A) amine B) aldehyde C) amide D) ester 4- The amino acids serine and threonine c

Question

A) amine B) aldehyde C) amide D) ester 4- The amino acids serine and threonine contain which functional group on the side chain? B) amide C) hydroxylD) thiol E) amine A) carboxylic acid 5-8 Match the amino acid with the group based on the variable side chain (each option can only be used once). A) negative charge 5 -tryptophan B) aromatic 6- histidine C) positive charge 7 - isoleucine D) hydrophobic 8- aspartate 9- Which of the following pairs of amino acids are NOT in the same group based on side chain properties? A) tyrosine and phenylalanine B) histidine and tryptophan C) serine and threonine D) alanine and glycine E) valine and leucine 10-The chirality of an amino acid is due to A) the presence of a carbon with 4 single bonds. the presence of a symmetric carbon. B) C) variability in the side chain. D) two hydrogen atoms attached to the alpha carbon. 11 - Which of the following side chains would NOT allow for a chiral center? A) Methyl B) Hydrogen C) Phenyl D) Indole E)Guanidino 12 - Which of the following functional groups in can be protonated to give a positive charge? A) Amino B) Carboxylic acid C) amide D) indole E) Phenyl 13-which of the functional groups bonded to the carbon is never ionized? A) Amino group B) Carboxylic acid group C) Hydrogen atom D) Variable side chain 14 -The amino acid arginine has a guanidine functional group within the side chain. How many functional groups in this amino acid can be ionized? A) 0 B)1 C)2 D)3 E) 4

Explanation / Answer

4. C. Hydroxyl group (OH)

5. Tryptophan: B. Aromatic

6. Histidine: C.positive charge

7. Isoleucine: D. Hydrophobic

8. Aspartate: A. Negative charge

9. A. Tyrosine and phenylalanine : phenylalanine has non polar side chain and tyrosine has polar side chain.

10. A. Presence of carbon atom with 4 single bonds

11. B. Hydrogen

12. A. Amino group

13. C. Hydrogen atom

14. D. 3

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