Fats and lipids, Biology

 

  • Composed of C, H and O (fewer polar OH bonds than carbohydrates)
  • Can be used at energy storage, components of cell membranes, chemical signals & thermal insulation
    • Are a more efficient energy source then carbohydrates
  • 4 families à fats (triglycerides), phospholipids, steroids & waxes

Triglycerides

                                                                                                        2331_fats and lipids.png

Triglycerides - An ester of 3 fatty acids + a glycerol molecule
Glycerol - a 3 carbon alcohol with 3 hydroxyl groups
Fatty Acid - a long-chain carboxylic acid

  • Fatty acids can be saturated of unsaturated and usually even numbered (16 or 18)
    • Saturated -> In animals                                                                                                                                                 Long straight chains and can rotate freely on the glycerol backbone

                      Can be packed tightly together à solids

               o  Unsaturated ->in plants

                        Cannot rotate freely and have kinks in their chain (due to 'cis' & 'trans' shapes from the double bond)

                        Cannot be packed closer together à liquids

Phospholipids

  • Glycerol + 2 fatty acids
  • Has hydrophobic tails and a hydrophilic head

Steroids

  • Hydrophobic molecules with 4 fused hydrocarbon rings (e.g. cholesterol, vitamin D, bile salts)

Waxes

  • Lipids containing long chain fatty acids linked to alcohols or carbon rings
  • Hydrophobic

 

Posted Date: 8/20/2012 4:36:10 PM | Location : United States







Related Discussions:- Fats and lipids, Assignment Help, Ask Question on Fats and lipids, Get Answer, Expert's Help, Fats and lipids Discussions

Write discussion on Fats and lipids
Your posts are moderated
Related Questions
How is the depolarization of the neuronal plasma membrane generated? How does the cell return to its original rest? When the neuron receives a stimulus by the binding of neurot

What are the main characteristics of the age pyramids of developed countries? In a stabilized human population the age pyramid has a narrower base as the reproduction rate is

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

Avian leucosis complex (ALC) The disease in poultry is caused by an RNA virus classified under avian type C Retrovirus group under the family Retroviridae. Epidemiology:

Group Psychotherapy:  Definition  Group psychotherapy  is a treatment of psychological problem in which two or more patients interact in the present of a psychotherapist.

Actions of Gastrointestinal hormones Secretin is released under acidic conditions (low pH); digested fat or bile initiates production of pancreatic juice low in enzymes but ri

Conventional Endodontic Treatment Surgical Endodontic & Retrograde sealing of Immature root Apex: After cleaning and shaping of the RC and before filling , I make a surgical

Explain about the Isoflavones? These are usually treated separately from the other five subclasses and are an area of considerable research interest. Isoflavones are found almo

Menerals are naturally occurring inorganic solids with a crystalline structure and a definite range of chemical formula. Ores are concentrations of minerals in rock.

Explain the Phase Contrast Microscop? Unpigmented and unstained living cells can be easily observed by phase contrast microscope. It has a special objective and a condenser th