Question

Assertion (A): Hormone and its receptor protein together form a hormone receptor complex.
Reason (R): Hormone receptor complex generates biochemical changes in the target cells.

• A. Both A and R are correct and R is correct explanation of A
• B. Both A and R are correct but R is not correct explanation of A
• C. Both A and R are incorrect
• D. A is correct but R is incorrect

Hint:

Hormone action always requires specific receptor binding followed by signal transduction.

Answer 1

The Correct Option is A

Step 1: Understand hormone action.
Hormones are chemical messengers that bind to specific receptor proteins on target cells to initiate a response.

Step 2: Evaluate Assertion (A).
When a hormone binds with its specific receptor, a hormone–receptor complex is formed. Hence A is correct.

Step 3: Understand signal transduction.
This hormone–receptor complex activates intracellular signaling pathways leading to physiological responses.

Step 4: Evaluate Reason (R).
The complex indeed triggers biochemical changes in the target cell such as enzyme activation or gene expression. Hence R is correct.

Step 5: Check relationship.
R explains why hormone–receptor complex is important because its formation leads to cellular response.

Step 6: Conclusion.
Thus, both A and R are correct and R is the correct explanation of A.