arc5005

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Which of the following is LEAST likely to act as a buffer during the formation of urine in the nephron?

A. inorganic phosphate
B. bicarbonate
C. myoglobin
D. hemoglobin

Answer: D) hemoglobin

not sure i completely understand this free standing question from TBR. No reasoning provided.

Thank you in advance!
 

Ad2b

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I was thinking size; heme is like 4x as large as myo so for it to be there at all would very unusual.

If it showed up on an actual MCAT like that, I would pick D and be done with it based on the above...
 
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OP
A

arc5005

7+ Year Member
Oct 5, 2011
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426
Status
Medical Student (Accepted)
Thank you thank you!
 
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