Which of the following is manufactured from molecular nitrogen by bacteria?

Which of the following describes the linkage of $\alpha-$amino acids in a protein molecule?

How many tripeptides can be prepared by linking the amino acids glycine,alanine and phenylalanine?

Which of the following metals forms a complex with insulin?

Among the following,the achiral amino acid is

What is the $pH$ of $0.01 \ M$ glycine solution? For glycine,$K_{a1} = 4.5 \times 10^{-3}$ and $K_{a2} = 1.7 \times 10^{-10}$ at $298 \ K$.