Question 1

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

Accepted Answer

To ensure growth, tissue renewal, and repair 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 cell with 24 chromosomes undergoes mitosis. How many chromosomes will each daughter cell have after cytokinesis?

Accepted Answer

24

Question 4

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

Accepted Answer

Centrosome

Question 5

What is the role of cohesins during mitosis?

Accepted Answer

They hold sister chromatids together until anaphase

Question 6

Which of the following events marks the transition from metaphase to anaphase?

Accepted Answer

Cohesins are cleaved by separase, allowing sister chromatids to separate

Question 7

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

Accepted Answer

Sister chromatids would not separate properly

Question 8

Which of the following best describes the difference between somatic cells and gametes in terms of chromosome number?

Accepted Answer

Somatic cells have twice as many chromosomes as gametes

Question 9

During anaphase, how do chromosomes move toward the spindle poles?

Accepted Answer

By motor proteins 'walking' along microtubules and depolymerization at the kinetochore ends

Question 10

A researcher observes a cell in which the chromosomes are lined up at the center of the cell, but have not yet separated. Which stage of mitosis is this cell in?

Accepted Answer

Metaphase

Question 11

Which of the following is true about cytokinesis in animal cells?

Accepted Answer

It divides the cytoplasm, resulting in two genetically identical daughter cells

Question 12

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

Accepted Answer

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

Question 13

Which of the following best explains why the continuity of life depends on cell division?

Accepted Answer

Cell division ensures the accurate transmission of genetic material to the next generation

Question 14

A scientist is studying a cell in which the spindle microtubules are not properly attached to kinetochores. What is the most likely consequence for chromosome segregation?

Accepted Answer

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

Question 15

Which phase of the cell cycle is characterized by metabolic activity, growth, and preparation for cell division, but not DNA synthesis?

Accepted Answer

G1 phase

Question 16

If a cell's genome consists of $$n$$ DNA molecules, and after S phase it has $$2n$$ DNA molecules, what process is responsible for this change?

Accepted Answer

DNA replication

Question 17

Which of the following statements about the mitotic spindle is correct?

Accepted Answer

It controls chromosome movement during mitosis

Question 18

A patient has a genetic disorder that affects the function of separase. Which stage of mitosis would most likely be disrupted?

Accepted Answer

Anaphase

Question 19

Which of the following best describes the 'Pac-man' mechanism during anaphase?

Accepted Answer

Chromosomes are 'walked' along microtubules by motor proteins, and microtubules depolymerize at the kinetochore ends

Question 20

In a real-world scenario, a tissue sample from a cancer patient shows uncontrolled cell division. Which phase of the cell cycle is most likely being bypassed or deregulated?

Accepted Answer

Cell cycle checkpoints

The Cell Cycle: Structure, Function, and Phases

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