BIOLOGY
PROTEINS
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
A the iron content
|
|
|
B the primary structure
|
|
|
C the quaternary structure
|
|
|
D the secondary structure
|
Detailed explanation-1: -The specific base sequence for these amino acids is: GTG/CAC/CTG/ACT/CCT/GAG. Sickle cell hemoglobin (Hemoglobin S) results when, glutamic acid that is normally present in the sixth position on the beta globin chain is substituted with valine.
Detailed explanation-2: -A hemoglobin molecule is made up of four polypeptide chains, two alpha chains of 141 amino acid residues each and two beta chains of 146 amino acid residues each.
Detailed explanation-3: -Hemoglobin is an example of a globular protein. It consists of four polypeptide chains, each folded onto itself. Each chain is attached to a heme group–a ring-like structure with an iron atom at the center. It is at these iron atoms that oxygen molecules bind to hemoglobin.
Detailed explanation-4: -The hemoglobin molecule is made up of four polypeptide chains (Alpha 1, Beta 1, Alpha 2, Beta 2), noncovalently bound to each other. There are four heme-iron complexes. Each chain holds a heme group containing one Fe++ atom. The heme-iron complexes are colored red because they give hemoglobin its red color.