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 11 of 34
- A. Calcium
- B. Vitamin D
- C. Vitamin A
- D. Vitamin K
Explanation: E. coli benefits its host in several ways. It produces vitamin K and vitamin B12, both of which are required by mammalian hosts.
Correct answer: Vitamin K- A. Gastrin
- B. Hydrochloric acid
- C. Pepsinogen
- D. Mucus
Explanation: The primary function of goblet cells is to secrete mucin and create a protective mucus layer.
Correct answer: Mucus- A. Two
- B. Three
- C. Four
- D. Five
Explanation: The gastric glands are glands in the lining of the stomach that play an essential role in the process of digestion.
Correct answer: Four- A. Chief cells
- B. Oxyntic cells
- C. Mucous cells
- D. Kupffer cells
Explanation: Oxyntic cells (parietal calls) are large and are most numerous on the side walls of the gastric glands.
Correct answer: Oxyntic cells- A. Vitamin K
- B. Vitamin C
- C. Vitamin A
- D. Vitamin D
Explanation: Vitamin K is majorly synthesized by intestinal microflora. Vitamin K is produced by the microflora (bacteria) present in the large…
Correct answer: Vitamin K- A. Water and Salts
- B. Water and Peptones
- C. Salts and glycerol
- D. Amino acids and Sugars
Explanation: The large intestine absorbs water and salts from food waste, turning it into stool.
Correct answer: Water and Salts- A. Sodium bicarbonate
- B. Sodium chloride
- C. Sodium hydroxide
- D. Hydrocarbons
Explanation: Saliva contains sodium bicarbonate, which helps to maintain the pH balance in the mouth.
Correct answer: Sodium bicarbonate- A. Predation
- B. Symbiosis
- C. Mutualism
- D. Parasitism
Explanation: Mycorrhizae are a symbiotic association between fungi and plant roots where the plant roots provide the fungus with favourable conditions…
Correct answer: Mutualism- A. Commensalism
- B. Parasitism
- C. Mutualism
- D. Predation
Explanation: Mutualism is a form of a symbiotic relationship where all involved species benefit from their interactions with one another.
Correct answer: Mutualism- A. Duodenum
- B. Caecum
- C. Kidney
- D. Rectum
Explanation: The vermiform appendix is a blind-end structure that extends from the caecum(the first part of the large intestine).
Correct answer: Caecum- A. Parietal cells
- B. Oxyntic cells
- C. Zymogen cells
- D. Both Parietal cells and Oxyntic cells
Explanation: Parietal cells are epithelial cells in the stomach that secrete hydrochloric acid(HCl) and intrinsic factors.
Correct answer: Both Parietal cells and Oxyntic cells- A. Large intestine
- B. Small intestine
- C. kidney
- D. Duodenum
Explanation: The ileum which is part of the small intestine is involved in the absorption of digested food.
Correct answer: Small intestine- A. To act as antiseptic
- B. To stabilize the pH of food
- C. To act as lubricant
- D. To make a slimy food
Explanation: Sodium bicarbonate (NaHCO3) is present in saliva. It acts as a mild antiseptic but its major function is to stabilize the pH of the food…
Correct answer: To stabilize the pH of food- A. Starch in duodenum
- B. Proteins in stomach
- C. Proteins in duodenum in acidic medium
- D. Proteins in duodenum in alkaline medium
Explanation: Chymotrypsin is a digestive enzyme of pancreatic juice acting on the duodenum to breakdown protein in an alkaline medium.
Correct answer: Proteins in duodenum in alkaline medium- A. Pepsin
- B. Thrombin
- C. Ptyalin
- D. Fumarase
Explanation: Amylase is the enzyme in saliva that digests starch and ptyalin is an amylase
Correct answer: Ptyalin- A. Amylase
- B. Ptyalin
- C. Lingual lipase
- D. Both Amylase and Ptyalin
Explanation: The von Ebner glands, also known as serous glands, are minor salivary glands located on both sides of your oral cavity toward the back of…
Correct answer: Lingual lipase- A. Capillaries
- B. Lacteals
- C. Both A and B
- D. None of the above options are correct
Explanation: Amino acids are absorbed by intestinal epithelial cells in the capillaries and released into the blood.
Correct answer: Capillaries- A. Magnesium
- B. Nitrogen
- C. Carbon
- D. Oxygen
Explanation: Carnivorous Plants- These plants have evolved the ability to trap and digest insects, which are an excellent source of nitrogen as they…
Correct answer: Nitrogen- A. Magnesium or nitrogen
- B. Carbon or Hydrogen
- C. Magnesium or iron
- D. Bright sunlight
Explanation: Magnesium and nitrogen are the main components of chlorophyll. Deficiency of these elements would therefore result in chlorosis.
Correct answer: Magnesium or nitrogen- A. Nutrients
- B. Decomposers
- C. Enzymes
- D. Stiff hair
Explanation: The rim of its pitcher's opening (the peristome) is particularly pronounced (both secrete nectar) and provides a thorny overhang to the…
Correct answer: Stiff hair