Lecture 5: Viruses 2 and Microbial Growth Flashcards
1
Q
Population growth is often studied by analyzing the _______ of a microbial culture
A
Growth Curve
2
Q
Growth curves are observed when microbes are cultivated in a ______ , which is a closed vessel, single batch of medium
A
batch culture
3
Q
What are the labels on this diagram?
A
4
Q
What happens in the lag phase?
A
No growth. Cells are synthesizing new components
5
Q
What happens in the Exponential or Log phase?
A
- Balanced, constant growth
- Can express growth as generation/doubling time
- The time required for cells to divide
- Varies from minutes to days depending on the organism
6
Q
What happens in the stationary phase? Why does this happen?
A
Population growth ceases
Happens due to limited resources/nutrients, toxin build up, and oxygen deprivation
7
Q
What happens here?
A
Sporulation and antibiotic production
8
Q
Under nutrient limiting conditions, some microbes form stress-resistant, dormant cells called:
A
Spores
9
Q
What are 2 Genus’ that produce spores?
*****
A
- Bacillus
- Clostridium
