Question

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

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

Answer 1

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

Troponin and myosin are the proteins of striated muscles. They help in muscle contraction.

Thymosin is the hormone released from thymus and helps in stimulating the growth of certain immune cells. Calcitonin is also a hormone released from parafollicular cells of the thyroid gland.

Prolactin is a hormone released by the pituitary gland. Pepsin is a protein-digesting hormone secreted in the stomach.

Rhodopsin is a derivative of vitamin D. Secretin a hormone released into the bloodstream by the duodenum (especially in response to acidity) to stimulate secretion by the liver and pancreas.

So the correct option is C.