The PK₁,pK₂,and PK_R for the Amino Acid Arginine Are 1 $\alpha$

question 32

Multiple Choice

The pK₁,pK₂,and pK_R for the amino acid arginine are 1.8,9.0,and 12.5,respectively.At pH 7.0 arginine would be charged predominantly as follows:

• A)"\(\alpha\)-carboxylate 0,\(\alpha\)-amino 0,guanidino +1,net charge +1"
• B)"\(\alpha\)-carboxylate +1,\(\alpha\)-amino 0,guanidino -1,net charge 0"
• C)"\(\alpha\)-carboxylate +1,\(\alpha\)-amino −1,guanidino −1,net charge −1"
• D)"\(\alpha\)-carboxylate −1,\(\alpha\)-amino +1,guanidino +1,net charge +1"
• E)"\(\alpha\)-carboxylate −1,\(\alpha\)-amino 0,guanidino +1,net charge 0"

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