Question 1

During which phase of mitosis do the centromeres split, allowing sister chromatids to become daughter chromosomes and move to opposite poles of the cell?

Accepted Answer

Anaphase

Question 2

Which of the following best describes the outcome of mitosis in human somatic cells?

Accepted Answer

Two diploid cells, each identical to the parent cell

Question 3

A mutation in a gene regulating the G1 checkpoint of the cell cycle could most likely result in which of the following?

Accepted Answer

Uncontrolled cell division, potentially leading to cancer

Question 4

Which event is unique to Prophase I of meiosis and does NOT occur during mitosis?

Accepted Answer

Crossing over between homologous chromosomes

Question 5

If a cell with 46 chromosomes undergoes meiosis, what is the chromosome number in each resulting gamete?

Accepted Answer

$$23$$

Question 6

Which of the following best explains why eggs in females are larger than sperm in males after meiosis?

Accepted Answer

Eggs receive more cytoplasm during division, while sperm divide equally

Question 7

A patient is exposed to ionizing radiation, which disrupts cell cycle regulation. Which treatment is most likely to be used to stop abnormal cell division?

Accepted Answer

Chemotherapy to inhibit mitosis

Question 8

During which phase of mitosis does the mitotic spindle attach to the centromeres of duplicated chromosomes, aligning them at the cell's center?

Accepted Answer

Metaphase

Question 9

Which checkpoint in the cell cycle ensures that DNA has been properly replicated before mitosis begins?

Accepted Answer

End of G2

Question 10

Which of the following environmental factors is most likely to cause abnormal differentiation during fetal development?

Accepted Answer

Exposure to thalidomide

Question 11

A cell undergoes meiosis I and II. How many genetically unique daughter cells are produced, and what is their chromosome number?

Accepted Answer

Four cells, each with $$23$$ chromosomes

Question 12

Which process is responsible for the constant replacement of cells in the stomach lining due to harsh gastric juices?

Accepted Answer

Mitosis

Question 13

Which of the following statements about cytokinesis is correct?

Accepted Answer

It occurs after telophase and results in two identical daughter cells

Question 14

Which of the following best describes the genetic content of daughter cells produced by mitosis compared to meiosis?

Accepted Answer

Mitosis produces genetically identical diploid cells; meiosis produces genetically unique haploid cells

Question 15

Which phase of meiosis is halted in the secondary oocyte of females until fertilization occurs?

Accepted Answer

Metaphase II

Question 16

Which of the following is a direct result of crossing over during Prophase I of meiosis?

Accepted Answer

Genetic recombination of parental genes

Question 17

Which internal mechanism activates regulatory proteins to initiate specific events in the cell cycle?

Accepted Answer

Cyclins

Question 18

A scientist observes a cell with a contractile ring forming a cleavage furrow. Which process is being observed?

Accepted Answer

Cytokinesis

Question 19

Which of the following best explains why red bone marrow must constantly undergo mitosis?

Accepted Answer

Red blood cells have a short lifespan and must be replaced rapidly

Question 20

Which of the following scenarios best illustrates the influence of environmental factors on cell differentiation?

Accepted Answer

Exposure to lead during early embryonic development causes abnormal gene expression

Mitosis, Meiosis, and Cell Differentiation: Processes, Regulation, and Implications

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