A: Tertiary structure of protein is absolutel | vedclass

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(B) $1$. The tertiary structure of a protein is essential for its biological activity because it creates the specific three-dimensional shape, includi

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Assertion and Reason both are correct but Reason is not the correct explanation of Assertion.

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(B) $1$. The tertiary structure of a protein is essential for its biological activity because it creates the specific three-dimensional shape, including the active site in enzymes, required for its function.$2$. According to the $NCERT$ textbook, it is stated that in proteins, only right-handed helices are observed due to steric constraints.$3$. Therefore, both the Assertion and the Reason are correct, but the Reason does not explain why the tertiary structure is necessary for biological activity. Thus, option $B$ is correct.

$A$: Tertiary structure of protein is absolutely necessary for many biological activities of proteins.
$R$: In proteins, only right-handed helices are observed.

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$A$: Tertiary structure of protein is absolutely necessary for many biological activities of proteins.$R$: In proteins, only right-handed helices are observed.