This article is about the aqueous solution. For the gas, see hydrogen chloride. Hydrochloric acid is a corrosive, strong mineral acid with many industrial uses. A colorless, highly pungent solution of hydrogen chloride (HCl) in water, when it reacts with an organic base it forms a hydrochloride salt.
Bacteria are intercellular organisms (i.e. they live in-between cells); whereas viruses are intracellular organisms (they infiltrate the host cell and live inside the cell). They change the host cell's genetic material from its normal function to producing the virus itself.
Bacteria and viruses are very small organisms. Bacterial cells do not have a nucleus, and most have no organelles with membranes round them. However, they do have DNA, and their biochemistry is basically the same as other living things. A virus, on the other hand, is a tiny parasite which can infect living organisms.