1.1. A section of polypeptide was hydrolysed and the amino acids in Table 3.1 were identified.

Table 3.1

Which of the amino acids T, U or V has the highest pH in an aqueous solution? Explain your answer.

Amino acid .............................

1.2. State how many different dipeptides could be formed from a reaction mixture consisting of amino acids T and U.

1.3. Polypeptides contain a high proportion of carbon and hydrogen in their structures, yet many are soluble in water. By referring to the structure of a polypeptide, explain why.