10.20 (1)

10.20 (1) - is wrong because amino acids are different from...

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Key: 20. Which of the following are characteristics of an amino acid? a. An amino acid molecule is held together with peptide bonds b. Amino acids are an example of a trans-fatty acid c. Amino acids are the building blocks of proteins d. Amino acids form zwitterions in solutions e. Amino acids are ionic compounds f. Two of the above To answer this problem, you simply need to know the characteristics of an amino acid. Here is its structure where R represents different functional groups. Let’s look at the choices one by one Choice a is wrong because an amino acid is held together by regular covalent bonds, not peptide bonds. On the other hand, a group of amino acids is bonded to one another by peptide bonds. Choice b
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Unformatted text preview: is wrong because amino acids are different from trans-fatty acids or any fatty acids for that matter. Fatty acids have this general structure: Choice c is correct because amino acids are the functional units of proteins. Choice d is correct because zwitterions are molecules that have both positive negative functional groups. On the right is glycine dissolved in water. Choice e is wrong because most amino acids are like the molecule above to the left with no charge. If one is placed in solution at varying pHs you can turn it into an ion, but that doesn’t make it an ionic compound, which must consists of cations and separate anions (both). Since two answers are correct, the best answer is f...
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This document was uploaded on 11/04/2011 for the course CHEM 106 at BYU.

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10.20 (1) - is wrong because amino acids are different from...

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