Question 1

Which of the following best describes the main purpose of cell cycle checkpoints?

Accepted Answer

To verify that the cell has replicated its DNA and that the DNA is undamaged before proceeding to the next phase

Question 2

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

Accepted Answer

Anaphase

Question 3

A scientist observes a cell with chromosomes aligned at the center of the cell, attached to spindle fibers from opposite poles. Which stage of mitosis is this cell in?

Accepted Answer

Metaphase

Question 4

Which of the following equations correctly represents the number of possible combinations of chromosomes due to independent assortment in a diploid organism with $$n$$ chromosome pairs?

Accepted Answer

$$2^n$$

Question 5

What is the primary difference between cytokinesis in plant cells and animal cells?

Accepted Answer

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

Question 6

Which of the following statements about cancer cells is correct?

Accepted Answer

Cancer cells divide uncontrollably due to loss of cell cycle regulation

Question 7

If a diploid cell with 8 chromosomes undergoes mitosis, how many chromosomes will each daughter cell have?

Accepted Answer

8

Question 8

Which process is responsible for the genetic variation observed in offspring produced by sexual reproduction?

Accepted Answer

Both crossing over and independent assortment

Question 9

A cell fails to separate homologous chromosomes during meiosis I. What is the likely result in the gametes produced?

Accepted Answer

Half the gametes will have an extra chromosome, and half will have one less

Question 10

Which experiment provided evidence that DNA, not protein, is the hereditary material?

Accepted Answer

The Hershey-Chase experiment

Question 11

What is the main function of DNA polymerase during DNA replication?

Accepted Answer

To synthesize new DNA strands by adding nucleotides to a primer

Question 12

Which of the following best explains why the lagging strand is synthesized discontinuously?

Accepted Answer

DNA polymerase can only add nucleotides in the 5' to 3' direction, so synthesis must occur in short fragments as the replication fork opens

Question 13

Which of the following is a correct statement about the principle of segregation?

Accepted Answer

Alleles for a gene separate during the formation of gametes

Question 14

A dihybrid cross between two heterozygous pea plants (RrYy x RrYy) produces what phenotypic ratio in the F2 generation, assuming independent assortment?

Accepted Answer

9:3:3:1

Question 15

Which of the following best describes codominance?

Accepted Answer

Both alleles are fully expressed in the phenotype of a heterozygote

Question 16

Which of the following is a direct result of the semi-conservative model of DNA replication?

Accepted Answer

Each new DNA molecule consists of one old strand and one new strand

Question 17

Which of the following best explains the role of proofreading during DNA replication?

Accepted Answer

It reduces the frequency of mutations by correcting mismatched bases

Question 18

Which of the following is an example of a model organism used in genetics research, and why are model organisms important?

Accepted Answer

Fruit flies; they have short generation times and are easy to maintain in the lab

Question 19

Which of the following best describes the process of binary fission in bacteria?

Accepted Answer

DNA is copied, the cell elongates, and the membrane pinches inward to divide the cell

Question 20

Which of the following is a likely consequence if a cell ignores DNA damage detected at a checkpoint and continues to divide?

Accepted Answer

The cell and its descendants may accumulate mutations, potentially leading to cancer

Cell Cycle, Mitosis, and Meiosis: Core Concepts in General Biology

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