Most Important MCAT Topics From Biology Part 1 & Chp. 2 Part 2

Most Important MCAT Topics From Biology Part 1 & Chp. 2 Part 2

LIPIDS:-
*Hetrogenous Group Of      Compounds,Related To Fatty Acids
*Insoluble in WATER
*Soluble in Organic Solvents
    e.g; oils,fats,wax,cholesterol etc

MCQS
           Lipid Has Double Amount Of Energy Than Carbohydrates,Because Of High Proportion of……

ANSWER
      C-H Bond and Low O₂ Proportion


CLASSIFICATION OF LIPIDS

Lipids are classified as:

*Acylglycerol
*waxes
*Phospholipids
*Sphingolipids
*Glycolipids
*Terpenoid lipids

*Acylglycerol:_

Glycerol + Fatty acids = Acylglycerol

MCQS
   Most Widely spread acylglycerol is:

ANSWER
     Neutral Lipid Or Tri-Glycerides

 NOTE:   
Must remember It’s Example as given Below:
C₂H₅OH + CH₃COOH---àC₂H₅COOCH₃ +H₂O
Alcohol    Acetic acid         Ester           Water

NOTE
      OH  is Released From ALCOHOL and H from an Acid..
 H and OH Combine To Form H₂O….

*Fatty Acids Contain Even Number (2-30) carbon atoms in straight chain.

 Note:
     Remember some Fatty acids with Their carbon atoms
e.g:
    Acetic Acid = 2  carbons
   Butyric acid = 4 carbons
   Palmitic acid = 16 carbons
   Oleic acid = 18 carbons


* Fats And Oils Have Specific gravity :
ANSWER = 0.8

MCQS
     IN Oleic Acid Un-Saturated Double Bond Is Present Between:

ANSWER
         C₉-C₁₀ (between carbon number 9 & 10)

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