Question

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

• A. Pepsin and prolactin - Two digestive enzymes secreted in stomach
• B. Troponin and myosin - Complex proteins in striated muscles
• C. Secretin and rhodopsin - Polypeptide hormones
• D. Calcitonin and thymosin - Thyroid hormones

Answer 1

The correct option is B Troponin and myosin - Complex proteins in striated muscles

Troponin is a complex of three regulatory proteins that is integral to muscle contraction in skeletal muscle and cardiac muscle, but not smooth muscle.

Myosins are motor proteins best known for their roles in muscle contraction and in a wide range of other motility processes.

So, the correct answer is 'troponin and myosin-complex proteins in striated muscles'