Name the amino acid having a methyl group as its R-group.

Name the amino acid involved in urea cycle.

Name the simplest amino acid in which the R-group is a hydrogen.

The amino acid attaches to the tRNA at its:

Give one example each of alpha -amino acid which is achiral and alpha -amino acid having more than one chiral centre.

Give the name of functional group present in propanol.

Which does not have a carboxyl group ?

Enzymes are proteins. These are long chains of amino acids linked to each other by peptide bonds. Amino acids have many functional groups in their structure. These functional groups are many of them at least, ionisable. As they are weak acids and bases in chemical nature, this ionization is influenced by pH of the solution. For many enzymes, activity is influenced by surrounding pH. This is depicted in the curve below: explain briefly.