Which of the following pairs of chemical substances is correctly categorized?

Pepsin and prolactin - two digestive enzymes secreted in stomach

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Troponin and myosin - complex proteins in striated muscles

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Secretin and rhodopsin - polypeptide hormones

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Calcitonin and thymosin - protease enzyme

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Solution

The correct option is A Troponin and myosin - complex proteins in striated muscles
Pepsin is digestive enzyme secreted in stomach, while prolactin also known as luteotropin, is a protein and it is known for its role in enabling females to produce milk.
Secretin is a polypeptide hormone that regulates water homeostasis, while rhodopsin belongs to G-protein coupled receptor family.
Troponin and myosin are complex regulatory proteins in skeletal muscle fibers.
So, the correct answer is option B.

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a.	Insulin and glucagon	-	Secreted from the endocrine region of pancreas
b.	Emulsification	-	Breaking of fat molecules into fatty acid and glycerol
c.	Trypsin	-	Protein digestive enzyme present in bile
d.	Succus entericus	-	Helps in the complete digestion of proteins, carbohydrates and fats

e n z y m e (A) - ----- \to

e n z y m e (B) - ------ \to

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