Biochemistry Practice Quiz2

Biochemistry Practice Quiz2 - Biochemistry Practice Quiz2...

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Biochemistry Practice Quiz2 Dr. R.D. Allison 1. Which of the following compounds is consider a zwitterion (as drawn)? file:///W|/bch4024/examsandquizzes_summer2003.html (54 of 94) [5/7/2003 4:36:11 PM] file:///W|/bch4024/examsandquizzes_summer2003.html 2. Draw the titration curve of glycine, circling the portion (or portions) of the curve exhibiting the greatest buffering capacity. file:///W|/bch4024/examsandquizzes_summer2003.html (55 of 94) [5/7/2003 4:36:11 PM] file:///W|/bch4024/examsandquizzes_summer2003.html 3. Which of the following would NOT be an expected structural feature of a native proteins? a. a hydrogen bond between a threonine side-chain and a peptide bond carbonyl oxygen b. a salt-bridge (ion-pair) between the side-chains of arginine and glutamic acid. c. apolar interactions between the side-chains of tryptophan and isoleucine d. an alpha-helix segment oriented with all polar groups on the surface of the protein and all apolar residues towards the exterior of the protein e. a hydrogen bond in an alpha-helix between a proline-N-Hand backbone -C=O. 4. Which of the reagents below may be used to detect free sulfhydryl groups? a. lithium aluminum hydride (LiAlH4) b. ninhydrin c. 5,5'-dithiobis-(2-nitrobenzoic acid) file:///W|/bch4024/examsandquizzes_summer2003.html (56 of 94) [5/7/2003 4:36:11 PM] file:///W|/bch4024/examsandquizzes_summer2003.html d. 2,4-dinitrofluorobenzene e. none of the above. 5. Which of the following reagents can be used to detect the N-terminal amino acid of a polypeptide? a. Peformic acid b. cyanogen bromide c. 5,5'-dithiobis-(2-nitrobenzoic acid) d. 2,4-dinitrofluorobenzene e. none of the above 6. Which of the following cleaves a peptide bond in which the first amino acid residue is a methionine residue? a. trypsin
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b. chymotrypsin c. cyanogen bromide d. cysteic acid e. none of the above. 7. A protein is capable of binding the peptide phenylalanylglutamine. It would be reasonable to speculate that the binding site on the protein might contain: a. an aspartic acid side-chain to form a salt-bridge (ion-part) with the glutamine amino group of the dipeptide b. a threonine which hydrogen bonds with the phenylalanine side chain of the dipeptide c. a valine side-chain that hydrogen bonds with the glutamine side-chain of the dipeptide d. a tryptophan residue that participates in apolar interactions with the phenylalanine side-chain of the dipeptide e. an arginyl side-chain that has pi-pi interactions with the phenylalanine side-chain of the dipeptide 8. Which of the following would be most alike in an alpha-helix and a collagen helix? (Note: This is one of those questions which may not be covered in lectures). a. phi, psi angles b. intra-chain hydrogen bonds c. peptide bond configuration d. high proline content e. absorption spectrum in the ultraviolet region of the spectrum A) disulfide bonds file:///W|/bch4024/examsandquizzes_summer2003.html (57 of 94) [5/7/2003 4:36:11 PM] file:///W|/bch4024/examsandquizzes_summer2003.html
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This note was uploaded on 04/22/2010 for the course BCH 4023 taught by Professor Allen during the Spring '10 term at University of Florida.

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Biochemistry Practice Quiz2 - Biochemistry Practice Quiz2...

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