(a)[1]
Give the molecular formula for asparagine.
(b)[2]
Name every functional group present in an asparagine molecule.
(c)[2]
Draw the structure of the dipeptide made from valine and asparagine. The peptide bond should be displayed and clearly labelled.
(d(i))[2]
Explain what is meant by a buffer solution.
(d(ii))[2]
Write two equations to show how valine can work as a buffer. Use the formula $\text{H}_2\text{NCHRCO}_2\text{H}$ for valine in your equations.
(e)[2]
Each valine molecule contains one chiral carbon atom. Draw three-dimensional diagrams to show the two optical isomers of valine. The $(\text{CH}_3)_2\text{CH}$ group may be shown as R.
(f)[2]
Asparagine is hydrolysed on heating with aqueous sulfuric acid. Write an equation for this reaction.