NextPrevious

DNA, RNA, Chromosomes, and Genes

DNA and RNA

What are the nitrogenous bases of DNA?

The four nitrogenous bases in DNA are adenine (A), thymine (T), cytosine (C), and guanine (G). These are further divided into two types based on their structure: thymine and cytosine (called pyrimidines) have single-ring structures, while adenine and guanine (called purines) have double-ring structures. A double-ring base is always paired with a single-ring base on the opposite strand.



Close

This is a web preview of the "The Handy Biology Answer Book" app. Many features only work on your mobile device. If you like what you see, we hope you will consider buying. Get the App