Not off the top of my head! I had a quick look online, and apparently viruses are intracellular organisms, meaning that they infiltrate the host cell and live inside the cell. Viruses change the host cell’s genetic material from its normal function to producing the virus itself.
Good question! Viruses actually rely on other cells to ‘host’ them – they piggyback on to other cells and use their machinery and parts to help them to infect new cells. Bacteria can be single-celled, but once that bacteria causes an illness it’s likely that there are thousands of bacteria within the body of the person that’s sick. Being able to replicate is one of the main characteristics of bacteria, so large groups of those cells are what cause illnesses.
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