Bacteria Lab Flashcards
1
Q
what essential vitamins do bacteria in our gut synthesise?
A
Vitamin K and some B Vitamins
2
Q
what secretes defensins?
A
epidermis
3
Q
what are defensins?
A
antimicrobial peptides (protein) which disrupt bacterial cell walls.
4
Q
what type of secretion is sebum and what makes it bactericidal?
A
oil based
sebum contains bacteriocytes
5
Q
what is the structure of peptidoglycan and what acids are bound to this core structure?
A
- N-acetyl glucolamine
- N-acetyl muramic acid
6
Q
What is the procedure of gram stain?
A
- fixing cells to a glass slide and killing them with brief heat exposure
- expose them to crystal violet followed by iodine.
- excess removed with an alcohol wash
- counter stain ,stains all cells.
- gram positive retain the crystal violet stain
- gram negative cells appear pink
