Chapter 3 notes Flashcards
(47 cards)
Define infection
a microbe that invades a human or other organism and causes illness and disease
What two things do growth of microbes include
–catabolic and anabolic process to increase cell size
–make more copies of itself
How do eukaryotes reproduce
sexually AKA meiosis
How do prokaryotes reproduce
binary fission
What does the parent cell of binary fission have
ribosomes and chromosomes
What are the steps of binary fission
- parent cell
- duplicating chromosomal DNA
- chromosomes separate and attach to cytoskeleton
- septum divides the cell in half
- two daughter cells
Out of the 2 daughter cells, which cell is the parent cell and which cell is the daughter cell
they’re both new parent
Equation for generation time
G = t/n
Define generation time
time per complete fission cycle of the population or doubling of population
growth can cause what with max rate of population
maxes out rate of binary fission
What is the equation for predicting population size over time
Nf = (Ni)2^n
What is the blood culture test
mix it with a medium, put sample in media to check for growth
Define incubated
grown under optimal conditions
Why do we streak plates
to isolate individual cells/colonies
CFU is the number of
visible colonies formed
What are the characteristics of H. infleunzae
gram negative
non motile coccobacillary
facultatively anaerobic
Is there blood agar growth in H. influenza
NO–BAP lack specific nutrients required for growth of H. influenza
What are the characteristics of S. Aureus
gram positive cocci
non motile
facultative anaerobe
is there growth in blood agar of S. aureus
yes beta
Characteristics of M tuberculosis
gram positive rod shaped
strict aerobic, acid fast
is there growth in blood agar of M. tuberculosis
yes, gamma
Characteristics of S. pneumoniae
gram positive
coccus
aerotolerant anaerobe
Is there blood agar growth in S. pneumoniae
yes alpha
Define blood agar
rich medium containing 5% sheep blood that can differentiate bacteria based on their hemolytic properties
