Succinic dehydrogenase is an enzyme that causes the substrate, succinate, to break down into fumarate
Malonate is a substance that resembles succinate and inhibits the activity of succinic dehydrogenase
Explain how this type of inhibition affects the activity of the enzyme

3

(a)

Find out how much cellulose is made by all the plants in the biosphere and compare it with how much of paper is manufactured by man and hence what is the consumption of plant material by man annually. What a loss of vegetation!

3

(a)

Explain the composition of triglyceride.

3

(a)

Is rubber a primary metabolite or a secondary metabolite? Write four sentence about rubber?

3

(a)

Differentiate between anabolism and catabolism, along with an example for each.

3

(a)

Living state and metabolisms are synonyms. Justify.

3

(a)

Comment on the statement 'living state is a non-equilibrium steady state to be able to perform work'.

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)

Describe the important properties of enzymes.

3

(a)

What is the tertiary structure of protein?

3

(a)

Give a brief description of nucleic acid.

3

(a)

What is the structural formula of sugars?

3

(a)

Explain the basic structure of a nucleotide.

3

(a)

Define living state.

3

(a)

Explain classification of enzymes.

3

(a)