A virus consisting of a single strand of RNA, which is reverse transcribed into complementary DNA, is referred to as a ________.
A. bacteriophage
B. retrovirus
C. prion
D. virulent phage
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What is Cas9 and what does it do?
A. a protein enzyme that cuts both strands of DNA at sites specified by an RNA guide
B. a DNA sequence that binds the Cas9 protein
C. an RNA molecule that binds to target DNA via complementary base pairing
D. a viral protein that disrupts bacterial membranes
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