Which of the following compounds will form a zwitterion?

What do you mean by the sodium-potassium pump?

Identify the basic amino acid.

The number of cyclic tripeptides formed with $2$ amino acids $A$ and $B$ is:

$A$ 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 of the following amino acids possesses two chiral centres?