$$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6 \mathrm{O}_2 \rightarrow 6 \mathrm{CO}_2 + 6 \mathrm{H}_2\mathrm{O} + \text{energy}$$

Question 1

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

Accepted Answer

Catabolic pathways break down complex molecules to release energy, while anabolic pathways use energy to build complex molecules from simpler ones.

Question 2

During glycolysis, glucose is converted into which molecule, and how many net ATP molecules are produced per glucose?

Accepted Answer

Glucose is converted into 2 pyruvate molecules, producing a net gain of 2 ATP.

Question 3

Which of the following equations correctly represents the overall process of cellular respiration?

Accepted Answer

$$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6 \mathrm{O}_2 ightarrow 6 \mathrm{CO}_2 + 6 \mathrm{H}_2\mathrm{O} + 	ext{energy}$$

Question 4

Which of the following best explains why enzymes are necessary for metabolic reactions in living organisms?

Accepted Answer

Enzymes lower the activation energy barrier, allowing reactions to occur at cellular temperatures.

Question 5

A mutation causes a cell to produce a nonfunctional ATP synthase. Which process would be most directly affected?

Accepted Answer

Oxidative phosphorylation

Question 6

Which of the following statements about photosynthesis is correct?

Accepted Answer

The light-dependent reactions produce ATP and NADPH, which are used in the Calvin cycle to fix carbon dioxide.

Question 7

Which of the following best describes the difference between mitosis and meiosis?

Accepted Answer

Mitosis produces two genetically identical cells, while meiosis produces four genetically unique cells.

Question 8

A cell with a diploid number of 8 undergoes meiosis. How many chromosomes will each resulting gamete contain?

Accepted Answer

4

Question 9

Which of the following is an example of incomplete dominance?

Accepted Answer

A cross between a red-flowered and a white-flowered plant produces pink-flowered offspring.

Question 10

Which of the following best describes the principle of independent assortment?

Accepted Answer

Alleles for different genes assort independently of one another during gamete formation.

Question 11

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

Accepted Answer

ABO blood group in humans, where both IA and IB alleles are expressed in the phenotype.

Question 12

Which process is responsible for the majority of ATP production during aerobic respiration?

Accepted Answer

Oxidative phosphorylation (electron transport chain and chemiosmosis)

Question 13

Which of the following best explains why crossing over during meiosis increases genetic diversity?

Accepted Answer

It allows homologous chromosomes to exchange genetic material, creating new allele combinations.

Question 14

Which of the following is the correct sequence of events in the cell cycle?

Accepted Answer

G1 phase → S phase → G2 phase → M phase

Question 15

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

Accepted Answer

tRNA carries amino acids to the ribosome and matches them to the coded mRNA message.

Question 16

Which of the following is true about the structure of DNA?

Accepted Answer

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

Question 17

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

Accepted Answer

Water is polar, allowing it to form hydrogen bonds with many substances.

Question 18

Which of the following best describes the function of the Calvin cycle in photosynthesis?

Accepted Answer

It fixes carbon dioxide into organic molecules using ATP and NADPH.

Question 19

Which of the following is a correct statement about epigenetics?

Accepted Answer

Epigenetic modifications can regulate gene expression without changing the DNA sequence.

Question 20

Which of the following best explains why humans have evolved to be efficient long-distance runners, according to the evidence discussed?

Accepted Answer

Humans have anatomical adaptations such as long legs, arched feet, and sweat glands for endurance running.

General Biology: Core Concepts and Processes

Study Guide - Practice Questions