28. There are varieties of vaccines developed and available for preventing COVID-19 infection EXCEPT (A) Messenger RNA vaccine (B) Vector vaccine (C) Protein subunit vaccine (D) tRNA vaccine

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.

28. There are varieties of vaccines developed and available for preventing COVID-19 infection EXCEPT
(A) Messenger RNA vaccine
(B) Vector vaccine
(C) Protein subunit vaccine
(D) tRNA vaccine

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