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 6 of 34
- A. Amino peptidase
- B. Erypsin
- C. Pepsin
- D. Trypsin
Explanation: Erepsin is a mixture of intestinal peptidases that breaks dipeptides into amino acids at the intestinal surface.
Correct answer: Erypsin- A. Mucous cells
- B. Parietal cells
- C. Zymogen cells
- D. All of these
Explanation: Pepsinogen is an inactive digestive enzyme released by zymogen, or chief, cells in the gastric glands.
Correct answer: Zymogen cells- A. 2-4 hours
- B. 6-8 hours
- C. 10-12 hours
- D. 12-24 hours
Explanation: Hunger pangs are rhythmic stomach contractions that commonly become noticeable about 12 to 24 hours after the previous meal, especially…
Correct answer: 12-24 hours- A. Gastric juice
- B. Pancreatic juice
- C. Bile
- D. All of these
Explanation: Secretin is released by the duodenum when acidic chyme enters it, and it reduces gastric activity while promoting pancreatic bicarbonate…
Correct answer: Gastric juice- A. Flatworm
- B. Pinworm
- C. Hook worm
- D. Tapeworm
Explanation: Enterobius vermicularis is the intestinal nematode commonly called the pinworm or threadworm.
Correct answer: Pinworm- A. Sublingual
- B. Submaxillary
- C. Submandibular
- D. Parotid
Explanation: The parotid glands lie on the sides of the face, just in front of and below each ear, and release saliva through Stensen's ducts.
Correct answer: Parotid- A. 5.3
- B. 5.6
- C. 7.3
- D. 7.6Standardized & Admissions Tests
Explanation: The newly formed food vacuole in Amoeba is commonly described as having an initially acidic pH of about 5.6, which supports the activity…
Correct answer: 5.6- A. Hepatitis
- B. Jaundice
- C. Gall stones
- D. Blockage
Explanation: Bile pigments normally leave the body with the faeces, but their accumulation in blood and tissues produces the yellow discoloration…
Correct answer: Jaundice- A. Parotid
- B. Submandibular
- C. Sublingual
- D. None of the given options are correct.
Explanation: Amylase is not produced by the sublingual salivary glands.The sublingual glands are one of the major salivary glands located beneath the…
Correct answer: Sublingual- A. Ammonia
- B. Nitrite
- C. Nitrate
- D. Amino acid
Explanation: The symbiotic nitrogen-fixing bacteria invade the root hairs of host plants, where they convert free nitrogen to ammonia, which the host…
Correct answer: Ammonia- A. Kangaroo rat
- B. Pig
- C. Kangaroo
- D. Camel
Explanation: The kangaroo rat is almost perfectly adapted to life in the desert. They can survive without ever drinking any water, getting needed…
Correct answer: Kangaroo rat- A. Proteins
- B. Fats
- C. Carbohydrates
- D. Vitamins
Explanation: Mechanical and chemical digestion begins in the mouth with the chewing of food and the release of saliva, which starts carbohydrate…
Correct answer: Carbohydrates- A. Potassium - Formation of cell wall.
- B. Magnesium - Constituent of chlorophyll.
- C. Nitrogen - Constituent of protein.
- D. Phosphorus - Component of nucleic acid.
Explanation: •The plant cell wall is made of Cellulose.•Potassium creates the cell membrane potential which allows the cell to generate an action…
Correct answer: Potassium - Formation of cell wall.- A. Proteins and carbohydrates
- B. Fats and proteins
- C. Fats and carbohydrates
- D. Vitamins and fats
Explanation: 'Chylomicrons' are a type of lipoprotein. As the name suggests, lipo- means lipids and proteins.
Correct answer: Fats and proteins- A. Cellular anaerobe
- B. Respiratory anaerobe
- C. Obligate anaerobe
- D. Facultative anaerobe
Explanation: Facultative anaerobes are bacteria that can grow in both the presence or absence of oxygen.
Correct answer: Facultative anaerobe- A. Trachea
- B. NG tube
- C. Nerve canal
- D. Esophagus
Explanation: Esophagus: An organ in vertebrates that consists of a muscular tube through which food passes from the pharynx to the stomach.
Correct answer: Esophagus- A. Botulism
- B. Anorexia nervosa
- C. Obesity
- D. Bulemia nervosa
Explanation: Anorexia nervosa is an eating disorder characterized by an abnormally low body weight, an intense fear of gaining weight and a distorted…
Correct answer: Anorexia nervosa- A. 3.5 and 7.7 respectively
- B. 1.8 and 6.8 respectively
- C. 6.8 and 7.4 respectively
- D. 1.8 and 7.4 respectively
Explanation: The stomach has a pH between 1.5 and 3.5 generally and this is due to the cells in the stomach releasing hydrochloric acid, this is where…
Correct answer: 1.8 and 6.8 respectively- A. Peristalsis
- B. Epiglottis
- C. Antiperistalsis
- D. Anus
- E. None of these options
Explanation: Peristalsis is the contraction of muscle tissue that helps move and break down foodstuffs.
Correct answer: Peristalsis- A. 3.6 centimeters
- B. 3.6 mllimeters
- C. 3.6 inches
- D. 3.6 meters
- E. 3.6 klometers
Explanation: The ileum is about 3.6 meters (11.5 feet) long (or about three-fifths the length of the small intestine) and extends from the jejunum (the…
Correct answer: 3.6 meters