Free Digestion MCQs with Answers
680 Digestion MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
The human digestive system covers the organs from mouth to anus, the movement of food, and the mechanical and chemical breakdown of carbohydrates, proteins and fats. It also includes the roles of digestive enzymes, bile, absorption through intestinal villi, and the assimilation of nutrients by body cells.
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Read the Digestion notesFree MDCAT chapter notes with key terms680 questions · page 32 of 34
- A. Monosaccharide form
- B. Oligosaccharide form
- C. Polysaccharide form
- D. All given options
Explanation: Amylase is found in saliva and breaks starch into maltose and dextrin, an oligosaccharide.
Correct answer: Oligosaccharide form- A. 3
- B. 7
- C. 8
- D. 12
- E. 13
Explanation: In the mouth, as the chewing begins, saliva is released which has the amylase enzyme. The amylase starts breaking down starch to maltose.
Correct answer: 3- A. Vitamin B12 absorption
- B. Protein digestion
- C. Carbohydrate breakdown
- D. Bowel movement
Explanation: Intrinsic factor plays a crucial role in the transportation and absorption of the vital micronutrient vitamin B12.
Correct answer: Vitamin B12 absorption- A. Sensation of taste
- B. Smell of food
- C. Presence of protein food in stomach
- D. Sight of food
Explanation: Presence of proteins in the stomach activates parietal cells to secrete gastric juice.
Correct answer: Presence of protein food in stomach- A. Glycogenolysis
- B. Gluconeogenesis
- C. Deamination
- D. Immunoglobulin synthesis
Explanation: Metabolic role of liver includes Glycogenolysis (conversion of glycogen to glucose), Gluconeogenesis(formation of glucose from…
Correct answer: Immunoglobulin synthesis- A. Lipase
- B. Trypsin
- C. Pepsin
- D. Amylase
Explanation: Pancreatic juice contains Lipase, Trypsin, and Amylase. Thus it does not contain Pepsin and Option C is the correct answer.
Correct answer: Pepsin- A. Protein digestion
- B. HCl secretion
- C. Protein absorption
- D. HCl inhibition
Explanation: Parietal cells are responsible for HCl secretion, which aids in the digestion of food, absorption of minerals, and control of harmful…
Correct answer: HCl secretion- A. Absorption of electrolytes.
- B. Absorption of water
- C. Production of vitamins
- D. Absorption of amino acids
Explanation: Absorption of nutrients occurs in the small intestine. The nutrients are absorbed through the villi of the small intestine.
Correct answer: Absorption of amino acids629. The following part Is common in both the digestive system and respiratory systems of human beings:
- A. Trachea
- B. Pharynx
- C. Larynx
- D. Oesophagus
Explanation: The pharynx is part of two body systems (the respiratory system and the digestive system) because it carries both air and food.
Correct answer: Pharynx- A. Pepsin
- B. Sucrose
- C. Enterokinase
- D. Pancreatic lipase
Explanation: The function of the pancreatic juice is to digest and break down large sugars, fats, and starches into smaller assimilable molecules.
Correct answer: Pancreatic lipase- A. Amylase
- B. Erypsin
- C. Lactase
- D. Carboxypeptidase
Explanation: Amylase is produced mostly in the pancreas, but also in the salivary glands and small intestine.
Correct answer: Amylase- A. Oxyntic cells
- B. Chief cells
- C. Mucus cells
- D. Endocrine cells
Explanation: Gastric chief cells secrete pepsin as an inactive zymogen called pepsinogen.
Correct answer: Chief cells- A. Proteolytic enzyme action
- B. Dissolving in mucus
- C. Hormonal action
- D. Hydrochloric acid
Explanation: Pepsinogen is converted into pepsin by hydrochloric acid.
Correct answer: Hydrochloric acid- A. Proteins
- B. Fats
- C. Carbohydrates
- D. Vitamins
Explanation: Digestion of carbohydrates begins in the oral cavity with the action of salivary amylase.
Correct answer: Carbohydrates- A. Trypsin
- B. Pepsin
- C. Protease
- D. All of these
Explanation: The enzymes mentioned above, are the enzymes that break down protein into simpler forms.
Correct answer: All of these- A. Cardiac Sphincter
- B. Esophageal Sphincter
- C. Ileocolic Sphincter
- D. Pyloric Sphincter
Explanation: Explanation:The junction between esophagus and stomach is known as cardiac sphincter.
Correct answer: Cardiac Sphincter- A. Enterokinase
- B. Chyme
- C. Lipase
- D. Erypsin
Explanation: Explanation:Like Pepsin, trypsin is also secreted as inactive trypsinogen, which is activated by enterokinase.
Correct answer: Enterokinase- A. Digestion of triglycerides
- B. Digestion of lipids
- C. Digestion of all types of food
- D. Digestion of carbohydrates
Explanation: Option [A] Gastric Lipase breaks down fats in the stomach.Option [B] Lipase breaks down Lipids into fatty acids and glycerol.Option[C]…
Correct answer: Digestion of carbohydrates- A. At the junction of esophagus and stomach
- B. At the junction of stomach and small intestine
- C. At the junction of ileum and large intestine
- D. At the junction of small intestine and large intestine
Explanation: Option[A] cardiac sphincter is present at the junction of esophagus and stomach.Option[B] pyloric sphincter is present at the junction of…
Correct answer: At the junction of ileum and large intestine- A. Obesity
- B. Anorexia nervosa
- C. Dyspepsia
- D. Bulimia nervosa
Explanation: Option[a] Obesity is defined as the accumulation of abnormal or excessive fat that may impair health.Option [b] Anorexia nervosa is an…
Correct answer: Anorexia nervosa