AMI IMAGES / SCIENCE PHOTO LIBRARY AMI IMAGES / SCIENCE PHOTO LIBRARY
Bacteriophages attacking bacteria, transmission electron micrograph (TEM) of bacteriophage virus particles (virions, turquoise) attacking a bacterial cell (red). A bacteriophage is a virus that infects bacteria. It consists of an icosahedral (20-sided) head, which contains the genetic material, a tail and tail fibres, which fix it to a specific receptor site. Once attached to a bacterium, the bacteriophage injects its DNA (deoxyribonucleic acid) and the bacterium's cellular mechanisms are used to produce more bacteriophages.
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