Explain the biochemical evidence for the common ancestry of living organisms.

DNA/RNA found in all living organisms/genetic code is universal;

amino acids all L- not D- isomers;

same 20 amino acids/proteins found in all living organisms;

involves comparing similarities and differences in the amino acid sequence of the same molecule;

e.g. hemoglobin;

involves comparing base sequences of variable regions of DNA;

e.g. mitochondrial DNA;

the more similar the base/amino acid sequence, the more closely related;

comparing amino acid sequences that result in the phenotype/comparing DNA sequences that result in the genotype;

evidence for molecular evolution in drug resistance;