27. Which of the following characteristics correctly describes retroviruses?
(A)They are made up of only a single protein.
(B)They can only reproduce by infecting bacteria.
(C) They have a single-stranded DNA that acts as a template for DNA synthesis.
(D) They have a single-stranded RNA that acts as a template for DNA synthesis.
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統計: 尚無統計資料
統計: 尚無統計資料