Thymine is a nitrogen base found in DNA but not in RNA.

DNA replication is conservative.

Chargaff determined that adenine and cytosine were likely paired together, while thymine and guanine were paired together.

A nucleotide consists of a five-carbon sugar, a nitrogen base, and

a phosphate group.

In DNA replication, the leading strand is replicated in short

segments called Okazaki fragments.

Each end of a double stranded DNA molecule contains a 5’ end

on one strand and a 3’ end on the complementary strand.

Watson and Crick were the only people responsible for

determining the physical structure of DNA.

A DNA sample that contains 34% adenine nucleotides will

contain 16% cytosine nucleotides.