Exam_1_with_key - CODE - ACHHGH- BMB461, Spring 2006 -...

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Unformatted text preview: CODE - ACHHGH- BMB461, Spring 2006 - Biochemistry I 1 BMB461 Exam I 2006 02 15 Name: 1 pt A solution is prepared with a concentration [H + ] of 1 pM. The pH equals: 1 . A 9 B 11 C 2 D 6 E 12 1) E false false false false true 2 4 6 8 10 12 14 0.5 1 1.5 2 2.5 pH OH Equivalents The titration of an unknown diprotic acid is shown. 1 pt Estimate the lower pKa: 2 . A 5 B 4 C 6 D 7 E 2 F G 1 H 3 CODE - ACHHGH- BMB461, Spring 2006 - Biochemistry I 2 BMB461 Exam I 2006 02 15 1 pt Estimate the higher pKa: 3 . A 13 B 7 C 11 D 12 E 9 F 8 G 10 H 14 2) C false false true false false false false false 3) D false false false true false false false false 1 pt Phosphoric acid is a polyprotic acid with three dissociable protons. The pK a values of phosphoric acid are: pK 1 = 2.15 pK 2 = 7.2 pK 3 = 12.4. What is the pH of a dilute aqueous solution in which the species shown below predominates? 4 . A This molecule would predominate in a solution with a pH < 2.15 B This molecule would predominate in a solution with a pH > 12.4. C This molecule would predominate in a solution with a pH between 2.15 and 7.2. D This molecule would predominate in a solution with a pH between 7.2 and 12.4. 4) D false false false true 1 pt A generic amino acid is depicted here, with the H atom hidden behind the C atom. What is the chirality? 5 . A L enantiomer B D enantiomer 5) A true false CODE - ACHHGH- BMB461, Spring 2006 - Biochemistry I 3 BMB461 Exam I 2006 02 15 1 pt Identify lysine among the following four chemical diagrams: 6 . A B C D CODE - ACHHGH- BMB461, Spring 2006 - Biochemistry I 4 BMB461 Exam I 2006 02 15 1 pt Which amino acid is achiral? 7 . A Asparagine B Cystine C Methionine D Glycine E Aspartate 7) D false false false true false 1 pt Which amino acid has a chiral carbon in its side chain ? 8 . A Glutamic acid B Threonine C Methionine D Asparagine E Cystine 8) B false true false false false 1 pt Which amino acid is most similar to tyrosine? 9 . A Proline B Alanine C Leucine D Phenylalanine E Valine 9) D false false false true false 1 pt Which amino-acid side chain absorbs significantly at 280 nm? 10 . A Histidine B Tryptophan C Asparagine D Glutamate E Serine 10) B false true false false false 1 pt Which amino acid is most likely to bind to hard metal ions like Ca 2+ ? 11 . A Arginine B Lysine C Tyrosine D Methionine E Aspartate 11) E false false false false true CODE - ACHHGH- BMB461, Spring 2006 - Biochemistry I 5 BMB461 Exam I 2006 02 15 1 pt Which amino acid is most likely to bind to soft metal ions like Cu 2+ and Ni(II)? 12 . A Histidine B Aspartate C Tyrosine D Arginine E Glutamate 12) A true false false false false 1 pt How many grams of lysine must be added to 10 mL of pure water to obtain a 1 M solution?...
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This note was uploaded on 03/19/2008 for the course ANS 313 taught by Professor Vandehaar during the Fall '07 term at Michigan State University.

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Exam_1_with_key - CODE - ACHHGH- BMB461, Spring 2006 -...

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