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Microbial Growth Chapter 6
Test Description: Microbial Growth
Instructions: Answer all questions to get your test result.
1) Microbial Growth represents an increase in???
A
Numbers, not an increse in size
B
None of these
C
An increase in numbers of everything
D
An increase in size
2) What is generation time?
A
The time required for a population to double in number/ time required for one cell to divide
B
None of these
C
The time required for a generation to develope
D
A long amount of time
3) The bacterial growth curve consists of how many phases and what are they?
A
4 phases-log phase, lag phase, stationary phase, death phase
B
4 phases- lag phase, log phase, stationary phase, and death phase
C
none of these
D
4 phases-stationary phase, lag phase, log phase, death phase
4) What is the period of little to no cell division?
A
log phase
B
lag phase- cells adjusting to a new enviroment, a period of high meatbolic activity
C
death phase- cells dying at an exponential rate
D
stationary phase
5) What is the log phase?
A
All of these
B
cells are dividing at a constant and maximum rate
C
cells continue to be extremely metabolically active
D
period of exponential growth
6) What occurs in the death phase?
A
none of these
B
All cells die
C
Cells are dying at an exponential rate
D
Some cells live
7) What four factors contribute to the occuring death of cells in the stationary phase?
A
nutrients, ph, temperature, and an increase in wast products
B
ph, temperature, minerals, and waste products
C
none of these
D
nutrients, water, temperature, and waste products
8) What is the stationary phase?
A
none of these
B
the number of cell dying is equal to the number of cells increasing in size
C
the number of cells dying is equal to the number of cells being processed
D
the number of cells dividing is equal to the number of cells dying
9) Plate counts, filtration, (MPN)-most probable number, and microscope count are all examples of what?
A
dry weight
B
direct methods
C
none of these
D
indirect methods
10) what is the purpose of direct methods?
A
a superior term for measurment of bacteria
B
give an indication of the relative amount of growth
C
a guess
D
give an actual number
11) What term describes the definition of giving an indication of a relative amount of growth?
A
direct methods
B
measurements of bacteria
C
none of these
D
indirect methods
12) Turbidity, metabolic activity indicators, and dry weight are all examples of what?
A
direct methods
B
growth factors
C
indirect methods
D
theese are all correct
13) what are psychrophiles?
A
prefer cold temps -5C to 20C/ all grow between 0C to 5C
B
prefer moderate temps 20C to 45C
C
growth above 50C only
D
prefer warmer temps
14) What are psychrotrophs?
A
prefer moderate temps 20C to 45C
B
prefer cold temps -5C to 20C
C
a group that can grow at temps as low as 0C, but grow optimatley at 20-30C: spoil foods
D
prefer warmer temps
15) What prefers warmer temps at 20C to 45C and all can grow at body temp of 37C?
A
psychrotrophs
B
thermophiles
C
mesophilies
D
psychrophiles
16) What will grow at 37C but optimal growth occurs at 45C to 60C?
A
facultaive thermophiles
B
psychrophiles
C
hyperthermophiles
D
psychrotrophs
17) What are hyperthermophiles/extreme thermophiles?
A
none of these
B
growth above 50C only
C
growth between 20C to 45C
D
growth between -5C to 20C
18) What are the Physical Requirments for Microbial Growth?
A
Ossmotic Pressure, PH, and Water
B
Temperature, Osmotic Pressure, and PH
C
Temperature, Nutrients, and Ph
D
PH, Nutrients, and Osmotic Pressure
19) What are the Chemical Requirments for Microbial Growth?
A
H2o and Carbon
B
Carbon and Oxygen
C
none of these
D
Just Oxygen
20) What is a hlophile?
A
none of these
B
oil loving
C
salt loving
D
water loving
*select an answer for all questions
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