Print Calculator Periodic Table Question 13 at 20 Map All amino acids have two i

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Print Calculator Periodic Table Question 13 at 20 Map All amino acids have two ionizable functional groups: an·amino group (average pK, of 9.4) and an a-carboxylic acid group (average pk of 2.2). Tyrosine also has an ionizable side chain (R group) with a pke of-10.1. One of the possible ionization states of tyrosine is shown below 0 CH2 OH At what pH would the structure above be the predominant ionization state? Note: Consider the ionization state of all three of the functional groups pH- select answer Scroll down for more of this question. 100 The protonated form of the R group of tyrosine is shown in the structure above. The ratio of the protonated form to the charged (deprotonated) form depends on the pk, of the R group and the pH of the solution. Select the pH value at which the charged form of the R group would predominate. 100 O Previous Give Up & View Solution D Check Answer 0 Next Exit

Explanation / Answer

Pka of side chain in tyrosine is 10.5.

when PH > 10.5 then side chain have (-)ve charge.

here we have 12.4 in your options, which is greater than 10.5.

so answer is PH = 12.4.

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