Q@Q Drill time III. - cardio69

[ArchivalUser]

Which one of the following statements concerning the Hb’s is correct?


a) Fetal blood has a higher affinity for O2 than does adult blood because Hb fetal has a ↑ affinity for 2,3-BPG
b) Purified Hb has a higher affinity for O2 than does purified Hb A
c) The globin chain composition of Hb Fetal is α2δ2
d) Gamma chains of Hb of fetal, His/H21 is replaced by an uncharged serine residue
e) Hb A1c differs from Hb A by a single, genetically determined AA substitution
f) Hb A2 appears early in fetal life
g) Gamma chains of fetal, His/21 is replaced by charged serine residue

__________________________________72sec from the time Q posted_________________________

[ArchivalUser]

Time's UP>

[ArchivalUser]

D or G
D not sure though
thanks cardio

[ArchivalUser]

We have only ONE ans on my Q

*D* would be correct ANS.

[ArchivalUser]

thanks

[ArchivalUser]

i have a doubt about this.... in DIT they have said gamma chains Histidine are replaced by positively charged serine residue....so less affinity to 2,3 BPG and more affinity to O2


please clarify.....?

[ArchivalUser]

@dctrclvr DIT has plenty of error.
Can you tell me, where you think BPG create salt bonds in HbA?
You got 72sec to ans it...