A drop in pH would make protonation more likely, and a protonated proximal histidine would not be able to donate its electron density to the iron atom.
<h3>
What is the role of proximal histidine in hemoglobin?</h3>
The first histidine that is bonded to Fe(2+) we call proximal, and the histidine that bonds last, to the oxygen, we call distal.
Histidine is an amino acid most people get from food. It's used in growth, repair of damaged tissues, and making blood cells.
It helps protect nerve cells. It's used by the body to make histamine.
In hemoglobin, the role of proximal histidine is to hold the heme group in the correct location on the hemoglobin chain.
The proximal histidine also pulls the iron in heme out of the plane of the heme molecule. This iron will be pulled back into the plane when it is oxygenated.
The proximal histidine strengthens the iron-imidazole bond and helps to stabilize the oxidoreductase in its higher oxidation (i.e. compounds I and II) states.
To learn more about histidine, refer
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Answer: Letter to Mr Landers
Explanation:
Writing the letter on an existing address
Dear Mr Landers,
I am writing this letter to you to inform you of my plans to stay. After extensive consideration of my options through long nights and lengthy days, I was faced with divers things running through my mind which would be the outcome of my decision, as I considered closely, I had to choose carefully ensuring I don't haste over the options and I'm calm with my selection, after much consideration, I choose to stay.
Answer: C
Explanation:
more numerous than cones are in the fovea
I believe the answer is c) situational variables
