CHEN 3701 Lecture Notes - Lecture 2: Transfer Rna, Lotherus, Ath
14 Sep 2015
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No single definition for a cell but the most cited one: fundamental unit of life. Features of an organism and a cell (since some organisms are single cells) Energy utilization (get energy from light) (energy from chemical compounds) (get carbon from co2) (gets carbon from organic compounds) (energy from inorganic compounds) How do cells utilize energy (whether it be from light or chemical compounds) The energy is utilized for: synthesis of macromolecules. Cellular locomotion: transport molecules against a concentration gradient (not passive diffusion, generation of electric potential across a membrane, generate heat. 2 classes: eubacteria (much more common within prokaryotes in general), archaeabacteria (tend to be found/more common in harsh environments) (include halophiles - high salt (3-5 m nacl)thermophiles (high t (55 - 100 degrees c)low ts too), methanogens - ch4) Surrounded by a plasma membrane: phospholipid bilayer (3-8 nm thick) hydrophobic tails hydrophile aqueous (inside)
