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Which of the following are the key enzymes of the intestines? (Select all that apply)

A.

Lactase

B.

Peptidases

C.

Sucrase

D.

Maltase

E.

Amylase

Answer and Explanation

Correct Answer : A,B,C,D

A. Lactase

Lactase breaks down lactose (milk sugar) into glucose and galactose in the small intestine.

B. Peptidases

Peptidases break down peptides into amino acids in the small intestine.

C. Sucrase

Sucrase breaks down sucrose into glucose and fructose in the small intestine.

D. Maltase

Maltase breaks down maltose into two glucose molecules, functioning in the small intestine.

E. Amylase

While amylase breaks down starches, it is primarily produced in the salivary glands and pancreas, not the intestinal lining.


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Related Questions

Correct Answer is D

Explanation

A. It produces digestive enzymes

While the duodenum may activate enzymes, it does not produce major digestive enzymes itself. Most digestive enzymes come from the pancreas and intestinal glands.

B. It receives secretions from the liver, gallbladder, and pancreas

The duodenum is the first part of the small intestine and receives bile from the liver and gallbladder and digestive enzymes from the pancreas, making it a central site for digestive processes to begin in earnest.

C. It is part of the large intestine

The duodenum is part of the small intestine, not the large intestine.

D. It has villi and microvilli

While the duodenum does have villi, this feature is not unique to it—all segments of the small intestine have villi. This is not the reason it is considered the "meeting point" for digestion.

Correct Answer is A

Explanation

A. Micronutrients

Vitamins and minerals are needed in small amounts and are classified as micronutrients, essential for various body functions.

B. Carbohydrates

Carbohydrates are a type of macronutrient that provide energy, not micronutrients.

C. Macronutrients

Macronutrients include carbohydrates, proteins, and fats—nutrients needed in large amounts, unlike vitamins and minerals.

D. Non-essential

Vitamins and minerals are essential nutrients that the body cannot produce in sufficient quantities on its own.

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