The $\alpha$-helix structure is found in:

Proteins are composed of

Which of the following acids behaves like a salt in aqueous solution?

The Biuret test is not given by:

The melting points and solubility in water of amino acids are generally higher than that of the corresponding halo acids. Explain.

Assume that a particular amino acid has an isoelectric point of $6.0$. In a solution at $pH$ $1.0$,which of the following species will predominate?