What are mutations? a)changes in nucleotides of a dna molecule that affect the genetic message b)repairs of damage to dna molecules by specialized enzymes c)removal of damaged dna nucleotides by enzyme molecules d)reduction in the rate of replication of dna due to regulatory mechanisms

Which of the following matches the organisms described with the correct domain? a. archaea--multicellular, eukaryotic organisms that do not have cell walls b. eukarya--single-celled and multicellular organisms, with a defined nucleus and a variety of nutritional sources c. bacteria--unicellular, eukaryotic organisms with cell walls that do not contain peptidoglycan d. bacteria--unicellular, eukaryotic organisms that always lack cell walls