Amino Acids, Proteins and Enzymes-multiple choice -Which of these atoms is not f

Question

Amino Acids, Proteins and Enzymes-multiple choice -Which of these atoms is not found in an amino acid backbone? A) Carbon 1 B) Hydrogen C) Nitrogen D) Sulfur 2Which of the following functional groups or atoms is not directly attached to the alpha carbon of an amino acid? A) Carboxylic acid B) Hydrogen C) Nitrogen D) Amine E) Thiol -Which functional group can be found on the amino acid backbone and also on a variable side chain of a single amino acid? A) amine B) aldehyde C) amide 3 D) ester E) hydroxyl 4-The amino acids serine and threonine contain which functional group on the side chain? A) carboxylic acid B) amide C) hydroxyl D) thiol E) amine 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? tyrosine and phenylalanine histidine and tryptophan serine and threonine alanine and glycine valine and leucine A) B) C) D) E) 10- The chirality of an amino acid is due to: A) B) the presence of a carbon with 4 single bonds. the presence of a symmetric carbon

Explanation / Answer

(1)D.sulfur

(2)E.thiol

(3)A.amine

(4)C.hydroxyl

(5)tryptophan-aromatic

(6)histidine-positive

(7)isoleucine-hydrophobic

(8)Aspartate-negative charge

(9)B.histidine and tryptophan

Histidine is has imidazole side chain and is positively charged polar amino acid while tryptophan is a non polar aromatic amino acid

(10)The chirality of an amino acid results from the fact that its carbon: is bonded to four different chemical groups.

(11) B.hydrogen

(12)A. Amino

(13)c.hydrogen

(14)c.3

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