Viruses that attack prokaryotes are called
A) bacteriophages.
B) prions.
C) human pathogens.
D) viroids.
E) host cells.
A
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Viruses are very effectively treated with antibiotics
Indicate whether this statement is true or false.
Scientists have found that ancient fossils
a. are very similar to present-day organisms. b. are more similar to present-day organisms than more recent fossils. c. are just as similar to present-day organisms as more recent fossils. d. are less similar to present-day organisms than more recent fossils. e. bear no resemblance to present-day organisms.
DNA replication is always
A) discontinuous. B) bidirectional. C) conservative. D) semiconservative. E) dispersive.
An unknown chemical is analyzed and found to contain the bases thymine and guanine. This chemical is most likely
A. mRNA. B. tRNA. C. DNA. D. rRNA.