This is a free sample. For full access
Biological Evolution: Unity and Diversity: Microorganisms and Their Roles
Viruses
Description
Viruses
Viruses are microscopic infectious agents that can replicate only inside the living cells of organisms. Unlike bacteria or eukaryotic cells, viruses are not considered living organisms because they lack cellular structure and cannot carry out metabolic processes on their...
Show More
Transcript
Ever wonder why you catch a cold with the flu? The culprit is usually a virus—tiny, invisible particles that infect people and animals.
Viruses come in various shapes, like spiky spheres, rods, helices, or even spaceship-like forms, and are only visible under powerful microscopes.
Despite their size, viruses cause illnesses ranging ...
Show More