pH and buffers help!
I'm a med student and finding the following two questions a little tricky, any help would be much appreciated 
1) Write down your prediction of the structure of the predominant ionic species of the dipeptide aspartyl cysteine at each of the following pH values : 1,5,7,9,11 2) What causes the pKa for the side chain of histidine residues in a protein to differ from the value of the simple amino acid (referring to haemoglobin)
1) Write down your prediction of the structure of the predominant ionic species of the dipeptide aspartyl cysteine at each of the following pH values : 1,5,7,9,11 2) What causes the pKa for the side chain of histidine residues in a protein to differ from the value of the simple amino acid (referring to haemoglobin)
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