Particles that have either a positive or a negativ

ATI RN

ATI RN Test Bank

Particles that have either a positive or a negative charge are called:

A. reactions B. ions C. compound D. molecule

Correct Answer: B

Rationale: Ions are atoms or molecules with a net charge due to electron gain or loss.

Identify the macromolecule that has a 2:1 ratio of hydrogen to oxygen atoms.

A. Carbohydrates B. Lipids C. Nucleic acids D. Proteins

Correct Answer: A

Rationale: Carbohydrates (e.g., C6H12O6) have a 2:1 H:O ratio.

Which of the following is NOT a type of lipid?

A. glycogen B. steroids C. triglycerides D. phospholipids

Correct Answer: A

Rationale: Glycogen is a carbohydrate; steroids, triglycerides, and phospholipids are lipids.

Enzymes allow reactions to occur at normal body temperatures by:

A. decreasing pH B. increasing pH C. decreasing energy of activation D. increasing energy of activation

Correct Answer: C

Rationale: Enzymes lower the activation energy, speeding reactions at physiological temperatures.

Which of the following is NOT a function of epithelium?

A. secretion B. contraction C. protection D. absorption

Correct Answer: B

Rationale: Epithelium functions in secretion, protection, and absorption; contraction is a muscle tissue role.

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