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Unformatted text preview: Page 1 of 6 Name: BE.011/2772J Spring 2004 QUIZ I February 23, 2004 You have 1 hour for this exam. CLOSED BOOK 1 page notes allowed 1 (10points) 2 (5 points) 3 (25 points) 4 (60 points) total (100 points) k = 1.38 × 10-23 J/K Page 2 of 6 Name: 1.) ( 10 points) ELVIS is everywhere a.) Given 20 naturally occurring amino acids, what is the probability that the amino acid sequence ELVIS occurs in a stretch of a protein sequence? b.) What is the probability if the order of the amino acids did not matter, i.e., VLSEI, etc.? 2.) (5 points) Protein folding. a.) A protein is a linear chain of amino acids. The amino acid has two torsional angles than can vary around the α carbon, ψ and φ . Due to sterics, ψ and φ have 3 possible configurations apiece, yielding 3 × 3 = 9 possible configurations per amino acid. Pictured below is a three residue peptide: R H O R R H O R N H N N OH N H N N OH H O R H O H O R H O If a protein has n =100 amino acids, how many different configurations are possible? Page 3 of 6...
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This note was uploaded on 11/11/2011 for the course BIO 20.010j taught by Professor Lindagriffith during the Spring '06 term at MIT.
- Spring '06