The bond that determines the secondary structure of a protein is

Accumulation of which of the following molecules in the muscles occurs as a result of vigorous exercise?

$1.78 \ g$ of an optically active $L$-amino acid $(A)$ is treated with $NaNO_{2} / HCl$ at $0^{\circ}C$. $448 \ cm^{3}$ of nitrogen at $STP$ is evolved. $A$ sample of protein has $0.25 \%$ of this amino acid by mass. The molar mass of the protein is

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

Which among the following amino acids has the lowest molar mass?

Identify the side chain $(R)$ group present in Leucine,an amino acid.