Quiz 5 Study Guide Micro Lab

Which of the following best describes a microbial control protocol that inhibits the growth of molds and yeast?

fungicidal

fungistatic

bacteriostatic

bactericidal

fungistatic

If you spill Escherichia coli on your hand, what should you use to neutralize it?

aseptic

antiseptic

antibiotic

disinfectant

antiseptic

Which of these disinfectants acts by denaturing proteins?

alcohols

aldehydes

halogens

phenolics

all of the above

all of the above

The efficiency of all disinfectants and antiseptics are influenced by concentration, length of exposure, type of microbial population, and environmental conditions. True or False?

True

All viruses are intracellular parasites. True or False?

True

Which is NOT true of virus capsids?

made up of protein subunits called capsomeres

remain outside of host bacterial cells while the nucleic acid is injected into the bacterial cell

always icosahedral in shape

they surround and protect viral nucleic acid

enters host cells together with the nucleic acid

enters host cells together with the nucleic acid

Viruses cannot reproduce outside of a host cell. True or False?

True

Which of the following is NOT a viral structure?

plaque

collar

capsid

tail fibers

plaque

Which of the following is true about viruses?

All viruses contain DNA or RNA

All viruses contain RNA

All viruses contain DNA

All viruses contain DNA and RNA

All viruses contain DNA or RNA

Penetration involves:

the enzymes present in the phage tail

the tail fibers of the phage

a noncellular infectious agent

using the cells synthetic machinery for production of new phage components

the enzymes present in the phage tail

All viruses are intracellular parasites.

True

False

True

A plaque is:

the enzyme present in the phage tail

a noncellular infectious agent

a complete set of virus hereditary material

a clearing in the lawn of bacteria caused by lysis

a clearing in the lawn of bacteria caused by lysis

Which of the following chemicals has been applied to the eyes of newborn humans to prevent gonorrhea?

iodine

alcohol

detergents

heavy metal

heavy metals

A large zone of inhibition always means that the chemical agent is more effective than another chemical agent with a smaller zone.

True

False

False

Unlike a disinfectant, an antiseptic:

can be used in food products

requires heat to be effective

sanitizes objects rather than sterilizes them

destroys all microorganisms

is nontoxic enough to be used on human tissue

is nontoxic enough to be used on human tissue

Ethanol works as a disinfectant because:

it requires heat to be effective

it binds to cellular enzymes and inactivates them

it dehydrates cells

of strong oxidation

it dehydrates cells

All viruses are intracellular parasites.

True

False

True

Each plaque forming unit represents the lysis of a phage infected viral cell.

True

False

False

Which of the following pairs is mismatched?

genome - a noncellular infectious agent

capsid - protein coat of virus

penetration - enzymes lyse the host cell wall and allow the viral nucleic acid into the host

tail fibers - bind to the host's cell wall

genome - a noncellular infectious agent

Alcohol that is used on the skin is a type of:

disinfectant

herbicide

skin culture

antiseptic

sterilant

antiseptic

Bacteriostatic agents kill bacteria.

True

False

False

Which of the following chemicals has been applied to the eyes of newborn humans to prevent gonorrhea?

alcohol

heavy metal

detergents

iodine

heavy metal

Detergents kill microorganisms by:

precipitates proteins

bind to cellular enzymes and inactivate them

denature enzymes and destroy membranes

breaking down cell walls

denature enzymes and destroy membranes