In experiments designed as those of Hershey and Chase (1952), 35S was added to a virus replicating within its bacterial host. The new virions were carefully isolated and used to infect fresh bacterial cells in the absence of any radioisotopes. Where would you expect to find the 35S radioisotope?
A) in the phage ghosts
B) in the bacterial matrix proteins
C) in the bacterial DNA
D) in the nucleic acid of the new virions
E) in the protein coat of the new virions
A) in the phage ghosts
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Which is true of competitive inhibition?
A. It involves an allosteric enzyme. B. Substrate and inhibitor both bind to the active site. C.A sulfa antibiotic is a competitive inhibitor. D. Mercury is a competitive inhibitor. E. Substrate and inhibitor both bind to the active site AND a sulfa antibiotic is a competitive inhibitor.
Which of the following organisms can more
likely break down cellulose?
a. a fungus b. a cow c. a human d. a horse e. a plant
There is considerable evidence that community structure is influenced by interactions between species
Indicate whether the statement is true or false
Dyes are often added to growth media to aid in the identification of microbes. What could be the purpose of a dye in this case?
A) to make the plate prettier B) to color key the type of plate being used C) to act as a growth enhancer D) to act as a pH indicator