Microbial Growth Chapter 6 Question Preview (ID: 43861)


Microbial Growth. TEACHERS: click here for quick copy question ID numbers.

Microbial Growth represents an increase in???
a) Numbers, not an increse in size
b) An increase in size
c) An increase in numbers of everything
d) None of these

What is generation time?
a) None of these
b) A long amount of time
c) The time required for a generation to develope
d) The time required for a population to double in number/ time required for one cell to divide

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-stationary phase, lag phase, log phase, death phase
c) 4 phases- lag phase, log phase, stationary phase, and death phase
d) none of these

What is the period of little to no cell division?
a) lag phase- cells adjusting to a new enviroment, a period of high meatbolic activity
b) log phase
c) stationary phase
d) death phase- cells dying at an exponential rate

What is the log phase?
a) period of exponential growth
b) cells are dividing at a constant and maximum rate
c) cells continue to be extremely metabolically active
d) All of these

What occurs in the death phase?
a) All cells die
b) Cells are dying at an exponential rate
c) Some cells live
d) none of these

What four factors contribute to the occuring death of cells in the stationary phase?
a) nutrients, water, temperature, and waste products
b) nutrients, ph, temperature, and an increase in wast products
c) ph, temperature, minerals, and waste products
d) none of these

What is the stationary phase?
a) the number of cells dividing is equal to the number of cells dying
b) the number of cells dying is equal to the number of cells being processed
c) the number of cell dying is equal to the number of cells increasing in size
d) none of these

Plate counts, filtration, (MPN)-most probable number, and microscope count are all examples of what?
a) dry weight
b) indirect methods
c) direct methods
d) none of these

what is the purpose of direct methods?
a) give an actual number
b) give an indication of the relative amount of growth
c) a superior term for measurment of bacteria
d) a guess

What term describes the definition of giving an indication of a relative amount of growth?
a) measurements of bacteria
b) direct methods
c) indirect methods
d) none of these

Turbidity, metabolic activity indicators, and dry weight are all examples of what?
a) indirect methods
b) direct methods
c) growth factors
d) theese are all correct

what are psychrophiles?
a) prefer warmer temps
b) growth above 50C only
c) prefer moderate temps 20C to 45C
d) prefer cold temps -5C to 20C/ all grow between 0C to 5C

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 cold temps -5C to 20C
c) prefer warmer temps
d) prefer moderate temps 20C to 45C

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

What will grow at 37C but optimal growth occurs at 45C to 60C?
a) hyperthermophiles
b) facultaive thermophiles
c) psychrophiles
d) psychrotrophs

What are hyperthermophiles/extreme thermophiles?
a) growth above 50C only
b) growth between -5C to 20C
c) growth between 20C to 45C
d) none of these

What are the Physical Requirments for Microbial Growth?
a) Ossmotic Pressure, PH, and Water
b) PH, Nutrients, and Osmotic Pressure
c) Temperature, Osmotic Pressure, and PH
d) Temperature, Nutrients, and Ph

What are the Chemical Requirments for Microbial Growth?
a) Carbon and Oxygen
b) H2o and Carbon
c) Just Oxygen
d) none of these

What is a hlophile?
a) salt loving
b) water loving
c) oil loving
d) none of these

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