WorksheetsMicrobial Growth AND Control Hmwk
Total questions: 20
Worksheet time: 15mins
Elijah and Zoe are studying the growth of bacteria in their biology class. They observe a phase in the growth curve where the population is most actively growing. Which phase is this?
stationary phase
exponential growth phase
lag phase
death phase
reproducing at the same rate as they are dying.
In a classroom experiment, Ava and Priya observed a phase in a bacterial growth curve where the organisms were dying more quickly than they were being replaced by new organisms. Which phase is this?
stationary phase
log phase
lag phase
death phase
Grace and William are observing bacteria growth in a petri dish. They notice that the bacteria growth is
linear
quadratic
exponential/logarithmic
radical
If 4 bacterial cells go through 2 divisions, how many cells are present?
4 cells
8 cells
16 cells
32 cells
During a science experiment, Jackson observed that extremely high temperatures can cause a decline in bacterial growth because
heat increases metabolic rate and creates more waste products.
heat slows down metabolic rate.
heat denatures enzymes/proteins.
heat creates a hypertonic environment.
If a mesophile is put in the freezer, it (select two that apply)
grows slowly
is not growing
remains viable
is killed
During a biology experiment, Jackson and William observed that anaerobes can't grow in the presence of oxygen because
they lack protective enzymes that break down toxic forms of oxygen
they lack carbohydrates like superoxide dismutase.
they don't have ribosomes.
they don't have mitochondria.
This type of organism grows ONLY when oxygen is available
obligate anaerobe
aerotolerant anaerobe
obligate aerobe
facultative anaerobe
microaerophile
Emma is conducting an experiment to identify bacteria that cannot grow when oxygen is present. Which type of bacteria is she studying?
microaerophile
aerotolerant anaerobe
obligate aerobe
obligate anaerobe
facultative anaerobe
Daniel is working in a laboratory and needs to use a chemical or physical procedure to destroy all pathogens, including endospores. What procedure should he use?
Degerming
Disinfection
Sterilization
Sanitization
Anika and Zoe are working in a kitchen and need to lower microbial counts on the surfaces to safe levels. This process is called
sterilization
sanitization
contamination
bacteriostasis
Elijah needs to use an antiseptic to kill pathogens. Where should he apply it?
in water
on a benchtop
on surgical equipment
on skin
Which are important in degerming?
phenols
Soaps/surfactants
halogens
aldehydes
Which 3 chemicals kill endospores AND mycobacteria?
sodium hypochlorite
ethyl alcohol
carbolic acid (phenol)
glutaraldehyde
ethylene oxide
Harper and Luna are working in a hospital and need to sterilize or decontaminate various items. Radiation is a good option when trying to sterilize or decontaminate the following three things:
living tissue
medical supplies
surfaces of operating rooms
water
Daniel is preserving peaches by boiling jars of them for 1 hour. This ______ inactivate/kill endospores.
will
will NOT
Radiation damages ____ of cells.
DNA
plasma membranes
proteins
Filtration is crucial for removing microbes in which of the following scenarios? (select three)
in medical solutions that cannot be sterilized by heat
in drinking water
in laboratory air systems
on surgical instruments
