The approximate length of the small intestine is

Correct Answer: C

Rationale: The small intestine averages 7 meters in adults, varying (6-7 m). '7 m,' is correct, per anatomy (e.g., Tortora), spanning duodenum, jejunum, and ileum. '3 m,' is too short. '5 m,' underestimates. '9 m,' exceeds typical length. The 7 m standard reflects its absorptive expanse, making C the accurate answer.

Correct Answer: C

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.

Correct Answer: D

Rationale: Staining techniques identify microbes by dye interaction. 'Positive,' is correct as the exception, not a technique, per microbiology (e.g., Tortora). 'Gram,' differentiates bacteria. 'Acid fast,' detects mycobacteria. 'Negative,' stains background. Positive's lack of specificity makes D the precise answer.

Correct Answer: D

Rationale: Microbial identification uses traits and reactions. 'Sterilization,' is correct as the exception, killing microbes, not identifying, per microbiology (e.g., Murray). 'Morphology,' examines shape. 'Biochemical tests,' assess metabolism. 'Serological tests,' detect antigens. Sterilization's purpose makes D the accurate answer.

Correct Answer: D

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.