BIOL 2051 Chapter : Ch 17 And 18
Document Summary
Plants - cellulose, protozoans lack a cell wall. 80s ribosomes but functionally similar to ribosomes; formyl-methionine eukaryotes; methionine methionine. Genus 16s ribosomal rna sequence difference of less than 5% are same genus. Species 16s ribosomal rna sequence difference of less than 3% are same species. 7029 prokaryotes recognized; many more out there: binomial system of nomenclature: descriptive genus name & species epithet, ex. Journal of systematic and evolutionary microbiology (ijsem). compilations of bacteria and archaea. Chloroflexi: highly resistant to radiation due to dna repair mechanisms, first isolated from foods sterilized by gamma radiation (1,000 rads of ionizing radiation kills humans; 500,000 rads does not kill. Deinococcus: stains g+ due to thick peptidoglycan layer but has outer membrane like g- (made of lipid polysaccharide, thermus aquaticus- thermophile, taq dna polymerase used in pcr. Streptomyces on body that will produce antibiotics to kill parasitic fungus that kills the leaves: mycobacteria, acid fast due to mycolic acids, some human pathogens.
