What is unique about the Hepadnaviridae family of viruses?
A) They contain RNA.
B) They contain double-stranded RNA.
C) They contain single-stranded DNA.
D) They contain double-stranded DNA.
E) They contain both single-stranded DNA and double-stranded DNA.
E
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On the basis of the principle of complementary base pairing, you would expect the percentage of _____ to be equal to the percentage of _____.
a. adenine ... thymine b. adenine ... guanine c. thymine ... guanine d. adenine ... cytosine e. thymine ... cytosine
In light of the phylogenetic evidence that feathers evolved prior to flight, what might have been the original function of feathers?
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