QUESTION 10 This diagram represents a short peptide. The R side chains are inten

Question

QUESTION 10 This diagram represents a short peptide. The R side chains are intentionally represented in their non-ionized forms. However, as you answer the questions, you should think about how the amino acids in this peptide will behave when they are in water NH-CH-C-NH- CHy CH 2HOo NH Number the amino acids from the amino terminus (N terminus) to the carboxy terminus (C terminus). This original worksheet is it's easier for you to think about by writing on the paper. Which of the following it,a polar (but uncharged) amino acid? posted on blackboard if A. #4 (.. C, #2 D. #1

Explanation / Answer

The correct answer is (D.) #1

The amino acid repsented by #1 has a alcohol group (-OH) present on the side chain.

This makes the amino acid polar because the bond between oxygen and hydrogen is polar due to high electronegativity of oxygen atom.

Also the two lone pair of electrons present on oxygen atom attracts other hydrogen atoms which are attached to oxygen giving rise to hydrogen bonding intermolecular force which is present in polar molecules

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