Homework1answers_001

Homework1answers_001 - BIBC 100 Homework #1 Jan 18, 2008 1....

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BIBC 100 Homework #1 Jan 18, 2008 1. Plot the following 10-residue peptide as an alpha-helix on the helical wheel. Make sure to mark the details such as N-terminus, C-terminus, the distance/angle between each residue, hydrophobic region/polar region. N-Terminus –M-T-R-A-A-S-L-I-Q-S – C-Terminus 2. Name two amino acids that are often found in the turns/loops of protein structures, and explain why. Proline because of its unusual side chain; the side chain distorts the main chain, introducing a bend or kink. Glycine because of its very small side chain; the single hydrogen atom side chain allows glycine to take part in many conformations that are sterically forbidden for other amino acids.
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3. Fill in the blanks or circle the right answer. Cysteine residues often form disulfide bonds in an _ oxidized _ (oxidized / reduced) state; the bonds do not form in an reduced _ (oxidized / reduced) state. Because the extracellular environment is a ( oxidizing / reducing ) environment, many cysteines are
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Homework1answers_001 - BIBC 100 Homework #1 Jan 18, 2008 1....

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