Question 1

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

Accepted Answer

Plant cells form a cell plate that develops into a new cell wall, while animal cells form a cleavage furrow that pinches the cell in two.

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 chromosomes aligned at the center of the cell, attached to spindle fibers from opposite poles. Which phase is this cell in?

Accepted Answer

Metaphase

Question 4

What is the primary function of the G0 phase in the cell cycle?

Accepted Answer

Cells are in a non-dividing, differentiated state and perform specialized functions.

Question 5

Which checkpoint in the cell cycle ensures that all chromosomes are properly attached to the spindle before anaphase begins?

Accepted Answer

M checkpoint

Question 6

Cancer cells differ from normal somatic cells in that they:

Accepted Answer

Can divide indefinitely without losing their ability to divide.

Question 7

Which of the following events occurs during prophase of mitosis?

Accepted Answer

Chromatin condenses into visible chromosomes and the mitotic spindle begins to form.

Question 8

A plant root tip is an excellent place to study mitosis because:

Accepted Answer

It is a site of particularly rapid cell division.

Question 9

If a cell fails the G1 checkpoint due to DNA damage, what is the most likely outcome?

Accepted Answer

The cell will undergo apoptosis if the damage cannot be repaired.

Question 10

Which structure is responsible for organizing the microtubules of the mitotic spindle in animal cells?

Accepted Answer

Centrosome

Question 11

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

Accepted Answer

Anaphase

Question 12

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

Accepted Answer

They are highly specialized and do not normally divide.

Question 13

A cell is observed to have a completed septum and two distinct cytoplasmic regions, but the cell wall is not yet fully formed. Which process is this cell most likely undergoing?

Accepted Answer

Binary fission in a prokaryote

Question 14

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

Accepted Answer

Mitosis involves the breakdown and reformation of the nuclear envelope, while binary fission does not.

Question 15

If a mutation prevents the formation of kinetochores during mitosis, what would be the most likely consequence?

Accepted Answer

Chromosomes would not attach to spindle microtubules and would fail to segregate properly.

Question 16

Which of the following equations best represents the number of chromosomes in a human somatic cell after S phase but before mitosis?

Accepted Answer

$$2n$$ chromosomes, each consisting of two sister chromatids

Question 17

A scientist stains DNA in a sample of dividing cells and observes that some cells have visible nucleoli and uncondensed chromatin, while others have condensed chromosomes and no visible nucleoli. Which stages are these cells most likely in?

Accepted Answer

Interphase and prophase, respectively

Question 18

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

Accepted Answer

Cancer cells bypass cell cycle checkpoints and continue dividing indefinitely.

Question 19

If a plant cell is observed to be forming a cell plate during cytokinesis, which phase of mitosis has it just completed?

Accepted Answer

Telophase

Mitosis and the Eukaryotic Cell Cycle: Structure, Phases, and Regulation

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