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Question

Which of the following pairs of chemical substances, is correct categorization

A
Calcitonin and thymosin - thyroid hormones
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B
Pepsin and prolactin - two digestive enzymes secreted in stomach
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C
Troponin and myosin - complex proteins in striated muscles
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D
Secretin and rhodopsin - Polypeptide hormones
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Solution

The correct option is C Troponin and myosin - complex proteins in striated muscles
Troponin and myosin are complex proteins in striated muscles.
Thymosins are small proteins present in many animal tissues. They are named thymosins because they were originally isolated from the thymus.
Calcitonin is a hormone that is produced by the thyroid glands and reduces the calcium levels in the blood.
Pepsin is a digestive enzyme and helps in the breakdown of proteins. Prolactin enables mammals to produce milk and is not a digestive enzyme. Peptide hormones and protein hormones are hormones whose molecules are peptides or proteins.
Secretin is an example of a polypeptide hormone but Rhodopsin is a biological pigment found in the rods of the retina.

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