17. The base composition of nucleic acids isolated from a unknown virus was found to contain 20% A,30% T, 30% G and 20% C. The nucleic acid of this virus is likely:
(A) single-stranded RNA
(B) double-stranded DNA
(C) single-stranded DNA
(D) double-stranded RNA

1. 題目解析這道題目要求我們根據未...