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Which nutrient is enzymatically digested in the stomach?

A.

Disaccharides

B.

Lipids

C.

Minerals

D.

Proteins

Answer and Explanation

The Correct Answer is D

A. Disaccharides: Broken down by brush-border enzymes (sucrase, lactase, maltase) in the small intestine, not in the stomach.
B. Lipids: Major digestion of dietary fats occurs in the small intestine via pancreatic lipase (with minor contribution from gastric lipase), so the stomach is not the main site.
C. Minerals: Inorganic nutrients that are absorbed, not enzymatically digested.
D. Proteins: Protein digestion begins in the stomach where pepsin (activated from pepsinogen in an acidic environment) breaks peptide bonds into smaller polypeptides.


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Related Questions

Correct Answer is C

Explanation

A. Proliferation: Refers to the rebuilding of the endometrium under estrogen influence during the follicular phase, not linked to progesterone withdrawal.
B. Ovulation: Triggered primarily by a surge of luteinizing hormone (LH), not by decreased progesterone.
C. Menstruation: Sudden drop in progesterone (and estrogen) causes shedding of the endometrial lining, leading to menstruation.
D. Implantation: Occurs when a fertilized embryo attaches to a progesterone-maintained endometrium, so decreased progesterone would prevent this.

Correct Answer is A

Explanation

A. An isotonic solution: Has the same solute concentration as the cell interior, so water movement is balanced and the cell size remains unchanged.
B. Hypotonic solution: Has lower solute concentration outside the cell, so water enters the cell, causing swelling or lysis.
C. Hydrostatic solution: Refers to fluid pressure exerted by a liquid, not osmotic balance related to cell size.
D. Hypertonic solution: Has higher solute concentration outside the cell, so water leaves the cell, causing shrinkage (crenation).

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