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Digestion of Nutrients

A child eats ...

Question

A child eats his lunch made of rice, vegetables and pulses. Regarding this which of the following match is incorrect? Substrate of enzyme Enzyme Site of Secretion Products formed

I. Starch Salivary amylase Salivary gland Maltose, Dextrin

II. Proteins Pepsin Stomach Large peptides

III. Lipase Enterokinase Small intestine Fatty acids

IV. Nucleic acids Nucleases Pancreas Nucleotides

A

I

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B

II

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C

III

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D

IV

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Solution

The correct option is C III
Lipase is not substrate, it is an enzyme that acts on lipids. Enterokinase does not play a role in fat digestion.

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Q. A child eats his lunch made of rice, vegetables and pulses. Regarding this which of the following match is incorrect? Substrate of enzyme Enzyme Site of Secretion Products formed

I.	Starch	Salivary amylase	Salivary gland	Maltose, Dextrin
II.	Proteins	Pepsin	Stomach	Large peptides
III.	Lipase	Enterokinase	Small intestine	Fatty acids
IV.	Nucleic acids	Nucleases	Pancreas	Nucleotides

Q. Which of the following is the correct matching of the site of action on the given substrate, the enzyme acting upon it and the end product?
(i) Small intestine: Protein

P e p s i n - --- \to

Amino acid
(ii) Stomach : Fat

L i p a s e - --- \to

Micelles
(iii) Duodenum : Triglycerides

T r y p s i n - ---- \to

Monoglyceride
(iv) Buccal cavity : Starch

A m y l a s e - ---- \to

Disaccharide
(v) Jejunum: Peptones

P e p s i n - --- \to

Amino acid
(vi) Buccal cavity : Starch

A m y l o g l y c e r a t e - -------- \to

Q. Which of the following statements are correct?
A. The chemical process of digestion is initiated in oral cavity by the hydrolytic action of the carbohydrate
splitting enzyme, the salivary amylase.
B. Lipases are absent in secretion of gastric glands.
C. Bile helps in emulsification of fats.
D. Nucleases in the succus entericus acts on nucleic acids to form nucleotides and nucleosides.

Q. A child took sugarcane and sucked its juice. Regarding this which of the following match is correct?
Substrate Enzyme Site of secretion of enzyme Products formed

Q. In the process of digestion, the enzymes 'X' in the salivary gland and 'Y' in the pancreas are such that 'X' converts starch into maltose and 'Y' converts proteins to amino acids. Identify X and Y.

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