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6. Which is not a selective targets for drugs to treat fungal infections?
- chitin
- polysaccharides
- glucans
- ergosterol
7. Which of these is incorrect regarding plaque formation
- the 'plaque' is a structure found in bacteriophages which is the replicated virus
- once the virus has been replicated, the host cell releases them (lysis) and is n longer needed
- viruses contain DNA and so a host cell is not needed
- the host cell used is a bacteriophage (it's used for its metabolic ability)
8. What does not happen during the stage 4 of bacterial growth (death phase)?
- the phase length is variable
- It is induced by a lack of nutrients
- autolysis occurs
- there is a net loss of cells
9. Which about bacterial exopolysaccharides is incorrect?
- their function is to protect and avoid dessication
- they are slime and capsules
- They are 50% water and 50% carbs
- examples are dextrans and alginate
10. Which of the following about bacterial cell walls is incorrect?
- They are chemically reactive
- They are composed of peptide chains and carbohydrates
- It is made of peptidoglycans
- They provide mechanical strength
11. Which of these would you not see in a gram -ve when gram staining?
- an outer membrane
- teichoic acids
- thinner layer of peptidoglycan
- periplasm
12. Which of he following is not a correct difference between pili and fimbriae
- pili are longer than fimbriae
- pili is for adhesin and genetic exchange whereas fimbriae is for attachment and clumping
- The number of fimbriae is variable but there is only 1-2 pili per cell
- pili are more than 3um long and more than 6nm in diameter whereas fimbriae are 3um by 6nm
13. Which of the following is NOT a property of the influenza A virus?
- it undergoes extensive antigenic variation
- it is the major cause of sexual infections
- it infects animals and humans
- it is an enveloped virus with an RNA genome
14. Which of these about bacterial chromosomes is correct?
- it consists of single stranded DNA
- They are linear
- They are 1-2mm
- There are 2-3 in each cell
15. Which statement about plasmids is correct?
- They are extrachromasomal
- There is 1 per cell
- they prevent mutations
16. Which of the following about bacterial cell membranes is correct?
- They are thick (80nm)
- They do not allow for endo or exocytosis
- They contain fatty acids, including cholesterol
- They are metabolically inert
17. Which of these about viruses is correct?
- they are 28-200nm in size
- they cannot produce protein but they can produce ATP
- they only contain DNA
- their outer protein coat is called a capsomere
18. give the incorrect statement about flagella
- they are are 2-8nm in diameter
- they are helical
- their function is motility
- the number and distribution is variable
19. Which of these is not a gram positive ROD bacteria?
- Staphylococcus
- Bacillus
- Clostridium
- Listeria