The rungs of a DNA ladder are made of

ATI RN

ATI RN Test Bank

A. alternating sugar and phosphate B. complementary base pairs C. alternating uracil and phosphate D. none of the above

Correct Answer: B

Rationale: DNA's rungs are base pairs (A-T, C-G); the backbone is sugar-phosphate.

Identify the types of fibers associated with connective tissue.

A. Collagen, elastic and reticular B. Collagen, elastic and keratin C. Collagen, keratin and reticular D. Elastic, keratin and reticular

Correct Answer: A

Rationale: Connective tissue fibers are collagen (strength), elastic (stretch), and reticular (support).

Compact bone consists of cylindrical units called

A. trabeculae B. Haversian systems C. osteons D. Both B and C are correct

Correct Answer: C

Rationale: Osteons (or Haversian systems) are the cylindrical units of compact bone.

Identify the two basic cells of nervous tissue.

A. Axons and neurons B. Axons and dendrites C. Neurons and dendrites D. Neurons and neuroglia

Correct Answer: D

Rationale: Nervous tissue includes neurons (signal conductors) and neuroglia (support cells).

Which body system would NOT be lined with a mucous membrane?

A. digestive B. respiratory C. urogenital D. cardiovascular

Correct Answer: D

Rationale: Cardiovascular system is lined by endothelium, not mucous membranes.

$89/ 30 days

$150/ 90 days