Midterm2_2008%20Answer%20Key

Midterm2_2008 Answ - Name_ANSWER KEY Biochemistry Chem 142A/242A Midterm 2 on Chapters 5 7 and 8 Problem 1 2 3 4 5 6 7 8 Total Extra credit

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1 Name___________ ANSWER KEY ____________________ Biochemistry Chem 142A/242A Midterm 2 on Chapters 5, 7 and 8 November 17, 2008 Problem Points/Possible 1 /40 2 /6 3 /6 4 /6 5 /6 6 /6 7 /24 8 /6 Total /100 Extra credit 3
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2 1. (40 points). Circle the correct answer for each question. (a). An allosteric interaction is one in which: A) binding of the ligand to the protein is covalent. B) binding of a molecule to a binding site affects binding of additional molecules to the same type of site. C) binding of a molecule to a binding site affects binding properties of a different type site on the protein. D) multiple molecules of the same ligand can bind to the same binding site. E) two different ligands can bind to the same binding site. (b). Myoglobin and the subunits of hemoglobin have: A) no obvious structural relationship. B) very different primary and tertiary structures. C) very similar primary and tertiary structures. D) very similar primary structures, but different tertiary structures. E) very similar tertiary structures, but different primary structures. (c). An individual molecular structure within an antigen to which an antibody binds is a(n): A) antigen. B) fragment. C) Fab region. D) Fc region E) epitope. (d). The biochemical property of lectins that is the basis for most of their biological effects is their ability to bind to: A) amphipathic molecules. B) hydrophobic molecules. C) specific lipids. D) specific oligosaccharides. E) specific peptides. (e). For the oligoribonucleotide pACGUAC: A) the nucleotide at the 3 ' end has a phosphate at its 3 ' hydroxyl. B) the nucleotide at the 3 ' end is a purine. C) the nucleotide at the 5 ' end has a 5 ' hydroxyl. D) the nucleotide at the 5 ' end has a phosphate on its 5 ' hydroxyl. E) the nucleotide at the 5 ' end is a pyrimidine. (f). From the abbreviated name of the compound Gal( β 1 4)Glc, we know that: A) C-4 of glucose is joined to C-1 of galactose by a glycosidic bond. B) the compound is a D-enantiomer. C) the galactose residue is at the reducing end. D) the glucose is in its pyranose form.
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This note was uploaded on 11/14/2010 for the course CHEM 142a taught by Professor Parsons,s during the Spring '08 term at UCSB.

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Midterm2_2008 Answ - Name_ANSWER KEY Biochemistry Chem 142A/242A Midterm 2 on Chapters 5 7 and 8 Problem 1 2 3 4 5 6 7 8 Total Extra credit

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