Question

Which among the following is correctly categorized?

• A. Troponin and Myosin $\to$ Complex proteins in striated muscles
• B. Calcitonin and Thymosin $\to$ Thyroid hormones
• C. Pepsin and Prolactin $\to$ Digestive enzymes secreted in stomach
• D. Secretin and Rhodopsin $\to$ Polypeptide hormones

Answer 1

The correct option is A Troponin and Myosin $\to$ Complex proteins in striated muscles

1. The various complex proteins involved in muscle contraction are actin and myosin along with troponin and tropomyosin.
2. Thyroid hormones are triiodothyronine (T3) and Tetraiodothyronine (T4) which help in regulating the Basal Metabolic Rate of the body.
3. Pepsin is a protein digestive enzymes secreted in the stomach but prolactin is a hormone secreted by the anterior pituitary.
4. Secretin is a polypeptide hormone which functions to regulate pH of the stomach by inhibiting gastric acid secretion but rhodopsin is the visual pigment present in our eyes and a G protein-coupled-receptor.

So, the correct option is

'Troponin and Myosin → Complex proteins in striated muscles'.