<h2>Proteins</h2>
Proteins are polymers, and they contain C, O, H, N, and sometimes S, depending on the R-group of the amino acid. The monomer of proteins are Amino acids. Amino acids have two functional groups, carboxyl and amine groups. The other one is the R-group, and there are 20 possible types of them. Proteins are important, and they can be used as biocatalysts, vital in cell membrane, etc.
<h2>Nucleic Acids</h2>
There are two types of nucleic acids, DNA and RNA. DNA, or deoxyribonucleic acid, has a pentose sugar, deoxyribose which is covalently connected to a phosphorous (connected through phosphdiester bond), and a nitrogenous base. There are four possible nitrogenous base, and they can be purines (double ringed, A and G ) or pyrimidines (single ringed, C, T, and U in RNA). DNA has a phosphorus and carboxyl group. The monomer for any nucleic acid is called a nucleotide.
RNA has a few major differences from DNA. RNA's pyrimidine is uracil instead of thymine. Also, the pentose sugar for RNA is simply ribose. This means that there is a -OH in the pentose sugar.
Proteins and Nucleic acids work side-by-side in DNA replication. They also have many other uses too.
