Rennin acts on:

Proteins in stomach

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Milk; changing casein into paracaseinate at 7.2 - 8.2 pH

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Fats in intestine

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Milk; changing casein into calcium paracaseinate at 1-3 pH

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Solution

The correct option is D Milk; changing casein into calcium paracaseinate at 1-3 pH
Gastric juice is a mixture of hydrochloric acid, pepsin and rennin enzymes and is synthesized and secreted from gastric (oxyntic) glands situated in the wall of the stomach. Gastric juice is highly acidic with a pH value of pure secretion being 1.0 due to a very high concentration of hydrochloric acid. After mixing with food, the pH of gastric contents becomes approximately 2.5 which is suitable for the digestion of proteins in the stomach. Rennin enzyme causes curdling of milk by converting casein (milk protein) into calcium paracaseinate.

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Similar questions

Identify the steps (denoted by numerals) in physiology of digestion in stomach.

i).Food $H C l ⟶ K i l l s B a c t e r i a$ Chyme

ii).Pepsinogen Prorennin $H C l ⟶ A c t i v a t i o n$ Pepsin Rennin

iii).Proteins $P e p s i n ⟶$ Proteases Peptones

iv).Milk Casein $R e n n i n ⟶$ Para casein $C a l c i u m ⟶$ Calcium paracaseinate

Identify the steps (denoted by numerals) in physiology of digestion in stomach.

i).Food $H C l ⟶ K i l l s B a c t e r i a$ Chyme

ii).Pepsinogen Prorennin $H C l ⟶ A c t i v a t i o n$ Pepsin Rennin

iii).Proteins $P e p s i n ⟶$ Proteases Peptones

iv).Milk Casein $R e n n i n ⟶$ Para casein $C a l c i u m ⟶$ Calcium paracaseinate

Y \to

Z \to

An enzyme that converts casein to paracasein

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