Cellular and microscopic biology allow scientists to study cells and microorganisms. Cellular biology is the study of cells, including their structure and function. Microbiology is the study of microorganisms, which include algae, bacteria, and viruses.


Globigerina, a genus of marine protozoans (one-celled organisms). The globigerina resembles the amoeba in structure, but has a spiny, multichambered shell composed of calcium carbonate.

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    10 Misconceptions About the Flu

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    10 Oldest Known Diseases

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    10 Weirdest Sources for Antibiotics

    Worried that we're running out of effective antibiotics? Never fear. Scientists are plundering cockroach brains and other surprising sources to create new lifesaving medications. See more »

  • A Germ by Any Other Name: 'Stomach Flu' and Other Medical Misnomers

    A Germ by Any Other Name: 'Stomach Flu' and Other Medical Misnomers

    Most of us know what causes a case of the Mondays or tennis elbow -- Mondays and racquet sports -- but what about other conditions and illnesses? You can't always judge a disease by its name. Do you know what causes the stomach flu? See more »

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    Does your body really replace itself every seven years?

    That bully who tormented you in school might not seem to have changed much when he put you down at the 10-year reunion. But he's practically a whole new person. See more »

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    Has a video game cured HIV?

    Molecular biology isn't all fun and games -- except when it is. How did a bunch of gamers handily solve a decade-old problem in three weeks flat? See more »

  • How AIDS Works

    How AIDS Works

    Many world leaders agree that we're losing the war on AIDS. AIDS is one of the deadliest human diseases ever -- worldwide, it claims approximately 5 lives every minute of every day. Learn how the AIDS virus attacks the body. See more »

  • How Bacteria Work

    How Bacteria Work

    Bacteria are both friend and foe to humanity. They cause and cure health problems, make rotting food stink and give sourdough its delicious taste. Find out how these countless tiny microbes accomplish all of this and more. See more »

  • How Biofilms Work

    How Biofilms Work

    Biofilms form when single microorganisms attach to a hydrated surface and undergo a "lifestyle switch." But why should we care about biofilms? See more »

  • How Bird Flu Works

    How Bird Flu Works

    If you've kept up with the news lately, you've probably heard dire warnings about avian flu, or bird flu. In this article, we'll review the basics of how viruses and influenza work, and we'll learn the answers to these and other questions about avian flu, including whether it is likely to cause a global flu epidemic. See more »

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