Bacteriology

Question 1

Gram positive bacteria cell wall

Answer 1

Peptidoglycan complexed with techoic acids

Question 2

Gram negative cell wall

Answer 2

Peptidoglycan complexed with phospholipid protein lipo-polysaccharide.

Question 3

Peptidoglycan is made up of 2 amino sugars

Answer 3

1. N- acetyl glucosamine
2. N- acetyl muramic acid

Question 4

Amino sugars are complexed with amino acids like

Answer 4

1. L or D alanine
2. D glutamic acid
3. L lysine
4. Diaminopimic acid
5. Diaminobutyric acid

Question 5

In some cases, amino acids like

Answer 5

Glycine or Aspartic acid maybe present

Question 6

In the peptidoglycan, there’s extensive criss linking btwn amino acids
For example, in Staph. aureus

Answer 6

Glycine pentapeptide + lysine +terminal D alanine

Question 7

Protoplasm

Answer 7

Kept intact in hypertonic solutions

Question 8

Osmotic pressure

Answer 8

Less in gram negative than in gram positive.

Question 9

Teichoic acid

Answer 9

Polymeric complexes of ribitol phosphate and glycerol phosphate with alanine with simple sugar or amino sugar

Question 10

Cell membrane

Answer 10

Impermeable to small molecular wght subs. Like
Amino sugars and simple sugars