The following is a scheme showing the fate of carbohydrate during digestion in the human alimentary canal. Identify the enzymes acting at stages indicated as a, b, c and d. Choose the correct option from those given.

a = amylase, b = maltase, c = lactase, d = invertase

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a = amylase, b = maltase, c = invertase, d = lactase

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a = amylase, b = invertase, c = maltase, d = lactase

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a = amylase, b = lactase, c = maltase, d = invertase

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Solution

The correct option is D a = amylase, b = lactase, c = maltase, d = invertase
An amylase is an enzyme that catalyses the hydrolysis of starch into sugars. Amylase is present in the saliva of humans and some other mammals, where it begins the chemical process of digestion. Lactase is an enzyme produced by many organisms. It is located in the brush border of the small intestine of humans and other mammals. Lactase is essential to the complete digestion of whole milk. It breaks down lactose, a sugar which gives milk its sweetness. Invertase is an enzyme that catalyzes the hydrolysis (breakdown) of sucrose (table sugar). Maltase is an enzyme located in on the brush border of the small intestine that breaks down the disaccharide maltose. Maltase catalyzes the hydrolysis of maltose to the simple sugar glucose.
Therefore, the correct answer is option D.

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How many enzymes in the list given below are found in intestinal juice?

Trypsin, Pepsin, Sucrase, Lactase, Rennin, Carboxypeptidase, Nuclease, Dipeptidase, Maltase, Enterokinase

Q. Enzymatic reactions are given in Column I and enzymes in Column II.

Column I	Column II
$(A)$ Maltose $\to$ Glucose	$(i)$ Zymase
$(B)$ Sucrose $\to$ Glucose $+$ Fructose	$(i i)$ Pepsin
$(C)$ Glucose $\to$ Ethyl alcohol $+ C O_{2}$	$(i i i)$ Maltase
$(D)$ Starch $\to$ Maltose	$(i v)$ Invertase
$(E)$ Proteins $\to$ Amino acids	$(v)$ Diastase

Choose the correct matching of enzymatic reaction and enzyme that catalyses the correct reaction from the codes given below.

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