1) What type of genome does the SARS-CoV-2 virus have? a) Single strand of positive-sense RNA b) Double strand DNA c) Single strand of negative-sense RNA d) It's a RETROVIRUS: single strand of positive-sense RNA 2) How do the mRNA vaccines work? a) Vaccines also known as subunit vaccines, they contain only a part of the virus or bacterium, usually a protein, which is sufficient to trigger the immune system b) An artificial sequence that encodes for a protein (e.g., Spike) is injected into the human body. The cells produce the viral protein. The immune system recognizes this protein as foreign and starts producing antibodies. c) They use a harmless virus as a shuttle to transport the gene that codes for a protein of the target virus into the body. The body produces the protein and develops an immune response. d) Vaccines that contain the inactivated virus (it can't replicate)

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