19. Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) belong to which kind of virus? (A) single-stranded DNA virus. (B) double-stranded DNA virus. (C) single-stranded RNA virus. (D) double-stranded RNA virus.

5. Which of the following statements is INCORRECT for retroviruses? (A) They are enveloped RNA virus. (B) They encode reverse transcriptase and replicate through a DNA intermediate. (C) Some of them produce tumors in the infected animals. (D) Retroviruses include human immunodeficiency virus (HIV) which primarily infects CD8 T cells.

19. Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) belong to which kind of virus?
(A) single-stranded DNA virus.
(B) double-stranded DNA virus.
(C) single-stranded RNA virus.
(D) double-stranded RNA virus.

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