bacteria lab

Question 1

Gram positive

Answer 1

• thick peptidoglycan layer
• looks purple after gram stain since it saturates the peptidoglycan layer
• staphylococcus aureus

Question 2

gram negative

Answer 2

• have a lipopolysaccharide layer
• looks red after gram stain since it saturates the peptidoglycan layer which is under the more prominent lipopolysaccharide layer
• salmonella enteritidis

Question 3

vancomycin

Answer 3

attacks gram positive bacteria
- attacks the cell wall

Question 4

nalidixic

Answer 4

effective against gram negative bacteria
- inhibits DNA synthesis

Question 5

tetracycline

Answer 5

effective against gram positive and negative bacteria
- inhibits protein synthesis

Question 6

Salmonella enteritidis

Answer 6

gram negative

Question 7

Staphylococcus aureus

Answer 7

gram positive

Question 8

Three basic forms of bacteria

Answer 8

• coccus (spherical)
• bacillus (rod-like)
• spirillum (spiral)