Nokea
What is the site of amino acids absorption in human's small intestine?
- A. Duodenum
- B. Jejunum
- C. Ileum
- D. Both (2) and (3)
Correct Answer: D
Rationale: Amino acids are absorbed mainly in the jejunum and ileum of the small intestine.
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Match: Lacteal
- A. absorbs fat within the villi
- B. transports oxygen
- C. produces mucus
- D. secretes enzymes
Correct Answer: A
Rationale: Lacteals are lymphatic capillaries within the villi that absorb dietary fats.
Which enzyme works in highly acidic pH
- A. Pepsin
- B. Lipase
- C. Erepsin
- D. Amylopsin
Correct Answer: A
Rationale: Pepsin functions optimally in the highly acidic pH of the stomach (around 1.8-2).
In which order do these events occur in human nutrition?
- A. digestion→ ingestion→ absorption→ assimilation
- B. digestion→ ingestion→ assimilation→ absorption
- C. ingestion→ digestion→ absorption→ assimilation
- D. ingestion→ digestion→ assimilation→ absorption
Correct Answer: C
Rationale: Food is first ingested, then digested, absorbed into the bloodstream, and finally assimilated into cells.
Peyer's patches produce-
- A. Enterokinase
- B. Lymphocyte
- C. Mucous
- D. Trypsin
Correct Answer: B
Rationale: Peyer's patches in the small intestine produce lymphocytes, which are part of the immune system.
What are the substrate and end-products of digestion by the enzyme lipase?
- A. substrate: triglycerides, end-products: fatty acids and glycerol
- B. substrate: proteins, end-products: amino acids
- C. substrate: carbohydrates, end-products: monosaccharides
- D. substrate: nucleic acids, end-products: nucleotides
Correct Answer: A
Rationale: Lipase hydrolyzes triglycerides into their component fatty acids and glycerol.