Question 1

Which of the following best describes the main purpose of mitosis in multicellular organisms?

Accepted Answer

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

Question 2

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

Accepted Answer

S phase

Question 3

A scientist observes a eukaryotic cell with two centrosomes at opposite poles and chromosomes aligned at the cell's equator. Which phase of mitosis is this cell in?

Accepted Answer

Metaphase

Question 4

Which structure is responsible for attaching to chromosomes and moving them during mitosis?

Accepted Answer

Mitotic spindle

Question 5

If a human somatic cell contains 46 chromosomes, how many chromosomes will each daughter cell have after mitosis?

Accepted Answer

46

Question 6

Which of the following statements about sister chromatids is correct?

Accepted Answer

They are identical copies of a chromosome joined at the centromere

Question 7

What is the main difference between mitosis and meiosis?

Accepted Answer

Mitosis produces genetically identical cells, meiosis produces genetically diverse gametes

Question 8

Which of the following best describes the composition of eukaryotic chromosomes?

Accepted Answer

A complex of DNA and protein called chromatin

Question 9

A mutation prevents the formation of the mitotic spindle in a cell. What is the most likely consequence?

Accepted Answer

Sister chromatids will not separate properly during mitosis

Question 10

Which phase of the cell cycle is the longest and what key event occurs during this phase?

Accepted Answer

Interphase; cell grows and DNA is replicated

Question 11

In a certain species, somatic cells have 24 chromosomes. How many chromosomes will be present in the gametes produced by meiosis?

Accepted Answer

12

Question 12

Which of the following events occurs during prophase of mitosis?

Accepted Answer

Assembly of spindle microtubules begins in the centrosome

Question 13

A cell is observed with condensed chromosomes, a mitotic spindle forming, and the nuclear envelope breaking down. Which phase is this cell most likely in?

Accepted Answer

Prometaphase

Question 14

Which of the following best explains why gametes are genetically different from each other and from the parent cell?

Accepted Answer

They are produced by meiosis, which involves recombination and independent assortment

Question 15

What is the role of the centromere during cell division?

Accepted Answer

It is where spindle fibers attach to separate sister chromatids

Question 16

Which of the following is NOT a function of cell division in multicellular organisms?

Accepted Answer

Production of energy

Question 17

A patient has a genetic disorder where their cells cannot properly condense chromatin into chromosomes during cell division. What is a likely consequence?

Accepted Answer

Chromosomes will not be evenly distributed to daughter cells

Question 18

Which of the following correctly matches the cell cycle phase with its main event?

Accepted Answer

S phase: DNA synthesis

Question 19

If a drug disrupts the formation of asters during mitosis, what process will be directly affected?

Accepted Answer

Organization of spindle microtubules at the centrosomes

Question 20

Which of the following best describes the relationship between chromosomes, chromatin, and DNA?

Accepted Answer

DNA is packaged into chromatin, which condenses to form chromosomes

The Cell Cycle: Structure, Phases, and Mechanisms of Cell Division

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