The functional groups present in Asparagine,a nonessential amino acid,are

Which $\alpha$-amino acid can cross-link peptide chains?

Which of the following is the correct structure of $L$-alanine?

$A$ protein undergoes reversible thermal denaturation from its initial state $N$ to denatured state $D$ according to $N \rightleftharpoons D$. At $60 ^\circ C$, the concentrations of both $N$ and $D$ are equal at equilibrium, and the standard enthalpy change of denaturation is $666 \text{ kJ mol}^{-1}$. The standard entropy change ($\Delta S^\circ$ in $\text{kJ K}^{-1} \text{mol}^{-1}$) of the protein upon denaturation at $60 ^\circ C$ is closest to

Which one of the following statements is true for protein synthesis (translation)?

Thyroxine produced in the thyroid is an iodinated derivative of . . . . . . amino acid.