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Assertion (A) Receptor protein show sect...

Assertion (A) Receptor protein show sectivity for one chemical messenger over the other.
Reason (R) Chemical messenger binds to the receptor site and inhibits its natural function.

A

Assertion and reason both are correct statements but reason does not explain assertion.

B

Assertion and reason both are correct and reason explains the assertion.

C

Both assertion and reason are wrong statements.

D

Assertion is correct statement reason is wrong statement.

Text Solution

AI Generated Solution

The correct Answer is:
### Step-by-Step Solution: 1. **Understanding the Assertion (A)**: The assertion states that receptor proteins show selectivity for one chemical messenger over the other. This means that each receptor protein is designed to bind specifically to certain molecules (chemical messengers) and not to others. 2. **Analyzing the Reason (R)**: The reason provided states that a chemical messenger binds to the receptor site and inhibits its natural function. This suggests that the binding of any chemical messenger would prevent the receptor from performing its normal activity. 3. **Evaluating the Assertion**: - Receptor proteins indeed have specific binding sites that are shaped to fit only particular chemical messengers. This specificity is due to the unique structure and amino acid composition of the binding sites on the receptor proteins. Therefore, the assertion is **correct**. 4. **Evaluating the Reason**: - The reason is misleading. While it is true that some substances can bind to receptor sites and inhibit their function (these are often drugs known as antagonists), this does not apply to all chemical messengers. Many chemical messengers (like hormones or neurotransmitters) activate the receptor rather than inhibit it. Therefore, the reason is **incorrect**. 5. **Conclusion**: Since the assertion is correct and the reason is incorrect, the correct answer is that the assertion is true, but the reason is false. ### Final Answer: - Assertion (A) is correct. - Reason (R) is incorrect. - Therefore, the answer is option 4: Assertion is correct, Reason is incorrect.
### Step-by-Step Solution: 1. **Understanding the Assertion (A)**: The assertion states that receptor proteins show selectivity for one chemical messenger over the other. This means that each receptor protein is designed to bind specifically to certain molecules (chemical messengers) and not to others. 2. **Analyzing the Reason (R)**: The reason provided states that a chemical messenger binds to the receptor site and inhibits its natural function. This suggests that the binding of any chemical messenger would prevent the receptor from performing its normal activity. 3. **Evaluating the Assertion**: - Receptor proteins indeed have specific binding sites that are shaped to fit only particular chemical messengers. This specificity is due to the unique structure and amino acid composition of the binding sites on the receptor proteins. Therefore, the assertion is **correct**. ...
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