microbiology ch 12 ( lactobacilli, cornybacteria, and propionibacteria)

Question 1

Lactobacilli

Answer 1

love low ph ( aciduric), oral cavity and human vagina, alpha or non haemolytic, ferment carbohydrates to make acid, grow at ph 6,

Question 2

2 main groups of lactobacilli

Answer 2

homofermentors- produce lactiv acid

heterofermentors- produce lactic acid, acetate, ethanol and CO2

Question 3

Corynebacteria diptheria

Answer 3

human throat, nose, sometimes skin, cell wall contains mycolic acid, Divide via snapping fission,

Question 4

corynebacteria diptheria’s tox gene

Answer 4

subunit A- adenosine diphosphate ribosylating function

subunit B- binds toxin to cell surface receptors

Question 5

c. diptherias toxins

Answer 5

exotoxin which results in grey psuedomembrane that may obstruct airway. It affects motor nerves of myocardium and nervous system

Question 6

what converts the toxin to a toxoid?

Answer 6

formaldehyde , a toxoid is non toxic but still antigentic

Question 7

what test is ran to see if the diptheria has the exotoxin?

Answer 7

elek plate test

Question 8

propionibacteria

Answer 8

is a diptheroid ( like diptheria)