NEED HELP WITH THIS QUESTION. Imagine a 250 mM solution of glycine in water at p

Question

NEED HELP WITH THIS QUESTION.

Imagine a 250 mM solution of glycine in water at pH 3.3; of the glycine molecules in this solution, the large majority is zwitterionic, a small number is neutral very close to 100% are zwitterionic a small number is zwitterionic, the majority is neutral a small number is zwitterionic, the majority is cationic the large majority is zwitterionic, a small number is cationic very close to 0% are zwitterioinic, 100% are neutral very close to 0% are zwitterionic, 100% are cationic exactly 50% are zwitterionic, 50% are neutral exactly 50% are zwitterionic, 50% are cationic

Explanation / Answer

Isoelectric point, pI, is the pH at which the amino acid is neutral, i.e. the zwitterion form is dominant. The pI value of glycine is 5.97. The given pH is below the pI value. So, a small number of glycine is in zwitterionic form, and a small number is cationic form.

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