BIOL 141 Lecture Notes - Lecture 7: Nuclear Pore, Nuclear Lamina, Nuclear Membrane
24 Dec 2016
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Chapter 7: inside the cell: nucleic acids that store info, proteins that perform most of cells function carbs for carbon, chemical energy, support & identity, plasma membrane. Section 7. 1: bacterial and archaeal cells: structure & function (prokaryotes) Organisms" morphologic division into prokaryote & eukaryote. Mostly unicellular: has supercoiled dna in nucleoid. Nucleoid has protein to maintain structure of nucleoid: plasmids: supercoiled dna molecules independent of cell chromosomes. Help cells adapt to unusual environments: photosynthetic prokaryotes have internalized membranes for photosynthesis, cytoskeleton structures cell"s interior, plasma membrane separates living inside from nonliving outside, flagella and fimbriae (needle-like, helps bacteria stick to tissues) aid in movement. Section 7. 2: eukaryotic cell structures & their functions. Eukaryotes: true nucleus w/ dna, can be single celled (ex: yeast). In multicellular organisms: larger than prokaryotes, more cytoskeleton, membrane bound organelles. Downside to larger eukaryotic cell: as cell increases in diameter, volume increases more than surface area (reduction in surface-to-volume ratio decreases permeability)
