Which of the following virus structures contain the receptor sites that allow it to attach to specific sites on a cell?
a) capsule
b) cell wall
c) plasma membrane
d) envelope
e) nucleic acid core
Answer: d) envelope
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Species - as opposed to individuals or populations - are considered the ultimate evolutionary unit because (select all correct choices)
A. new mutations can potentially spread within a species, but not beyond it. B. species can become extinct. C. species give rise to other species. D. changes in gene frequencies over time can only be observed within species, not within populations. E. none of these
The molecules that bind to a repressor and cause it to no longer bind to the operator are called
A. activators. B. repressors. C. introns. D. inducers.
Elastin is found only in insects and some crustaceans and is the most elastic material known
Indicate whether the statement is true or false.
An epidemiologist is investigating a new disease and observes what appear to be bacteria inside tissue cells in clinical samples from victims. The scientist wants to try to isolate the bacteria in the lab. What culture conditions are most likely to be
successful? A) culturing on blood agar plates B) inoculation of EMB plates C) incubation in an anaerobic culture system D) inoculation of cell cultures E) inoculation of a minimal medium broth