Food tests were carried out on four different substances. Which substance contained both protein and reducing sugar?
- A. substance A
- B. substance B
- C. substance C
- D. substance D
Correct Answer: A
Rationale: Substances testing positive for both the biuret test (protein) and Benedict's test (reducing sugar) indicate the presence of both protein and reducing sugars.
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The pancreas makes the following hormones:
- A. Oestrogen and progesterone
- B. Insulin and Glucagon
- C. Testosterone and Oestrogen
- D. Anti Diuretic Hormone and adrenalin
Correct Answer: B
Rationale: The pancreas produces insulin and glucagon to regulate blood sugar.
Match: Bile
- A. breaks fat into smaller droplets
- B. digests carbohydrates
- C. absorbs vitamins
- D. neutralizes stomach acid
Correct Answer: A
Rationale: Bile emulsifies fats, breaking them into smaller droplets to facilitate digestion by lipases.
Amylase enzyme acts on which substrate ______________.
- A. Protein.
- B. Carbohydrates.
- C. Fatty acids.
- D. Fat.
Correct Answer: B
Rationale: Amylase is an enzyme that breaks down carbohydrates into simpler sugars like maltose and dextrin.
All enzymes involved in protein digestion are:
- A. secreted by the pancreas
- B. activated by HCl
- C. present in the stomach
- D. secreted in an inactive form
Correct Answer: D
Rationale: Protein-digesting enzymes like pepsinogen and trypsinogen are secreted in an inactive form and activated later.
Which layer of GI tract forms the innermost lining and continuously secretes mucus?
- A. serosa
- B. muscularis externa
- C. muscularis mucosa
- D. mucosa
Correct Answer: D
Rationale: The mucosa is the innermost layer of the GI tract, lined with epithelial cells that secrete mucus to protect the tract and lubricate food passage.