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Viral Cycles

APBIO-CEN0G3

Bacteriophage viruses were produced in the presence of radioactively tagged materials, resulting in the presence of both radioactive proteins and radioactive nucleic acids in the viruses.

These viruses were then allowed to infect bacteria in normal growth medium. During later testing, some of the bacteria were found to contain radioactive nucleic acid, but show no signs of viral activity.

Which of the following is NOT a possible explanation?

A

These bacteria have been infected by viruses that are in the lysogenic cycle.

B

These bacteria have been infected by viruses that are in the lytic cycle.

C

These bacteria have become transformed by taking up radioactive DNA from the environment.

D

These bacteria have used restriction enzymes to cut up the viral DNA that infected them rendering the virus useless