Lecture 4

Question 1

What does the suffix ‘virales’ mean?

Answer 1

Viruses in an order

Question 2

What does the suffix ‘viridae’ mean?

Answer 2

Viruses in a Family

Question 3

What does the suffix ‘virinae’ mean?

Answer 3

Viruses in a subfamily.

Question 4

What does the suffix ‘virus’ mean?

Answer 4

Viruses in a genus.

Question 5

True or false - gram positive vell walls have more peptidoglycan in them than gram negative.

Answer 5

True

Question 6

True or false - gram positive cell walls have more pores in them than negative.

Answer 6

False

Question 7

Give an example of a selective growth medium.

Answer 7

Mannitol Salt agar

Question 8

Is sheep blood agar a differential medium?

Answer 8

Yes - can differentiate beta-haemolytic bacteria

Question 9

In the phenol red test, a colour change to yellow indicates what?

Answer 9

Fermentation (acid produced)

Question 10

True or false - enveloped viruses are generally more susceptible to antibody-mediated immunity than non-enveloped viruses.

Answer 10

False - antibody-mediated immunity neutralises non-enveloped viruses, whilst cell mediated immunity is usually needed for enveloped virus destruction.

Question 11

What is the difference between a yeast and a mould?

Answer 11

A yeast is a single cell of fungi ; a mould is multicellular filamentous fungi. Dimorphic fungi may be either of these depending on growth conditions.

Question 12

How do fungi reproduce?

Answer 12

Spores

Question 13

Name two stains often used for fungi.

Answer 13

Periodic Acid Schiff

Silver