WorksheetsMicrobial growth
Total questions: 25
Worksheet time: 13mins
Bacteria make necessary enzymes for growth/reproduction.
Lag
Log
Stationary
Death
Long-term Stationary (LTS)
Most binary fission occurs.
Lag
Log
Stationary
Death
Long-term Stationary (LTS)
#New cells = #Dying cells
Lag
Log
Stationary
Death
Long-term Stationary (LTS)
No nutrients or space remain for growth.
Lag
Log
Stationary
Death
Long-term Stationary (LTS)
Spores are formed or new protective genes are activated.
Lag
Log
Stationary
Death
Long-term Stationary (LTS)
Culture media provide microbes with:
CO2
O2
nutrients
agar
Bacteria growing in natural environments form:
colonies
pure cultures
spores
biofilms
Bacteria growing in lab environments form:
colonies
gangs
spores
biofilms
Biofilms are associated with more than 50% of infections.
True
False
The two most common types of media used in the laboratory are:
chemically defined & simple
agar & broth
simple & complex
differential & selective
A single colony:
is grown to provide a pure culture
starts as a single bacterial cell
consists of identical "clones"
all of these
Is H2O2 (hydrogen peroxide) toxic?
No
Yes, it is always toxic
Not if you produce catalase and peroxidase
Not if you produce superoxide dismutase
A medium in which the exact chemical composition varies slightly between batches:
nonselective
differential
complex
simple
Fastidious organisms:
are motile
are anaerobic
require many growth factors
grow slowly
Why is it that organisms that use and/or tolerate oxygen must have superoxide dismutase?
Oxygen free radicals are toxic
To produce the final electron acceptor superoxide from water
To form metabolic water from oxygen and hydrogen ions
Dismutation requires oxygen
Which of the following conditions do you think would present the greatest problem for bacterial survival?
hypotonic solution
low temperature
neutral pH
hypertonic solution
The normal method of reproduction of bacteria is:
fragmentation
binary fission
transduction
budding
Mesophile:
microbes that grow at >80 degrees Celsius
microbes that grow between 20-30 degrees Celsius
microbes that grow between 50-60 degrees Celsius
microbes that grow between -20 & 19 degrees Celsius
microbes that grow between 25-40 degrees Celsius
Thermophile:
microbes that grow at >80 degrees Celsius
microbes that grow between 20-30 degrees Celsius
microbes that grow between 50-60 degrees Celsius
microbes that grow between -20 & 19 degrees Celsius
microbes that grow between 25-40 degrees Celsius
Hyperthermophile:
microbes that grow at >80 degrees Celsius
microbes that grow between 20-30 degrees Celsius
microbes that grow between 50-60 degrees Celsius
microbes that grow between -20 & 19 degrees Celsius
microbes that grow between 25-40 degrees Celsius
Psychrophile:
microbes that grow at >80 degrees Celsius
microbes that grow between 20-30 degrees Celsius
microbes that grow between 50-60 degrees Celsius
microbes that grow between -20 & 19 degrees Celsius
microbes that grow between 25-40 degrees Celsius
Psychrotroph:
microbes that grow at >80 degrees Celsius
microbes that grow between 20-30 degrees Celsius
microbes that grow between 50-60 degrees Celsius
microbes that grow between -20 & 19 degrees Celsius
microbes that grow between 25-40 degrees Celsius
Acidophile:
microbes that grow best at pH>7
microbes that grow best at pH<7
microbes that grow best at pH=7
Osmophile:
sugar-loving microbe
salt-loving microbe
methane-loving microbe
Halophile:
sugar-loving microbe
salt-loving microbe
methane-loving microbe
