niti
Forum Guru
Topics: 36
Posts: 499
|
Characteristics of a bacterial capsule include:
A. All bacteria have one
B. It is composed of peptidoglycan
C. It is an important mechanism for protecting a bacteria against ingestion by PMNs
D. It is what causes the gram stain reaction
|
| milu
Forum Junior
Topics: 18
Posts: 35
|
B???? or C???
cause all bacteria don't have capsule and u don't use gram stain to visualize
___________________
truth is great yet truthful living is the greatest....
Mili
|
| MLF
Forum Elite
Topics: 36
Posts: 386
|
I would say C, because, the basicallus anthracis is not a peptidoglycan, but polypeptide capsule.
___________________
"Support bacteria, its the only culture some people got."
|
| anatomy
Forum Guru
Topics: 101
Posts: 423
|
I THINK "C"
|
| nadia_usmle
Forum Newbie
Topics: 4
Posts: 17
|
agree C. It is an important mechanism for protecting a bacteria against ingestion by PMNs
|
| niti
Forum Guru
Topics: 36
Posts: 499
|
Yes.the ans is
C. It is an important mechanism for protecting a bacteria against ingestion by PMNs
|
| bactitech
Forum Elite
Topics: 25
Posts: 486
|
Sometimes on gram stains you can "see" the capsule around an organism because the immediate area around the rod doesn't stain. You have to focus up and down to visualize this. It shows up with smears of S. pneumoniae, Klebsiella pneumoniae, and Cryptococcus neoformans (the classic mechanism of an India Ink prep, where the India Ink butts up against the huge capsule surrounding the yeast cell). You can see it in a gram stain of C. neoformans also, but it doesn't visualize nearly as well as with the India Ink, and this yeast doesn't stain well with Gram stain.
___________________
Clinical Microbiology since 1974
|
| alexbuc
Forum Newbie
Topics: 3
Posts: 18
|
definitely c
capsule is not made but of polizacharides sometimes polipeptides as glutamic acid in anthrax
___________________
hello...i strated to prepare my usmle step1....need to know more about...looking for someone to work with
alex
|
| mjl1717
Forum Hero
Topics: 955
Posts: 5,451
|
*Ill attempt to eliminated the more difficult distractors:
The gram stain rxn in gram +s is due to a thick peptidoglycan cell wall which contains glycine and teichoic acid--purple (more tightly crosslinked
and retains the original dye)
The gram stain rxn in gram negatives is due to a lipopolysaccharide outer membrane.-red.(outer membrane damaged by the decolorizer,*doesnt retain the original dye)
That safranin counterstain is a pale red dye.
*Capsules-most polysaccharides, B. anthracis-polypeptide, S.pyogenes-
hyaluronic acid
*Also peptidoglycan is either in the cell wall for gram+s/or periplasmic space for gram negatives.
I rest my case.
___________________
Smell the coffee! "Is That an Osler move??"
|
| ferekide
Forum Junior
Topics: 7
Posts: 45
|
plz check one more time
s pyogenes has hialuronic ac. capsule?
never heard about it...thought it s polizaharides
___________________
hello...i am preparing for usmle 1
|
| bactitech
Forum Elite
Topics: 25
Posts: 486
|
http://gsbs.utmb.edu/microbook/ch013.htm
Scroll down to Pathogenesis. Found this on google using search phrase
Streptococcus pyogenes + capsule
<1 minute 
___________________
Clinical Microbiology since 1974
|
| ferekide
Forum Junior
Topics: 7
Posts: 45
|
yes...thx so much bachi
___________________
hello...i am preparing for usmle 1
|
|
| |
| | | | | | | | | | | | |
