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 Virus – They have a protein capsule with a
genetic core hence need a host to live in.

Antibiotics

 These are the chemicals (medicine, drugs) that block biochemical pathways
important for bacteria. They are used for diseases caused by bacteria. For

example, penicillin,flucloxacillin, amoxicillin, Cephalosporins, cefadroxil,
Tetracyclines, sulfonamides etc.

 Antibiotics do not work against viral infections as the viruses do not have their

own biochemical mechanisms but depend upon that of the host. Despite this
limitation, there are now effective anti-viral drugs, for example, the drugs that

keep HIV infection under control.
:

Penicillin and its functioning

 Penicillin was first ever “true”
antibiotic and it was

discovered by a Scottish
bacteriologist, Alexander

Fleming.

 The antibiotic penicillin blocks
the bacterial processes that

build the cell wall. As a result,