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How Does Pepsinogen Change into Its Active Form - Biology

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प्रश्न

How does pepsinogen change into its active form?

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उत्तर १

Pepsinogen is a precursor of pepsin stored in the stomach walls. It is converted into pepsin by hydrochloric acid. Pepsin is the activated in the form of pepsinogen.

Pepsinogen  Pepsin + Inactive peptide

(Inactive) (Active)

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उत्तर २

The proenzyme pepsinogen, on exposure to hydrochloric acid, secreted by oxyntic cells of gastric glands gets converted into the active enzyme pepsin, the proteolytic enzyme of the stomach.

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  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 16: Digestion and Absorption - Exercises [पृष्ठ २६७]

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एनसीईआरटी Biology [English] Class 11
पाठ 16 Digestion and Absorption
Exercises | Q 3.4 | पृष्ठ २६७

संबंधित प्रश्‍न

Choose the correct answer among the following:

Gastric juice contains

 (i) pepsin, lipase and rennin

 (ii) trypsin lipase and rennin

 (iii) trypsin, pepsin and lipase

 (iv) trypsin, pepsin and renin


Answer briefly:

How does bile help in the digestion of fats?


Bile juice contains no digestive enzymes, yet it is important for digestion. Why?


Describe the digestive role of chymotrypsin. What two other digestive enzymes of the same category are secreted by its source gland?


What would happen if HCl were not secreted in the stomach?


Emulsification of fats is brought about by ______.


Mark the right statement among the following


Trypsinogen is an inactive enzyme of pancreatic juice. An enzyme, enterokinase, activates it. Which tissue/ cells secrete this enzyme?/ How is it activated?


Name the enzymes involved in the breakdown of nucleotides into sugars and bases?


Name the part of the alimentary canal where major absorption of digested food takes place. What are the absorbed forms of different kinds of food materials?


Correct the statement given below by the right option shown in the bracket against them.

Rennin is a proteolytic enzyme found in gastric juice in (infants/adults).


Correct the statement given below by the right option shown in the bracket against them.

Pancreatic juice and bile are released through. (intestine- pancreatic/hepato-pancreatic duct)


Correct the statement given below by the right option shown in the bracket against them.

Dipeptides, disaccharides and glycerides are broken down into simple substances in region of small intestine. (jejunum/duodenum)


How is the intestinal mucosa protected from the acidic food entering from stomach?


How are the activities of gastro-intestinal tract regulated?


Describe the enzymatic action on fats in the duodenum.


A person had roti and dal for his lunch. Trace the changes in those during its passage through the alimentary canal.


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