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sample_midterm_1 - Midterm 1 BILD1 Fall 05 QUESTION 1 The...

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Midterm 1 BILD1 Fall 05 QUESTION 1 The peptide X-X-X-Serine-Glutamic Acid-Leucine-Histidine-Cysteine-X-X-X is a portion of the alpha chain of hemoglobin. A. (3pts)Write out the primary sequence of this peptide using the amino acid 3 letter codes. B. (2pts)What is the total charge of this peptide when in the cell? C. (3pts)Which (if any) amino acid in the sequence above contains a side chain that can make covalent bonds? D. (2pts)Circle the hydrogen bond donor(s) and underline the hydrogen bond acceptor(s) in the side chain of Serine below F. (8pts)Draw the peptide bond formed between Serine and Glutamic Acid. Point out the peptide bond by boxing it. If you were to design a second dipeptide, one that could maximally interact by Hydrogen-bonding and ionic interactions with the side chains of the dipeptide you’ve drawn, what kinds of amino acids would it contain? Explain why. G. (2pts)Name the functional group present in Cysteine’s side chain.
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Midterm 1 BILD1 Fall 05 H. (2pts)What is the first amino acid coded for in hemoglobin, and every other protein? Write the 3 letter code. I. (3pts)The first 3 DNA bases coding for any protein are Adenine-Thymine- Guanine. Circle the pyrimidine base(s) in this sequence.
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