3.2 Phosphodiester bonds link nucleotides to form a single strand of DNA A strand of DNA has 2 different ends 5' end contains a phosphate group 3' end contains a hydroxyl group DNA Structure - A Double Stranded Helix See Fig. Single stranded 2. Contains ribose rather than deoxyribose 3. The base uracil occurrs in place of thymine Three types of RNA 1. DNA Replication See Figs.
Most amino acids have more than one codon.
DNA segment that contains the codons specifying the sequence of amino acids of a protein. Also contains additional information that affects its expression See Fig. 3.10 Expression of a gene involves two main processes 1. Introns are removed from the primary transcript by mRNA processing before translation. Ribosome structure and composition in prokaryotes 1.