lecture fresh up microbiology

Question 1

what are the main characteristics of a bacteria?

Answer 1

pili, fimbriae, caspule, dna in a circular form, flagellum for movement and presence of plasmids

Question 2

What does the bacterial wall consist of?

Answer 2

N-acetylglucosamine(NAG) and N-acetylmuramic acid (NAM). Chain of amino acids and transpeptidase

Question 3

How does the bacterial division work?

Answer 3

1. cell elongates and DNA is replicated
2. cell wall and plasma membrane begin to divide
3. cross-wall forms completely around divided DNA
4. cells separate

Question 4

What are the growth phases of bacteria?

Answer 4

1. lag phase
2. exponential phase
3. stationary phase
4. death phase

Question 5

What colour does the cell wall give when stained?

Answer 5

gram-positive is purple and gram negative is pink/red

Question 6

What is quorum sensing?

Answer 6

communication between bacteria