Most Important MCAT Topics From Biology Part 1 & Chapter 2 Part 5

Most Important MCAT Topics From Biology Part 1 & Chapter 2 Part 5     

  STRUCTURE OF PROTEIN:*For Proteins There Are 4 Level Of Organizations:
a:Primary Structure:
b:Secondary Structure:
c:Tertiary Structure:
d:Quaternary Structure:(A): Primary Structure:
It Comprises:
-->Number & Sequence Of A.A in Protein Molecule
e.g:                             21 A.A in First Chain
      INSULINE:---- 
      (51 A.A)                30 A.A in Sec. chain
Example No 2:
Haemoglobin Has 4 Chain ( 2 alpha and 2 beta)
 *Each Alpha Has (141 A.A)
 *Each Beta Has (146  A.A )

MCQS:Haemoglobin Has How Much Amino Acids In All 4 Chains:
ANSWER:
      574 Amino AcidsNOTE:
By combining amino acids of 2 Alpha chains (141+141) and 2 Beta chains (146 + 146 A.A ) we totally have 574  Amino Acids.

* Keratin Is A Fibrous Protein.
*Haemoglobin is a Globulin Protein.  

--> Sequence Of Amino acids is determined by Order of Nucleotides in DNA. 
 MCQS:
 IN Sickle Cell haemoglobin of Human Being, amino acid from which Chain don't occupy it's Normal Position:ANSWER:
      Beta chain 

Note:
          This Disease May Lead To DEATH, Because haemoglobin fails to carry any or sufficient amount of Oxygen.Remember Me In Your Prayers

                                   ALLAH HAFIZ