Let me give you a taste of "simple" molecular biology right now.
By using "Molecular Biology Made Simple and Fun" PDF guide, you'll:
DNA (Deoxyribonucleic Acid) is a long, twisted ladder called a double helix. The "rungs" of this ladder are made of four chemical bases: (Adenine) T (Thymine) C (Cytosine) G (Guanine)
The book typically follows the "central dogma" of molecular biology—DNA makes RNA makes protein—while expanding into modern biotechnology: Molecular Biology Made Simple And Fun - Amazon.com