Matching Pairs Info Project By alex Christensen

Composition of DNA

DNA is shaped as a double helix. Which is a twisted ladder shape. DNA is a nucleic acid which is made up of nucleotides. A nucleotide is made up of a nitrogen base, sugar and phosphate. The four nitrogen bases are adenine, guanine, cytosine, thymine. The variety of nitrogen bases cause the genetic diversity. There are rules to pairing. Adenine can only pair with thymine and guanine can only pair with cytosine.

Double Helix DNA strand


The four bases mentioned earlier are classified in two different categories for size. Purines and Pyrimidines. Purines is the larger category with the double ring structures. Purines contains adenine and guanine. Pyrimidines is the smaller category with the single ring structures. Pyrimidines contains Thymine and cytosine. Purines can only pair with Pyrimidines and visa versa.


The bonds between the two strands of DNA vary between the bonds of Adenine and Thymine and between Guanine and Cytosine. Adenine and Thymine have 2 hydrogen bonds whereas Guanine and Cytosine have 3 hydrogen bonds.


Created with images by snre - "DNA lab" • Peter Alfred Hess - "#double #helix #dna #pattern" • Arenamontanus - "DNA" • Art Poskanzer - "DNA"

Made with Adobe Slate

Make your words and images move.

Get Slate

Report Abuse

If you feel that this video content violates the Adobe Terms of Use, you may report this content by filling out this quick form.

To report a Copyright Violation, please follow Section 17 in the Terms of Use.