What does the COVID-19 vaccine cause cells to produce?

• A. Spike protein
• B. Whole virus
• C. Antibodies
• D. Lipid nanoparticles

Answer: (A)

The main idea is that these vaccines teach cells to make a piece of the virus, not the whole virus or antibodies. In mRNA vaccines, the injected mRNA carries the instructions to produce the SARS-CoV-2 spike protein. Once inside cells, the cell’s protein-making machinery translates this mRNA into the spike protein, which is then displayed or released to alert the immune system. This exposure prompts B cells to generate antibodies and activates T cells, building targeted immunity without an infection taking place. The spike protein is the specific viral component the immune system learns to recognize, which is why it’s the correct answer. The lipid nanoparticles are the delivery system, not something the cells produce. The whole virus isn’t produced by this vaccine, and antibodies aren’t produced directly by the cells in response to the vaccine—they’re produced by the immune system as part of the response.