Learn about DNA base pairs. Discover the 4 bases of DNA and how they pair up, how many hydrogen bonds connect the two bases, and how RNA base pairings differ.

Learn about the structure of DNA base pairs. Identify the molecular structure of DNA, study DNA diagrams, and discover the contributions of the Human Genome Project.

Learn about the DNA bases adenine, thymine, guanine, and cytosine. Discover which bases pair with each other, known as DNA complementary bases and what they do.

What is a nitrogenous base? Learn a nitrogenous base definition and see the list of nitrogenous bases, plus see the nitrogenous base pairs in DNA and RNA.

This lesson will explain nitrogenous bases, types of bases, and complementary base pairs in both DNA and RNA. It will also cover the rules of base pairing and provide examples.

Study pyrimidine bases, and learn how they differ in DNA and RNA structures. See examples of pyrimidine bases, along with their structural forms in DNA and RNA.

Understand the experiments of Erwin Chargaff and what he discovered. Learn Erwin Chargaff's Rules about DNA's nitrogenous bases. Find what he contributed to DNA.

The four DNA nucleotide bases - A, T, G, and C - (or A, U, G, C in RNA) can be arranged as 3-base long sequences, in 64 different ways. In this diagram, we can find all 64 possible codon …

What are purines in DNA? Understand what purines are and how they are different from pyrimidines. Learn about the structure of purines and view some examples.

Learn about the function of helices in DNA replication. Know the DNA double helix definition. Discover DNA unwinding enzymes, with diagrams.