BIOL 1107 Lecture 2: Biology Notes Exam 2
Document Summary
According to phylogeny, or evolutionary history, there are three domains: bacteria, prokaryotes, single-celled only, have peptidoglycan, archaea, prokaryotes, single-celled only, many extremophiles, love extreme conditions and temperatures, eukarya, eukaryotes, unicellular and multicellular organisms. The skin of a cell holding everything together. 1 long, coiled dna molecule associated with many proteins. Human cells have 46 (includes x and y: species dependent. 1 long, uncoiled dna molecule associated with many proteins. Tiny complexes that make proteins according to a gene"s instructions. Prokaryotic cells: structural shapes: cells (10-100 m) (spirochetes) Bacterial cell diameters typically range from 0. 5-5 m much smaller than eukaryotic. There are 3 main categories of bacterial shapes: spherical (cocci), rod (bacilli), spiral. Most bacterial cells have one large supercoiled circular chromosome found in the. Prokaryotic cells: genetic information: nucleoid region of the cell. adapting to unusual/stressful environmental conditions (e. g. provide antibiotic resistance). In addition to the large chromosome, many bacteria contain plasmids.
