Nokea
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.
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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.
What happens during the oral phase of digestion?
- A. Food is chewed and mixed with saliva
- B. Chyme is formed with gastric juice
- C. Nutrients are absorbed
- D. Waste is expelled
Correct Answer: A
Rationale: In the oral phase, food is mechanically broken down by chewing and mixed with saliva to begin starch digestion.
Which process is stimulated by adrenaline in the cells of the liver?
- A. breakdown of glycogen, increasing the blood glucose level
- B. breakdown of excess amino acids, forming urea
- C. breakdown of proteins, releasing amino acids into the blood
- D. conversion of excess blood glucose to glycogen
Correct Answer: A
Rationale: Adrenaline stimulates glycogenolysis in the liver, breaking down glycogen into glucose to increase blood glucose levels.
Which of the following enzymes formed in the pancreas aids in protein digestion?
- A. Amylase
- B. Lipase
- C. Trypsinogen
- D. Trypsin
Correct Answer: D
Rationale: Trypsin, activated from trypsinogen, is a pancreatic enzyme that digests proteins.
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.