Biochemistry ACS Final: Part One Exam Questions and Answers 100% PASS

Biochemistry ACS Final: Part
One Exam Questions and
Answers 100% PASS

AMINO ACIDS, POLYPEPTIDES, PROTEIN:


General Info, Structure—ANSWER-poop


General structure of an AA?—ANSWER-COO-


l


H3N+ -- C -- H


l


R


Name the non-polar, aliphatic AAs (7 of them)


and general characteristics—ANSWER-Glycine, Alanine, Proline, Valine,

Leucine, Isoleucine, Methionine


(GAP VLIM)


-hydrophobic due to neutral charges


-tend to cluster together within proteins and help stabilize by means of

hydrophobic interactions

, Name the aromatic AAs


and general characteristics—ANSWER-Phenylalanine, Tyrosine, Tryptophan


-relatively nonpolar (hydrophobic)


-Tyr and Trp are significantly more polar than Phe


Name the polar, uncharged AAs (5)


and general characteristics—ANSWER-Glutamine, Cysteine, Asparagine,

Threonine, Serine


(G-CATS)


-more soluble in water (aka more hydrophillic) than non-polar, b/c they can

form H-bonds with water


-in thr and ser, due to the OH groups


-in cys due to its SH group which acts like OH


-in asn, and gln due to their amide groups


Name the positively charged AAs


and general characteristics—ANSWER-Lysine, Histidine, Arginine


-most hydrophillic, along with negatively charged AAs


-His may be positively charged (protonated form) or uncharged at pH 7.0


Name the negatively charged AAs


and general characteristics—ANSWER-Glutamate, Aspartate


-very hydrophillic

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