then and now Flashcards
how did pasteur develop germ theory of disease?
- wanted to understand fermentation
mix yeats w/ sugar-H20
=> wines have organism
when gently heat, pasteur bacteria
how will a fetus first get contacted with microbes?
free of most microbes until initially birth cannals
gets infected with microbes from caregiver, family and death
traits of living organism?
prokaryotes vs eukaryotes
1st has no membrane bound organelles with cell wall. vice versa.
1st is responsible for disease / food spoilage / production l. eukaryotes are mostly harmless.
1st get food from environment or make their own. eukaryotes absorb nutrient ir microorg
what does fungi secrete?
secrete digestive enzyme that breaks down nutr; absorb it across cell wall
what is special abt virus?
not an org
need to infect an org to replicate
problems of microbiology now and causes?
(1) drug resistant pathogen: pathogen mutate or acquire genes from bacteria
(2) re emeging disease
what comprise a bacteria cell? (the diagram, %)
70% water , organic compound and ions
list from biggest to smallest in concentration: phospholipid, protein, carb, nucleic acid
protein > nucleic acid > phospholipid > carb
match each polysacc to its corresponding cell wall: chitin, cellulose, and peptidoglycan
chitin- fungi
peptidoglycan- bacterial
cellulose- algae
what makes up a nucleotide?
PO4 group, 5C sugar, nucleobase
what makes up double helix DNA?
2 polynucleotide strands , sugar PO4 backbone and complementary base pair
match to make complementary base pair in nucleobase
G-C
A-T
TEM ve SEM?
(1) specimen finely sectioned, stained with heavy metal and placed kn CU grid
(2) specimen xovered in gold
simple staining vs negative staining?
(1) cationic dye binds to (-) cell
(2) anionic dye repels (-) cell
