Proteins have primary structure. If you are given a method to know which amino acid is at either of the two termini (ends) of a protein, can you connect this information to purity or homogeneity of a protein?

3

(a)

Without metabolism, the living state can not exist Justify.

3

(a)

Enzymes are proteins. Proteins 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 ionizable as they are weak acids and bases in chemical nature. This ionisation is influenced by the pH of the solution. For many enzymes, activity is influenced by surrounding pH. This is depicted in the curve given explain briefly.

3

(a)

The lines A to D below show how change in temperature can affect the rate of enzyme reaction.Line N shows the rate of reaction under optimum temperature.

Which line A, B, C or D shows the rate of enzyme reaction at \(60°C\)?

3

(a)

(i) Name the category to fats belong?
(ii) What is cholesterol?
(iii) What are the two forms of cholesterol?

3

(a)