Which of the following bacteria is gram-positive?
A) Pseudomonas
B) Salmonella
C) Streptococcus
D) Bacteroides
E) Rickettsia
C
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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.
On March 10, 2004, National Public Radio reported that "forests in a remote part of the Amazon are suddenly growing like teenagers in a growth spurt." Though, the radio report added, "This shouldn't be happening in old, mature forests." This unexpected growth could be caused by:
What will be an ideal response?
Will is a graduate student working in a microbiology lab. He is given the task of characterizing a newly discovered nitrogen fixing bacterium. What type of tests or observations will help him determine whether it is a member of the Cyanobacteria,
alphaproteobacteria, or gammaproteobacteria? What will be an ideal response?
All of the following are part of the mechanism of action of alpha and beta interferons EXCEPT
A) they bind to the surface of uninfected cells. B) they are effective for long periods. C) they initiate manufacture of antiviral proteins. D) they disrupt stages of viral multiplication. E) they initiate transcription.