Question 1

Which of the following correctly lists the levels of biological organization from largest to smallest?

Accepted Answer

Biosphere, ecosystem, community, population, organism, organ system, organ, tissue, cell, organelle, molecule

Question 2

A scientist is studying a newly discovered cell. It contains a nucleus, mitochondria, and chloroplasts. Which domain does this organism most likely belong to?

Accepted Answer

Domain Eukarya

Question 3

Which of the following statements about DNA structure is correct?

Accepted Answer

DNA is a double helix with antiparallel strands held together by hydrogen bonds between complementary bases.

Question 4

Which of the following best describes the difference between catabolic and anabolic pathways?

Accepted Answer

Catabolic pathways break down molecules and release energy, while anabolic pathways build molecules and consume energy.

Question 5

A red blood cell is placed in a hypotonic solution. What will most likely happen to the cell, and why?

Accepted Answer

Water will enter the cell by osmosis, causing it to swell and possibly burst.

Question 6

Which of the following equations represents the Hardy-Weinberg equilibrium for allele frequencies in a population?

Accepted Answer

$$p^2 + 2pq$$ + $$q^2 = 1$

Question 7

During aerobic cellular respiration, what is the final electron acceptor in the electron transport chain?

Accepted Answer

Oxygen ($$O_2)$$

Question 8

Which of the following best explains why x-linked recessive disorders are more common in males than females?

Accepted Answer

Males have only one X chromosome, so a single recessive allele will cause the disorder.

Question 9

Which of the following is a property of water that allows it to moderate Earth's climate?

Accepted Answer

High specific heat capacity

Question 10

A mutation changes a codon from UAU to UAA in the coding sequence of a gene. What is the most likely result?

Accepted Answer

A premature stop codon will be introduced, resulting in a truncated protein.

Question 11

Which of the following best describes the role of NAD$$^+/$$NADH in cellular respiration?

Accepted Answer

NAD$$^+$$ acts as an electron carrier, accepting electrons during glycolysis and the citric acid cycle and delivering them to the electron transport chain.

Question 12

Which of the following is an example of a repressible operon in prokaryotes?

Accepted Answer

The trp operon, which is turned off when tryptophan is present.

Question 13

Which of the following best describes the difference between facilitated diffusion and active transport across a cell membrane?

Accepted Answer

Facilitated diffusion moves substances down their concentration gradient without energy input, while active transport moves substances against their gradient using energy.

Question 14

Which of the following is a real-world example of pleiotropy?

Accepted Answer

A single gene mutation in sickle cell disease affects hemoglobin structure, red blood cell shape, and resistance to malaria.

Question 15

Which of the following best describes the process of chemiosmosis in mitochondria?

Accepted Answer

The movement of protons down their electrochemical gradient through ATP synthase to generate ATP.

Question 16

Which of the following statements about the central dogma of molecular biology is correct?

Accepted Answer

Genetic information flows from DNA to RNA to protein.

Question 17

Which of the following is a difference between mitosis and meiosis?

Accepted Answer

Meiosis results in four genetically unique haploid cells, while mitosis results in two genetically identical diploid cells.

Question 18

Which of the following best explains why C$$_4$$ and CAM plants are better adapted to hot, arid climates than C$$_3$$ plants?

Accepted Answer

They minimize photorespiration by spatially or temporally separating carbon fixation from the Calvin cycle.

Question 19

A population of 1000 individuals has the following genotype frequencies: 490 AA, 420 Aa, and 90 aa. What is the frequency of the 'a' allele?

Accepted Answer

$$q = \frac{2 	imes 90 + 420}{2 	imes 1000} = 0.3$$

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