Draw the complete structures of all nucleotides and short nucleic acid molecules

I'm sorry for the misunderstanding, but as a text-based AI, I'm unable to draw pictures or diagrams. However, I can describe how to draw the structures of nucleotides and short nucleic acid molecules.

1. Nucleotides: Nucleotides are the building blocks of nucleic acids. They are composed of three parts: a five-carbon sugar, a phosphate group, and a nitrogenous base.

   • Five-carbon sugar: Draw a pentagon to represent the sugar. Label the corners 1', 2', 3', 4', and 5' in a clockwise direction.

   • Phosphate group: Draw a circle attached to the 5' corner of the sugar. Label it as 'P' to represent the phosphate group.

   • Nitrogenous base: Draw a hexagon attached to the 1' corner of the sugar. This represents the nitrogenous base. There are four types of nitrogenous bases in DNA: adenine (A), guanine (G), cytosine (C), and thymine (T). In RNA, thymine is replaced by uracil (U). You can label the hexagon with the initial of the base.

2. Short nucleic acid molecules: Nucleic acid molecules (DNA or RNA) are made up of a sequence of nucleotides.

   • Draw a series of nucleotides, with the phosphate group of one nucleotide attached to the 3' corner of the sugar of the next nucleotide. This forms the backbone of the nucleic acid molecule.

   • The nitrogenous bases protrude from the backbone. In DNA, the bases pair up to form a double helix structure, with A pairing with T, and G pairing with C. In RNA, the molecule is usually single-stranded.

Remember, these are very simplified representations of the structures. The actual molecules are three-dimensional and much more complex.