Bacteria Growth Curve

Question 1

what are the different phases of bacterial growth

Answer 1

lag phase
log phase
stationary phase
death phase

Question 2

what occurs in lag phase

Answer 2

number of cells are constant
cells are preparing for growth
metabolic activity without division

Question 3

what occurs in log phase

Answer 3

exponential growth

the doubling varies among strains and conditions

Question 4

what occurs in stationary phase

Answer 4

new growth matches rate at which they die off as the organisms run out of nutrients

Question 5

what occurs in death phase

Answer 5

all nutrients are used up

bacteria start to die due to build up of waste products

Question 6

bacterial growth can be controlled by what

Answer 6

heat
irradiation
antimicrobial agents
antibiotics

Question 7

what is the disease triangle

Answer 7

interaction between the host, the agent, and the environment that will affect whether or not the host is infected

Question 8

what are other names for the disease triangle

Answer 8

communicable disease triangle

epidemiological triangle

Question 9

what is the host in the disease triangle?
what is the agent?
what is the environment?

Answer 9

host - human
agent - microbe
environment - external factors

Question 10

what does the environment control?

Answer 10

whether or not the spread of disease occurs

Question 11

what are adaptions made by viruses, bacteria, fungi, and parasites to promote survival

Answer 11

viruses - undergo antigenic shift to survive
bacteria - form spores to survive
fungi - form spores to survive
parasites - form cysts to survive