2. DNA and RNA
contain information that will determine their physical and
chemical characteristics.
A DNA is a double helix molecule composed of
complementary strands of deoxyribonucleotides units. The
complementary base pairs of the DNA are held by
hydrogen bonds.
RNA is single stranded.
Examples of RNA types include: mRNA, rRNA and tRNA.
In DNA, adenine always bonds with thymine, and cytosine
bonds with guanine. In RNA, adenine bonds with uracil,
and cytosine bonds with guanine.