Listen class: a nucleotide is a molecule consisting of a nitrogen containing base. Such as adenine, guanine, thymine, or cytosine.
Deoxyribonucleic Acid or DNA is made up of two polynucleotide chains. This stores, copies, and distributes genetic information. Base pairs are two chemical bases (such as adenine and thymine) that forms a rung on the DNA double helix.
Replication is the process in which a double helix DNA molecule is copied to create two identicle molecules. DNA helicases are enzymes that bind nucliec acid. DNA polymerase causes replicaiton. Chargraff's ruel states that A should be equal to T and C should be equal to G.
Semi-conservative repicaiton is the process that creates two copies. Each of which contain one original strand and one new one.