3.16B describe a DNA molecule as two strands coiled to form a double helix, the strands being linked by a series of paired bases: adenine (A) with thymine (T), and cytosine (C) with guanine (G)

- DNA is a double helix with two strands: template strand and non-template strand.

- the template strand of DNA forms a framework upon which a molecule of mRNA is formed. This is where transcription will take place.

There are 4 bases in DNA: Adenine, cytosine, guanine, thymine.
A always pairs with T, C always pairs with G