Which of the following statements is not corr | vedclass

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(C) $1$. At the isoelectric point $(pI)$,the amino acid exists as a zwitter ion,meaning it has a net charge of zero. This statement is correct.$2$. Wh

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Primary,secondary,and tertiary structures of proteins are denatured by heating.

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(C) $1$. At the isoelectric point $(pI)$,the amino acid exists as a zwitter ion,meaning it has a net charge of zero. This statement is correct.$2$. When $pH > pI$,the amino acid exists as an anion (negatively charged) and will move towards the anode (positive electrode) in an electric field. This statement is correct.$3$. Denaturation of proteins involves the loss of secondary and tertiary structures due to physical changes like heating or chemical changes. However,the primary structure (the sequence of amino acids) remains intact. Therefore,the statement that primary structures are denatured by heating is incorrect.$4$. Glycine is the simplest $\alpha$-amino acid and is optically inactive. Alanine is the next simplest and is the first optically active $\alpha$-amino acid. This statement is correct.

Which of the following statements is not correct?

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