Biology 1202B Study Guide - Midterm Guide: Nucleoid, Keratin, Cellular Respiration
Document Summary
Lecture 1- a tour of the cell early microscope: antony van leeunwenhoek single lens- ca. Cell = simplest collection of matter which has all the properties of life: lowest hierarchical level which is alive, cell is basic unit of life, cell performs all functions necessary to live and reproduce. Virus: occur in virtually every kind of organism, some wreck havoc others cause no disease or outward sign of their presence, often highly specific to host. Can reproduce only when they enter a cell. * smaller than cells, attack every known cells, protein and nucleic acid not alive because it cant reproduce in a growth medium must be attached on host. Examples bacteria, cyanobacteria, mycoplasmas, etc. : no nucleus(genetic information in area called nucleoid. , visible components plasma membrane, ribosomes, nucleoid, cytoplasm, cell wall( give shape), pili(sense/hear), flagella( movement), mesosomes, photosynthetic membranes. Bacteria size from about 0. 1 to about 600 m over a single dimension.