MIDTERM 1

MIDTERM 1 - Answers to Study Guide for Midterm 1/ BIBC 100...

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Answers to Study Guide for Midterm 1/ BIBC 100 / Structural Biochemistry 1. Create a sequence of peptides containing 10 amino acids. Chose any of the 20 amino acid types in any combination. You can choose an amino acid type more than once. Use single letter codes/three letter codes (you should make 6 peptides). - hydrophobic example VAFLIMYAGW - hydrophilic example STNSQQTTNS (can use charged goups, too) - positively charged like hydrophilic plus use K R (H) - negatively charge like hydrophilic plus use D E - with charged residues, but neutral net charge must be zero (requires a pos charged residue for each neg charged residue). 2. What molecular properties increase the solubility of polar molecules in water? dipole moments, charges Which type of interaction is mostly involved in the presence of chemical groups containing oxygen, nitrogen, but not carbon atoms? hydrogen bonds What is the importance of hydrogen bonds in protein secondary structures? hydrogen bonds restrict torsion angel rotation Which amino acid residues should you avoid when designing a water soluble peptide? Hydrophobic amino acids How many amino acids do you need in a peptide to span a distance of 30 Angstroms in alpha helical conformation? at least 20 amino acids; Calculation: there are 3.6 residues per turn,
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MIDTERM 1 - Answers to Study Guide for Midterm 1/ BIBC 100...

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