Identify the macromolecule that has a 21 ratio of

ATI RN

ATI RN Test Bank

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.

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.

What special type of epithelium is found in the urinary bladder that allows distention?

A. transitional B. simple squamous C. stratified squamous D. pseudostratified columnar

Correct Answer: A

Rationale: Transitional epithelium stretches and recoils in the bladder as it fills and empties.

Chondrocytes are cells associated with:

A. loose connective tissue B. adipose tissue C. cartilage D. fibrous connective tissue

Correct Answer: C

Rationale: Chondrocytes are cartilage cells, producing and maintaining the cartilaginous matrix.

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