exam 3- practice test 1 Flashcards
Enzyme that is responsible for synthesizing RNA
transcriptase
DNA directly participates in
replication and transcription
Genetic and metabolism are tied together by the fact that:
the genes code for enzymes that catalyze reactions that result in characteristics
All of the following bases are found in RNA except:
- adenine
- cytosine
- guanine
- thymine
- uracil
thymine
always a change in base sequence and sometimes a change in amino acid sequence
silent mutation
The codon, UGA, would function as a stop codon on
mRNA
Product of translation
a protein (polypeptide)
Which require(s) living donor and recipient cells:
conjugation only
Erectile dysfunction can be caused by
cigarette smoke
The following use(s) sex pheromones
gram-positive conjugation
Which of the following is due to a mistake in packaging of DNA
transduction
Chemicals in cigarette smoke that selectively cause cells with a mutation to replicate more than cells without a mutation are called
promoters
Restriction enzymes are important because they
generate overlapping sticky ends on DNA
A method of one-way gene transfer that requires cell-to-cell contact is
conjugation
Which are not methods of sterilization
pasteurization and lyophilization
Endospores have resistance to some levels of ionizing radiation because they are
desiccated
If you were asked to sterilize a heat-sensitive item (and not cause damage to the item), which of the following would be most suitable
ethylene oxide (carboxide)
Membrane filtration:
does not necessarily remove viruses
Major targets for disinfectant action include:
cell proteins and cell membranes
The most practical and efficient method of physical control is:
heat
Which term refers to a chemical that is used at safe levels in accordance with public health requirements:
sanitizer
The chemical that is the active ingredient in lysol is:
cresol
the difference between an antiseptic and a disinfectant is:
antiseptics are typically used on the skin
criteria for usefulness of an antimicrobial agent does NOT include
destruction of normal flora
a chemical that is not used much anymore because it is carcinogenic is
formaldehyde
the most famous antibiotic, the first one discovered, one that inhibits bacterial cell wall synthesis, is
penicillin
an example of a chemically-synthesized chemotherapeutic agent is:
sulfonamide
is a chemical agent that is the product of some organism’s metabolism
an antibiotic (by definition)
for a non-growing (stationary phase) bacterial culture, which should be most effective as an antimicrobial agent?
polymyxin B
what is the drug of choice to treat anthrax
cipro
measures to minimize drug resistance include
discriminate use, drug dose high and combination of drugs
conceivably, the most common mechanism of microbial resistance is:
alteration of target molecule
many cases of the flu on a college campus would be referred to as a(an
epidemic
which of the following is a factor in the development of disease?
- number of pathogens
- vector
- ability to flourish outside of the body
all of the above
cholera, a very serious disease in many areas of the world, is normally transmitted via the
gastrointestinal tract
an example of a disease normally transmitted via the blood is:
hepatitis
a disease organism that is present in high numbers in a specific geographical location is referred to as an
endemic
which organism requires fimbriae to stick to the lining of the genitourinary tract?
- S. pneumoniae
- HIV
- the bacterium that causes cholera
- E. coli
E.coli
what has been shown to remain active and infectious for hours on a toilet set?
herpes virus
which of the following diseases requires a tick vector for transmission
rocky mountain spotted fever
