Question 1

Which of the following best explains why the number of chromosomes does NOT correlate with an organism’s complexity?

Accepted Answer

Chromosome number varies independently of complexity because gene content and regulation, not just chromosome count, determine complexity.

Question 2

A bacterial population is grown in a nutrient-rich medium. Which equation best describes the exponential phase of bacterial growth, and what does this phase represent?

Accepted Answer

The equation $$N_t = N_0$ e$$^{rt}$$; it represents the phase where bacteria divide at a constant, maximum rate.

Question 3

If both copies of a tumor suppressor gene are mutated in a cell, what is the most likely outcome?

Accepted Answer

The cell will be unable to initiate apoptosis and may divide uncontrollably.

Question 4

Which of the following best describes the three 'D' choices a cell can make?

Accepted Answer

Divide, Differentiate, Die: Cells can continue to divide, specialize into a specific function, or undergo programmed cell death.

Question 5

Which checkpoint in the cell cycle ensures that DNA is undamaged and fully replicated before mitosis, and what is required to pass this checkpoint?

Accepted Answer

G2 checkpoint; the cell must have completely replicated DNA with no damage.

Question 6

Which of the following is NOT a difference between mitosis and meiosis?

Accepted Answer

Mitosis increases genetic diversity through crossing over; meiosis does not.

Question 7

How does independent assortment during meiosis contribute to genetic diversity?

Accepted Answer

It ensures that each gamete receives a random mix of maternal and paternal chromosomes.

Question 8

A woman with genotype $$Aa$$ for a trait and a man with genotype $$aa$$ have a child. What is the probability the child will have the dominant phenotype?

Accepted Answer

$$0.5$$

Question 9

Which of the following best describes incomplete dominance?

Accepted Answer

The heterozygote displays a phenotype intermediate between the two homozygotes.

Question 10

A pedigree shows a trait that appears in every generation and affects both males and females equally. What is the most likely inheritance pattern?

Accepted Answer

Autosomal dominant

Question 11

Which scientist’s X-ray diffraction images were critical in revealing the double helix structure of DNA?

Accepted Answer

Rosalind Franklin

Question 12

Which base pairing is correct according to the structure of DNA?

Accepted Answer

Adenine pairs with thymine, guanine pairs with cytosine.

Question 13

How does alternative splicing increase protein diversity in eukaryotic cells?

Accepted Answer

By allowing different combinations of exons to be joined, producing multiple proteins from one gene.

Question 14

Which statement best describes the function of the Lac Operon in E. coli?

Accepted Answer

It enables the cell to metabolize lactose only when lactose is present and glucose is absent.

Question 15

Why is PCR (Polymerase Chain Reaction) a valuable tool in forensic analysis?

Accepted Answer

It can amplify tiny amounts of DNA, making it possible to analyze trace evidence from crime scenes.

Question 16

Which of the following is a potential disadvantage of genetically modified (GM) crops?

Accepted Answer

Potential for gene flow to wild relatives, leading to ecological concerns.

Question 17

A child is born with a rare autosomal recessive disorder. Both parents are healthy but have a sibling with the disorder. What is the probability that both parents are carriers?

Accepted Answer

$$1.0$$

Question 18

Which of the following best explains why genetic variability in a population reduces susceptibility to disease?

Accepted Answer

It increases the chance that some individuals possess alleles that confer resistance to specific diseases.

Question 19

Which of the following scenarios best illustrates polygenic inheritance?

Accepted Answer

Multiple genes contribute to the continuous variation in human skin color.

Question 20

Why might regulation of gene editing technologies, such as CRISPR, be important?

Accepted Answer

To prevent unethical uses and unintended consequences, such as ecological disruption or social inequality.

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