A virus consisting of a single strand of RNA, which is transcribed into complementary DNA, is a _____
A) reverse transcriptase
B) protease
C) retrovirus
D) RNA replicase virus
E) nonenveloped virus
Answer: C
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Who used radioactively labeled T2 bacteriophage to confirm the identity of the transforming principle?
A) Griffith B) Hershey and Chase C) Avery D) Gierer and Schramm E) Beadle and Tatum
In 2005, a strain of extremely drug-resistant bacteria was isolated from a man in New York City. Public health officials braced themselves for many more cases, but they never appeared. What is the most likely explanation?
A) The strain must have reverted back to a sensitive strain in order to keep infecting more people. B) The strain may have been less fit in other ways and thus not successful in the population. C) The strain must have become extinct. D) The strain must have been dormant and was waiting for the right conditions to reappear.
Which one of the following is true regarding viruses?
a) Virions contain both DNA and RNA. b) They multiply by binary fission. c) They are sensitive to antibiotics. d) They are not composed of cells.
Why might spinach be more nutritious than iceberg lettuce?
What will be an ideal response?