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Which one of the following pairs of chemical substances, is correctly categorised?

1.	Pepsin and prolactin - Two digestive enzymes secreted in the stomach
2.	Troponin and myosin - Complex proteins in striated muscles
3.	Secretin and rhodopsin - Polypeptide hormones
4.	Calcitonin and thymosin - Thyroid hormones

Subtopic: Skeletal Muscle: Myofilaments |

86%

Level 1: 80%+

AIPMT - 2012

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The contractile protein of skeletal muscle involving ATPase activity is:

1.	tropomyosin	2.	myosin
3.	α-actinin	4.	troponin

Subtopic: Skeletal Muscle: Myofilaments |

72%

Level 2: 60%+

AIPMT - 2006

Hints