Q: In a population, the frequency of allele A is $$p = 0.7$$ and the frequency of allele a is $$q = 0.3. $$According to Hardy-Weinberg equilibrium, what is the expected frequency of heterozygotes?

$$2pq = 2 \times 0.7 \times 0.3 = 0.42$$

Question 1

Which of the following best describes a non-polar covalent bond?

Accepted Answer

A bond where electrons are shared equally between two atoms.

Question 2

Which macromolecule is correctly paired with its monomer?

Accepted Answer

Proteins – Amino acids

Question 3

A patient is diagnosed with a disorder that affects the fluidity of their cell membranes. Which component is most likely altered?

Accepted Answer

Phospholipids

Question 4

Which of the following best explains why water is an excellent solvent for many biological molecules?

Accepted Answer

Water is polar, allowing it to dissolve other polar and ionic substances.

Question 5

During which stage of cellular respiration is the majority of ATP produced?

Accepted Answer

Electron Transport Chain

Question 6

A scientist discovers a new organism with cells that contain a nucleus and membrane-bound organelles. To which domain does this organism most likely belong?

Accepted Answer

Eukarya

Question 7

If a diploid organism has a genotype AaBb, what is the expected phenotypic ratio in the offspring from a cross AaBb x AaBb, assuming independent assortment and complete dominance?

Accepted Answer

$$9:3:3:1$$

Question 8

Which process is responsible for the semi-conservative nature of DNA replication?

Accepted Answer

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

Question 9

A mutation changes a codon from UAU to UAA. What is the most likely effect on the resulting protein?

Accepted Answer

Translation will terminate prematurely, producing a truncated protein.

Question 10

Which of the following best describes the function of tRNA during translation?

Accepted Answer

It brings specific amino acids to the ribosome based on the mRNA codon.

Question 11

In a population, the frequency of allele A is $$p = 0.7$$ and the frequency of allele a is $$q = 0.3. $$According to Hardy-Weinberg equilibrium, what is the expected frequency of heterozygotes?

Accepted Answer

$$2pq = 2 	imes 0.7 	imes 0.3 = 0.42$$

Question 12

Which of the following is an example of genetic drift?

Accepted Answer

A hurricane randomly kills most of a population, leaving only a few survivors.

Question 13

Which of the following statements about enzymes is correct?

Accepted Answer

Enzymes lower the activation energy of chemical reactions.

Question 14

A plant is exposed to light of only green wavelengths. What is the most likely effect on the rate of photosynthesis?

Accepted Answer

The rate of photosynthesis will decrease because green light is mostly reflected, not absorbed.

Question 15

Which of the following best describes allopatric speciation?

Accepted Answer

A population is divided by a physical barrier, leading to the formation of new species.

Question 16

Which of the following is a correct statement about homologous chromosomes?

Accepted Answer

They carry the same genes in the same order but may have different alleles.

Question 17

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

Accepted Answer

Autosomal dominant

Question 18

Which of the following best explains the purpose of mitosis in multicellular organisms?

Accepted Answer

To produce genetically identical cells for growth and repair.

Question 19

Which of the following is a correct interpretation of a graph showing the absorption spectrum of chlorophyll?

Accepted Answer

Chlorophyll absorbs light most efficiently in the blue and red regions of the spectrum.

Question 20

A scientist is testing the effect of a new drug on bacterial growth. Which step is essential to ensure the process of science is followed?

Accepted Answer

Including a control group that does not receive the drug.

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