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