MICROB Bacteria Basics Flashcards
Answer:
a, c, d
Note that some bacteria may not have cell wall –> no peptidoglycan (chlamydia, mycoplasma)
Also LPS is only found in outer cell membrane exclusive to gram neg bacteria
Answer: C!
Micrometer range, single circular chromosome, and have both DNA and RNA!
AFB stains needed for what bacteria ?
AFB stains needed for what bacteria ?
Mycobacteria and Nocardia
Bacterial names, first name is 1. and second name is 2.
Bacterial names, first name is 1. and second name is 2.
1. Genus
2. Species
Genome of Bacteria?
Genome of Bacteria?
Genome is DNA
as single circular chromosome
Might also contain RNA
Gram positive have thicker _ compared to gram negatives
Gram positive have thicker _ compared to gram negatives
Thicker cell wall (peptidoglycan) even though they dont have outer cell membrane
Layman term for Helminths?
Layman term for Helminths?
Worm
Lipopolysaccharide (an endotoxin) is found in which class of bacteria?
Lipopolysaccharide (an endotoxin) is found in which class of bacteria?
Gram negative only.
Gram positive bacteria does not have an outer cell membrane so no LPS
Opportunist pathogen means?
Opportunist pathogen means?
Does not infect normal hosts. Could even be normal flora.
But affect immunocompromised hosts
Outline the structure of gram negative and gram postive bacteria (vvvvvvvvv IMPT!!!)
Gram positive: […]
Gram negative: […]
Outline the structure of gram negative and gram postive bacteria (vvvvvvvvv IMPT!!!)
Gram positive: Thick peptidoclycan cell wall, no outer cell membrane
Gram negative: Thin peptidoglycan cell wall, got outer cell membrane, got LPS (endotoxin)
What are Prions?
What are Prions?
Non-living, no DNA/RNA, no cells. Are just proteins…
But can cause diseases such as MCD
What does gram stain need to work?
What does gram stain need to work?
Peptidoglycan
What is the major substance found in bacterial cell wall?
What is the major substance found in bacterial cell wall?
Peptidoglycan. Both gram positives and gram negatives has it!
Why are gram positives stained purple? Why are gram negatives stained pink?
[…]
[…]
Why are gram positives stained purple? Why are gram negatives stained pink?
**Thick peptidoglycan wall in gram positives traps crystal violet-iodine complex. **
Thin peptidoglycan wall in gram negatives unable to trap crystal violet-iodine complex, hence can be washed out and counterstained with red safranin
For understanding:
