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Did you know?

The human body produces and destroys 15 million blood cells every second.

Did you know?

Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.

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HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.

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The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).

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For about 100 years, scientists thought that peptic ulcers were caused by stress, spicy food, and alcohol. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids. Now it is known that peptic ulcers are predominantly caused by Helicobacter pylori, a spiral-shaped bacterium that normally exist in the stomach.

Three bonds separate sequential α carbons in a polypeptide chain Three bonds separate sequential α carbons in a polypeptide chain
Relationships of DNA to mRNA to polypeptide chain Relationships of DNA to mRNA to polypeptide chain
The polypeptide II helix The polypeptide II helix
An orange has four times the fiber of six ounces of orange juice An orange has four times the fiber of six ounces of orange juice
Fiber Has Many Health Benefits Fiber Has Many Health Benefits
Polypeptide Structure Polypeptide Structure
Video: Hormones and the menstrual cycle Animation

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