Biochem: Lipids

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Cards (59)

  • a class of biological molecules defined by low solubility in water and high solubility in non-polar solvents
    lipids
  • lipids may be ___ or ___ (possess both polar and non-polar groups)
    hydrophobic, amphipathic
  • lipids have ___ attraction between other lipids molecules
    London dispersion
  • For Lipids, lesser surface area of contact of one molecule to another will result to ___
    lower IMFA
  • carbon bonds makes saturated fatty acids ___ molecules
    extremely flexible
  • Unsaturated fatty acids have ___ melting points than saturated ones
    lower
  • essential FAs: linoleic (___) and linolenic (___) acids
    Omega-6, Omega-3
  • Short-chain fatty acids have ___, whereas long-chain fatty acids are ___
    some solubility, insoluble
  • Found in adipocytes, major energy reserve and the principal neutral derivatives of glycerol found in animals
    Triacylglycerols
  • Triglycerides rich in unsaturated fatty acids are generally liquid at room temperature and are called ___
    oils
  • Triglycerides rich in saturated fatty acids are generally semisolids or solids at room temperature and are called ___
    fats
  • What hydrolyzes TAGs to become DAGs and MAGs?
    lipase
  • Addition of hydrogen across C–C multiple bonds, which increases degree of saturation
    Hydrogenation
  • Leads to C=C breakage that produces both aldehyde and carboxylic acid products
    Oxidation
  • Odor released due to oxidation
    rancid
  • Phospholipids contain: ___, ___, and ___
    one or more fatty acids, a phosphate group, and an alcohol
  • Differences of glycerophospholipids to TAGs:
    1. function as components of cell membranes
    2. polar
  • If the other alcohol is choline, the glycerophospholipid is called a ___
    phosphatidylcholine (lecithin)
  • linkage between sphingosine and FA
    amide
  • linkage between sphingosine and monosaccharide or oligosaccharide
    glycosidic linkage
  • Simplest sphingoglycolipids; Occur primarily in brain (7% of dry mass)
    Cerebrosides
  • Complex sphingoglycolipids; Occur in the gray matter of the brain and in the myelin sheath
    Gangliosides
  • Such is the case for ganglioside GM2 in the brains of ___ victims.
    Tay-Sachs disease
  • Arachidonic acid (20:4) derivatives; hormone-like molecules; have a very short “life”
    Eicosanoids
  • Three hormones produced by arachidonic acid (eicosanoids):
    prostaglandins, thromboxane, leukotrienes