Question 1

Which of the following best describes the process of science as discussed in the course materials?

Accepted Answer

A systematic approach involving hypotheses, experiments, and theories to understand natural phenomena.

Question 2

Which of the following is NOT a requirement for evolution by natural selection?

Accepted Answer

All individuals must have equal reproductive success.

Question 3

Which of the following best explains why water is considered a universal solvent in biological systems?

Accepted Answer

Water's small, polar nature allows it to dissolve many ionic and polar substances.

Question 4

Which equation correctly represents the relationship between pH and hydrogen ion concentration $$[H^+]$$?

Accepted Answer

$$pH = -\log_{10} [H^+]$$

Question 5

A cell is placed in a solution and water moves out of the cell, causing it to shrink. Which type of solution is the cell in?

Accepted Answer

Hypertonic

Question 6

Which of the following best describes the function of the sodium-potassium pump ($$Na^+/K^+$$ pump) in animal cells?

Accepted Answer

It uses ATP to actively transport sodium out and potassium into the cell.

Question 7

Which of the following statements about enzymes is correct?

Accepted Answer

Enzymes lower the activation energy of biochemical reactions.

Question 8

During aerobic respiration, which molecule acts as the final electron acceptor in the electron transport chain?

Accepted Answer

Oxygen ($$O_2)$$

Question 9

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

Accepted Answer

Mitosis produces diploid somatic cells, while meiosis produces haploid gametes.

Question 10

A woman with type AB blood and a man with type O blood have a child. What is the probability that the child will have type A blood?

Accepted Answer

50%

Question 11

Which of the following is an example of a polygenic trait in humans?

Accepted Answer

Height

Question 12

Which of the following best explains the role of histones in eukaryotic cells?

Accepted Answer

They package DNA into nucleosomes, aiding in chromosome structure.

Question 13

Which of the following best describes the function of the lac operon in E. coli?

Accepted Answer

It controls the breakdown of lactose in response to its presence.

Question 14

Which of the following is a correct statement about the Central Dogma of molecular biology?

Accepted Answer

Information flows from DNA to RNA to protein.

Question 15

A mutation changes a codon from $$UAC ($$tyrosine) to $$UAA ($$stop codon). What type of mutation is this?

Accepted Answer

Nonsense mutation

Question 16

Which of the following best describes the process of feedback inhibition in metabolic pathways?

Accepted Answer

The end product of a pathway inhibits an enzyme involved early in the pathway.

Question 17

Which of the following is a real-world example of the importance of buffers in biological systems?

Accepted Answer

Maintaining blood pH within a narrow range to support enzyme function.

Question 18

Which of the following best explains why C4 plants are more efficient than C3 plants in hot, dry environments?

Accepted Answer

C4 plants spatially separate carbon fixation and the Calvin cycle, reducing photorespiration.

Question 19

Which of the following best describes the role of restriction enzymes in genetic engineering?

Accepted Answer

They cut DNA at specific sequences, allowing gene cloning.

Question 20

A patient with kidney disease is advised to limit protein intake. Which metabolic process explains this recommendation?

Accepted Answer

Deamination of amino acids produces ammonia, which is converted to urea and excreted by the kidneys.

General Biology I (BIO 121) Syllabus and Study Guide

Study Guide - Practice Questions