MCQ 111:
What is the primary function of the gallbladder?
A) To produce bile
B) To store bile
C) To secrete enzymes
D) To absorb nutrients
Answer: B) To store bile
Explanation: The gallbladder stores bile produced by the liver until it is needed for digestion in the small intestine.
MCQ 112:
Which part of the digestive system is primarily involved in the absorption of alcohol?
A) Stomach
B) Small intestine
C) Large intestine
D) Esophagus
Answer: A) Stomach
Explanation: Although alcohol is absorbed in both the stomach and small intestine, significant absorption occurs in the stomach.
MCQ 113:
What are the end products of protein digestion?
A) Glucose
B) Fatty acids
C) Amino acids
D) Nucleotides
Answer: C) Amino acids
Explanation: The end products of protein digestion are amino acids, which are absorbed into the bloodstream.
MCQ 114:
Which digestive enzyme is secreted in its inactive form?
A) Amylase
B) Pepsinogen
C) Lipase
D) Lactase
Answer: B) Pepsinogen
Explanation: Pepsinogen is secreted as an inactive precursor and is activated to pepsin in the acidic environment of the stomach.
MCQ 115:
Which of the following is NOT a function of the liver?
A) Producing bile
B) Metabolizing drugs
C) Absorbing nutrients
D) Storing vitamins
Answer: C) Absorbing nutrients
Explanation: The liver does not absorb nutrients; instead, it processes nutrients absorbed from the digestive tract.
MCQ 116:
Which of the following nutrients is primarily absorbed in the jejunum?
A) Proteins
B) Fats
C) Carbohydrates
D) All of the above
Answer: D) All of the above
Explanation: The jejunum is the part of the small intestine where the majority of nutrients, including proteins, fats, and carbohydrates, are absorbed.
MCQ 117:
Which digestive enzyme acts on nucleic acids?
A) Amylase
B) Pepsin
C) Nuclease
D) Lipase
Answer: C) Nuclease
Explanation: Nuclease is the enzyme that breaks down nucleic acids (DNA and RNA) into nucleotides.
MCQ 118:
What is the primary function of bile salts in digestion?
A) Emulsifying fats
B) Digestion of proteins
C) Absorbing carbohydrates
D) Breaking down nucleic acids
Answer: A) Emulsifying fats
Explanation: Bile salts emulsify fats, increasing their surface area for digestion by lipase enzymes.
MCQ 119:
Which of the following organs is NOT part of the digestive tract?
A) Stomach
B) Pancreas
C) Small intestine
D) Esophagus
Answer: B) Pancreas
Explanation: The pancreas is an accessory organ that produces digestive enzymes but is not part of the digestive tract itself.
MCQ 120:
What condition is characterized by the inability to digest lactose?
A) Lactose intolerance
B) Celiac disease
C) Gallstones
D) Peptic ulcer
Answer: A) Lactose intolerance
Explanation: Lactose intolerance occurs when the body lacks sufficient lactase to break down lactose, leading to digestive issues.
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