Micro 8 (Test 2)

Question 1

In order to inhibit microbial growth, food should be kept either _____ or _____.

Answer 1

hot or cold

Question 2

The incubation conditions for bacteria to grow includes _____ and _____ at a temperature of _____.

Answer 2

glucose, water, 37 degrees celsius

Question 3

Different ways in which an anaerobic environment is created:
_____ reduces 02 to water
_____ and replaces it with another gas
_____ causes 02 to combust
_____ burning - the rapid chemical reaction between 02 and the burning object

Answer 3

thioglycolate reduces o2 to water
inter gases excahge with air and replaces it with another gas
sodium or phosphorus causes 02 to combust
candle burning- the rapid chemical reaction between o2 and the burning object

Question 4

_____ need sugar, either in the form of sucrose or glucose.

Answer 4

heterotrophs

Question 5

The population of bacteria will double every _____ minutes.

Answer 5

15

Question 6

During the _____ phase, the bacteria are adapting to the current conditions and formulating the correct enzymes needed.

Answer 6

lag/latency

Question 7

The _____ phase is when there is a rapid growth of bacteria, a depletion of nutrients, and an accumulation of wastes.

Answer 7

log/exponential

Question 8

The _____ rate exceeds the _____ rate during the Log phase.

Answer 8

reproduction ….. death

Question 9

Label the different phases on the bacterial growth curve.

A, B, C, D =

Answer 9

A= lag B= log C= stationary D= death

Question 10

All the class properties of bacterium are exhibited in the _____ phase.

Answer 10

log

Question 11

During the _____ phase the rate of cell death equals the rate of cell growth and the amount of nutrients equals the amount of wastes.

Answer 11

stationary

Question 12

During the _____ phase, the cell death exceeds the cell reproduction, amount of toxic wastes is overwhelming, no space is available, the bacteria no longer exhibits their class properties, and the amount of nutrients, gases, and water is depleted.

Answer 12

death

Question 13

Bacteria in the decline phase ever a state of _____ (they are dormant until the conditions become favorable again).

Answer 13

senescence

Question 14

Bacteria can come out of a state of senescence by _____ it to a new media or by unfreezing it

Answer 14

transfering (transpering?)

Question 15

TRUE or FALSE: All phases on bacterial growth curve are always present.

Answer 15

False

Question 16

A population of bacteria confined to location in which the nutrients, hydration, gases cannot be replenished is called a _____ _____.

Answer 16

closed system

Question 17

The amount of time that lasts between generations is called the _____.

Answer 17

Generation time