Question 1

Which of the following best describes the difference between a covalent bond and an ionic bond?

Accepted Answer

A covalent bond involves the sharing of electrons between atoms, while an ionic bond involves the transfer of electrons from one atom to another.

Question 2

A solution has a hydrogen ion concentration of $$[H^+] = 1 	imes 10$$^{-5}$$ M. What is the pH of this solution?

Accepted Answer

$$pH = 5$$

Question 3

Which functional group is present in all amino acids and is responsible for their acidic properties?

Accepted Answer

Carboxyl group ($$-COOH)$$

Question 4

Which macromolecule is correctly paired with its monomer?

Accepted Answer

Protein – Amino acid

Question 5

Which of the following statements correctly distinguishes prokaryotic cells from eukaryotic cells?

Accepted Answer

Prokaryotic cells lack membrane-bound organelles, while eukaryotic cells contain membrane-bound organelles.

Question 6

A red blood cell is placed in a solution and swells until it bursts. Which term best describes the solution?

Accepted Answer

Hypotonic

Question 7

Which process requires energy input from the cell to move substances against their concentration gradient?

Accepted Answer

Active transport

Question 8

How does an enzyme increase the rate of a chemical reaction?

Accepted Answer

By lowering the activation energy required for the reaction

Question 9

Which molecule is the immediate source of energy for cellular work, and what is the equation for its hydrolysis?

Accepted Answer

ATP; $$ATP + H_2O \rightarrow ADP + P_i + energy$$

Question 10

During aerobic cellular respiration, which stage produces the most ATP?

Accepted Answer

Electron transport chain and chemiosmosis

Question 11

Which of the following correctly describes the main products of the light reactions of photosynthesis?

Accepted Answer

ATP, NADPH, and $$O_2$$

Question 12

Which event occurs during the Calvin cycle but not during the light reactions of photosynthesis?

Accepted Answer

Carbon fixation

Question 13

Which of the following correctly lists the order of mitosis stages?

Accepted Answer

Prophase, Metaphase, Anaphase, Telophase

Question 14

Which process increases genetic variation during meiosis?

Accepted Answer

Crossing-over during prophase I

Question 15

A woman with genotype $$AaBb ($$where A and B are dominant alleles) is crossed with a man with genotype $$aabb. $$What is the probability that their child will have the genotype $$Aabb$$?

Accepted Answer

$$0.25$$

Question 16

Which of the following is an example of incomplete dominance?

Accepted Answer

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

Question 17

Which enzyme is responsible for unwinding the DNA double helix during DNA replication?

Accepted Answer

Helicase

Question 18

Which of the following best describes the process of transcription?

Accepted Answer

Synthesis of RNA from a DNA template

Question 19

Which of the following is a direct result of natural selection?

Accepted Answer

A population becomes better adapted to its environment over generations.

Question 20

Which modern biotechnology technique is used to amplify a specific DNA segment, and what is the equation for the number of DNA copies after $$n$$ cycles?

Accepted Answer

Polymerase Chain Reaction (PCR); $$N = N_0$ 	imes 2^n$$

Comprehensive Study Guide: Foundations of College Biology

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