Denaturation of proteins leads to the loss of their biological activity due to:

The most important energy source in every living cell is $......$.

Consider the following statements:
Statement-$I$: The primary structure of a protein represents its amino acid sequence.
Statement-$II$: The $\alpha$-helix and $\beta$-pleated sheet structures of a protein represent its tertiary structure.

What is the result of the hydrolysis of proteins by the enzyme pepsin?

When dilute $H_2SO_4$ is added to an alkaline solution of protein,a violet color is obtained. What is this test called?

Which of the following statements is/are true for amino acids?
$(A)$ The solubility of an amino acid in water is maximum at its isoelectric point $(pH)$.
$(B)$ It gives a ninhydrin test.
$(C)$ It releases nitrogen gas upon reaction with nitrous acid $(HNO_2)$.