SSCE VCE Chemistry Families of Organic Compounds: a. i. Draw the full structural f

Question

a. i. Draw the full structural formula of the 2-amino acid (α-amino acid) which has the molecular formula C₂H₅NO₂. Clearly show all bonds.

The amino acid drawn in part i can form two different dipeptides as a result of condensation reactions with the 2-amino acid C₂H₅NO₂. Draw a structural formula of one of the dipeptides formed in the reaction between one molecule of each of these two amino acids.

b. The primary structure of a section of a food protein chain is shown below. The formulas of the side chain groups Z₁, Z₂, Z₃ and Z₄ are also given.

On the above section of the protein chain, circle one complete peptide link.

Which one of the side chain groups, Z₂ to Z₄, would be positively charged at pH 2?

Which one of the side chain groups, Z₁ to Z₄, is often involved in the formation of covalent cross links which stabilise the tertiary structure of a protein?

Carboxypeptidase is an enzyme that catalyses the digestion of food protein in the small intestine where the pH is approximately 8. However, it does not catalyse the digestion of food protein in the stomach where the pH is very low. Suggest a reason for this difference.

Following digestion of this protein, nitrogen containing wastes will be produced. This waste nitrogen is excreted largely as urea. In the space below draw the full structural formula of the urea molecule. Clearly show all bonds.

a. i - VCE - SSCE Chemistry - Question 5 - 2007 - Paper 1

Worked Solution & Example Answer:a. i - VCE - SSCE Chemistry - Question 5 - 2007 - Paper 1

Suggest a reason for the difference in activity of carboxypeptidase

Draw the full structural formula of the urea molecule

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