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

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.

An example of a base pair is adenine pairing with thymine. This occurs in the DNA molecule. Adenine forms two hydrogen bonds with thymine, allowing them to pair together.

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.

DNA Replication Models The structure of DNA, deoxyribonucleic acid, is composed of nucleotides. Each contains a deoxyribose molecule, a phosphate group, and a nitrogen-containing base.

This DNA strand model shows the double helix shape. DNA stands for deoxyribonucleic acid and is the structure that contains all the hereditary information for humans and most living organisms.

Understand how DNA is replicated. Learn why DNA replicates, when DNA replicates, and how DNA replication works. Get an overview of the rates of replication of different cells.

The phosphate group present in the nucleotide creates a covalent bond with the sugar molecule of the adjacent nucleotide to form a long chain of the nucleotide monomers.

DNA and RNA are two types of polynucleotide molecules found in the cell. A polynucleotide chain has a sugar-phosphate backbone with nitrogen bases attached to every sugar molecule.