1
Question
The initial step in digestion of milk in humans is carried out by ________.
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Solution
The correct option is C Rennin
- Rennin helps in the digestion of milk protein casein. It is secreted in infants. It is present as a zymogen (inactive precursor of
enzymes) in the stomach. In the presence of hydrochloric acid, pro-rennin is
converted into rennin. By the action of rennin, casein breaks down to
para-casein. Para-casein reacts with the calcium to form calcium
para-caseinate. This is known as the curdling of milk.
- Trypsin and pepsin help in the digestion of protein.
- Lipase helps in the digestion of fats.
Hence, the correct
answer is option (B).
- Rennin helps in the digestion of milk protein casein. It is secreted in infants. It is present as a zymogen (inactive precursor of enzymes) in the stomach. In the presence of hydrochloric acid, pro-rennin is converted into rennin. By the action of rennin, casein breaks down to para-casein. Para-casein reacts with the calcium to form calcium para-caseinate. This is known as the curdling of milk.
- Trypsin and pepsin help in the digestion of protein.
- Lipase helps in the digestion of fats.
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