The shape of the DNA molecule is described as a

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ATI RN Test Bank

A. double helix B. double circle C. straight strand D. none of the above

Correct Answer: A

Rationale: DNA's double helix structure was described by Watson and Crick.

What type of connective tissue consists of fibroblasts and bundles of parallel collagen fibers?

A. Areolar connective B. Fibrocartilage C. Irregular dense connective D. Regular dense connective

Correct Answer: D

Rationale: Regular dense connective tissue (e.g., tendons) has parallel collagen fibers and fibroblasts.

Identify the two types of bone tissue.

A. Compact and skeletal B. Compact and hyaline C. Compact and spongy D. Spongy and skeletal

Correct Answer: C

Rationale: Bone tissue is compact (dense) and spongy (trabecular), differing in structure.

Which type of neuroglia forms the myelin sheath in the brain and spinal cord?

A. astrocytes B. microglia C. oligodendrocytes D. Schwann cells

Correct Answer: C

Rationale: Oligodendrocytes myelinate axons in the CNS (brain and spinal cord).

The pleurae are serous membranes that form a double layer around the

A. lungs B. heart C. small intestine D. inner ear

Correct Answer: A

Rationale: Pleurae (parietal and visceral) encase the lungs in the thoracic cavity.

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