5' end becomes a multimeric chromosome. Sense codons - code for amino acid. Any other place except at the start of a gene, AUG codes of methionine. Reading frame - From the start codon to the termination codon. Wobbling make the third nucleotide of a codon somewhat non-specific.
Some genes overlap, some are split genes.
Exons - Coding segments. Leader segment - Precedes the sequuence coding for structural genes. Promoter - A sequence of DNA upstream from the transcription start site, leader sequence and structural genes. The promoter is not transcribed. Consensus sequence - does not vary very much from one organism to another.