SCHOOL OF SCIENCE
ANSWER FIVE (5) QUESTIONS.
- Discuss the distinction between prokaryotes and eukaryotes in the
- Write briefly on four of the following:
- (a) Saccharomyces cerevisiae,
- (b) the secondary immune response,
- (c) flagella,
- (d) endotoxins,
- (e) virus receptors.
- Give an account of genetic transfer by means of transduction
(generalised and specialised).
- The animal body has three lines of defence that must be overcome by
a pathogen before it can establish an infection leading to a disease.
The first is due to mechanical and chemical factors, the second phagocytosis
and the third antibody production. Briefly explain the mechanisms of these
defenses and elaborate on how the pathogenic organism might overcome them.
- Bacterial cell walls are so strong that drastic methods must be used to
break them down, eg. sonic oscillation or grinding with abrasive.
- (a) What factors account for the rigidity and strength of
bacterial cell walls?
- (b) How does penicillin act to cause the lysis and death of
- In your answer you should discuss both gram positive and gram
negative cell walls.
- Answer each of the following questions very briefly:
- (a) What is meant by the term "provirus"?
- (b) What is a plasmid?
- (c) Give the different forms of DNA and RNA found in viruses.
- (d) What are the differences between higher and lower fungi?
- (e) What are mycorrhizas?
- How does the bacterial cell regulate its growth and adapt to its
environment in terms of available foodstuffs?
Author: Dr Bharat Patel
HTML'd by Troy Baalham
[Created: 01 Apr 1996]
[Modified: 20 May 1996]