromosomes attached to spindle fibers but not yet separated. Which stage is this?

Accepted Answer

Metaphase

Question 19

Which of the following external signals is most likely to stimulate cell division in wound healing?

Accepted Answer

Platelet-derived growth factor (PDGF)

Question 20

If a eukaryotic cell receives a go-ahead signal at the G1 checkpoint, which of the following will most likely occur?

Accepted Answer

The cell will complete S, G2, and M phases and divide

The Cell Cycle: Mechanisms, Regulation, and Cancer

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