Question

1. explain how a virus makes more of itself.
2. what part of the body does covid - 19 infect?
3. why should people stay home when they are sick?
4. what does a virus inject into a cell?
5. what is a vaccine?
6. name two ways bacteria are helpful instead of harmful.

Explanation:

1. A virus attaches to a host - cell, injects its genetic material (DNA or RNA), hijacks the cell's machinery to replicate its genetic material and produce viral proteins, then assembles new virus particles and releases them.
2. COVID - 19 primarily infects the respiratory system, especially the lungs. But it can also affect other organs in severe cases.
3. People should stay home when sick to prevent spreading germs to others, reducing the risk of infecting healthy individuals.
4. A virus injects its genetic material (either DNA or RNA) into a cell.
5. A vaccine is a preparation that contains weakened or inactivated pathogens, or their components, which stimulate the immune system to produce an immune response and provide immunity against the pathogen.
6. Bacteria are helpful in digestion, as they aid in breaking down food in the gut. They are also used in food production, like in making yogurt and cheese through fermentation.

Answer:

1. A virus attaches to a host cell, injects its genetic material, hijacks cell machinery for replication, assembles new particles and releases them.
2. Primarily the respiratory system, especially the lungs.
3. To prevent spreading germs to others.
4. Its genetic material (DNA or RNA).
5. A preparation containing weakened or inactivated pathogens or their components to stimulate an immune response and provide immunity.
6. Aiding in digestion; used in food production (e.g., yogurt and cheese - making through fermentation).