Would you expect the number of virions to be the same if you measured them by the plaque assay or by counting using the electron microscope? Why?
A. Yes-both methods measure the total number of virus particles in a solution.
B. No-the plaque assay only measures viable virus particles, while the electron microscope cannot distinguish between defective and viable virus.
C. No-you cannot count virus particles by using a plaque assay. You can only get a relative difference in quantity from one preparation of virus particles to another with this method.
D. Yes-only fully functioning viruses will be released from a host cell, so the quantified number of virus particles in a plaque assay should be identical to the number of free virus particles counted by electron microscopy within a given preparation.
B
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How is ATP produced during fermentation?
A. Oxidative phosphorylation B. Substrate-level phosphorylation C. Use of proton motive force to drive ATP synthase D. Cyclic phosphorylation E. Chemosynthetic phosphorylation
In which of the stages below are the chromosomes present as attached sister chromatids? I. metaphase II. telophase III. prophase IV. anaphase
a. III and IV b. I, III, and IV c. I and III d. I, II, and III e. I, II, III, and IV
You might expect to see an example of the founder effect in:
a. the Hawaiian Islands. b. Central Africa. c. states along the Mississippi River. d. a tropical rain forest. e. China.
One summer, bird watchers and zookeepers in a major city notice that more birds than usual are dying. At the same time reports of human encephalitis cases increase sharply. The cerebrospinal fluid of human patients is clear. Similar enveloped RNA virus
particles are detected in samples from both birds and humans. Which of the following might be responsible for this outbreak? A) an arbovirus B) coxsackie A virus C) Cryptococcus neoformans D) Neisseria meningitidis E) rabies virus