Bacterial Structure

Question 1

gram positive bacteria stain _____ and gram negative bacteria stain _______

Answer 1

purple, red

Question 2

nucleic acid ____ content varies 25-75% in bacteria, greater than 97% identity in _______ identifies as same species

Answer 2

GC

16S rRNA

Question 3

bacterial cell wall composed of?
protects against what type of pressure?
destroyed by ______ present in secretion

Answer 3

peptidoglycan

turgor pressure

lysozyme

Question 4

cell envelope of gram positive bacteria?

Answer 4

• multilayered peptidoglycan
• techoic acid
• lipotechoic acid
• induce inflammation and septic like shock

Question 5

cell envelope of gram negative bacteria?

Answer 5

• thin layer of peptidoglycan
• outer membrane contains lipopolysaccharide and porins
• porins allow passage of small hydrophilic molecules

Question 6

acid fast cells wall have _____ acid and arabinogalactan, require special acid fast staining technique

Answer 6

mycolic

Question 7

capsules composed of?

function?

Answer 7

polysaccharide or polypeptide

evasion of phagocytosis, resistance to dessication, attachment