1. Education
Send to a Friend via Email
You can opt-out at any time. Please refer to our privacy policy for contact information.

Discuss in my forum

DNA Double Helix

DNA Double Helix

NASA
Definition: DNA (deoxyribonucleic acid) is a type of macromolecule known as a nucleic acid. It is shaped like a twisted double helix and is composed of long strands of alternating sugars and phosphate groups, along with nitrogenous bases (adenine, thymine, guanine and cytosine). It is organized into structures called chromosomes and housed within the nucleus of our cells. DNA contains the genetic information necessary for the production of other cell components and for the reproduction of life.
Examples:
Constructing DNA models is a great way to learn about DNA structure, function and replication.
  1. About.com
  2. Education
  3. Biology
  4. Biology Dictionary
  5. Genetics Glossary
  6. DNA Definition - Biology Glossary

©2014 About.com. All rights reserved.