All tissues in the body rely on chemical reactions and biological molecules. Biochemistry is looking at reactions in the cellular level. Dogma first proposed by crick first just a theory but now after many years of experiment it is dogma. Dna is used as a template to form rna (single strand) and through translation protein is made. The flow of information starts out at a dna level and works its way through rna to proteins. Dna tells what type of protein to make. Introduces to 2 pieces of terminology genotype and phenotype. 2 large muscles separated by connective tissue rectus abdominus if the 2 lowest muscles are short you can t have an 8 pack. Some people are genetically disposed to having low body fat. Difference in physiology makes it difficult to have an 8 pack. Anti histamines use a certain brand depending on how your body reacts to certain compounds.