Nokea
Which of these is not a carbohydrate?
- A. sugar
- B. starch
- C. fat
- D. cellulose
Correct Answer: C
Rationale: Fat is a lipid, not a carbohydrate, unlike sugar, starch, and cellulose.
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Emulsification of fats by bile takes place in-
- A. Duodenum
- B. Liver
- C. Stomach
- D. Intestine
Correct Answer: A
Rationale: Bile emulsifies fats in the duodenum, the first part of the small intestine.
Which of the following structures is a common passageway for both food and air?
- A. Nasopharynx
- B. Oropharynx
- C. Esophagus
- D. Trachea
Correct Answer: B
Rationale: The oropharynx serves as a common pathway for food (to the esophagus) and air (to the laryngopharynx and trachea), unlike the other options.
Disaccharides are digested by
- A. secretin
- B. disaccharidase
- C. lipase
- D. pepsin
Correct Answer: B
Rationale: Disaccharidases, such as sucrase, lactase, and maltase, digest disaccharides into monosaccharides for absorption.
Which of the following digestive enzymes is NOT found in intestinal juice?
- A. erepsin
- B. trypsin
- C. amylase
- D. maltase
Correct Answer: B
Rationale: Trypsin is produced by the pancreas and secreted into the duodenum, not found in intestinal juice, which contains enzymes like erepsin and maltase.
Each part of the alimentary canal has the optimum pH for the enzymes that digest food there. What is the optimum pH for an enzyme that works in the stomach?
- A. pH 2
- B. pH 7
- C. pH 9
- D. pH 12
Correct Answer: A
Rationale: The stomach's acidic environment (around pH 2) is optimal for the function of pepsin, which breaks down proteins.