bio ch3 important molecs

  1. Proteins
    • -made of aa
    • -peptide bond
    • various functions

    • -condensation rxn
    • amine on one end carboxyl on other
    • R functional group gives it characteristics
  2. protein structures
    • Primary; linked by peptide bonds, aa sequence
    • secondary; h-bonds btwn amine and carboxyl groups, helices and pleated sheets
    • tertiary; interactions btwn R-groups; electrostat. attractions, disulfide bridges, h-bonds, hydrophobicity
    • quatrenary; more than 1 polypep chain
  3. carbs
    • made of monosaccharides¬†¬†
    • polymer, condensation rxn
    • glycosidic linkage
    • energy souce
    • starch has branching w 1,6 and 1,4 links, alpha gluc
    • glycogen has branching, alpha gluc
    • cellulose is beta glucose
  4. lipids
    • methane one end carbonic acid on other
    • not polymers
    • bilayer, fat, cholesterol-steroid backbone
    • hydrophobic
  5. lipid structure
    • forms micelles (round) cus of hydrophobicity
    • can be saturated (all single bonds, max H), or unsat (dble bonds)
    • cis unsat (Hs on same side of dble bond) gives molecule a kink so less packing
  6. types of lipids
    triglycerids; 1 glycerol, 3 FAs by esterification. inert form for FAs

    • terpenes; class of molecs built from isoprene (C5H8)n
    • steroids; have 4 ring cholesterol structure. mainly hydrophobic
  7. plasma memb fluidity affectors
    • Low temp: memb will lose fluidity so u can increase unsat (make them kink so they bond less tight), shorten the FA chain (pack less tight), and add cholest.
    • High temp: memb will be too fluid and melt so add sat (pack closer), long chains (pack closer), add cholest.
  8. nucleic acids
    • -phosphodiester bond btwn 3'carbon and 5' phosphate
    • nucleotide has¬†nitrogenous base, phosphate, and pentose sugar
    • deoxyribose has 1 less oxygen on C2
    • for energy or DNA/RNA
    • anhydride bonds is bond btwn phosphates, very energetic
Card Set
bio ch3 important molecs
ch3 of bio cards