Infection

Question 1

What is a nucleoid?

Answer 1

The DNA and associated proteins within a bacteria

Question 2

What are the properties of the nucleoid?

Answer 2

It has no nuclear membrane
It has one single circular chromosome
The chromosome is organised by DNA gyrase
Contains primitive DNA segregation machinery

Question 3

What is the cell wall of a bacteria formed from?

Answer 3

Peptidoglycan

Question 4

What are the components of peptidoglycan?

Answer 4

NAG - N-acetylglucosamine
NAM - N-acetylmuramic acid
Peptide side bridges

Question 5

What are the layers of a gram positive cell wall?

Answer 5

Capsule
Protein layer
Peptidoglycan + secondary wall polymer
Cytoplasmic membrane

Question 6

What are the layers of a gram negative cell wall?

Answer 6

Capsule
Lipopolysaccarides
Outer membrane
Periplasm
Peptidoglycan
Inner membrane

Question 7

What 2 structures are examples of Lipopolysaccarides?

Answer 7

Antigens and endotoxins

Question 8

What is a prokaryote that prefers low temperatures called?

Answer 8

Psycrophiles

Question 9

What is a prokaryote that prefers high temperatures called?

Answer 9

Thermophiles

Question 10

What is a prokaryote that prefers body temperature called?

Answer 10

Mesophiles