#2 In lass review Chapter 2 1- In an alpha helix, the amino acid side chains: Ex
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#2 In lass review Chapter 2 1- In an alpha helix, the amino acid side chains: Extend outward from the center of the helix b. Extend toward the center of the helix c. Hydrogen bond to one another to stabilize the secondary structure d. Must be small e. Must be hydrophobic , a. 2- If the following peptide were part of an alpha helix, where would you expect this peptide to be located relative to the rest of the protein? Phe, Leu, ser, Asp, Val, lle, Arg, Glu a. Inside the protein b. Extended outward from the protein, surrounded by water c. Inside the membrane d. On the surface of the protein 3- There can be no more than 3 peptides associated with a single beta sheet a. T b. F 4- The most rigid keratin structure is formed by: a. alpha helical proteins with hydrophobic side chains b. alpha helical proteins with charged side chains c. alpha helical proteins with cysteine d. Beta sheets with hydrophobic amino acids e. Beta sheets with proline 5- The center portion of the alpha helix is: a. Open for water to permeate b. Filled with the nitrogen atoms of the peptide bond c. Positively charged d. Negatively charged e. Filled with the hydrogen atoms attached to the alpha carbon. 6- If each of these peptides were part of a beta sheet, which would you expect to be most likely to be located on the surface of the protein? a. Phe, Leu, lle, Val b. Phe, Ser Ile, Val c. Ser, Leu, lle, Arg d. Phe, Ser, Ile, Arg 7- If the pkA of the an amine group is 10, what proportion of the molecules will be charged at pH7.0? a. 1 charged for every 1000 uncharged b. 1 charged for every 100 unchargedExplanation / Answer
1. Answer is option C. Other options are wrong because it is long. It can be hydrophobic or hydrophilic.
2. Answer is option A. It can be found inside the protein.
3. Answer is false. There can be 3-10 amino acids in a single beta sheet.
4. The most rigid keratin structure is formed by alpha helical proteins with cysteine.
5. The center portion of alpha helix is positively charged.
6. Answer is option C. It is so because serine is hydrophobic and polar amino acid.
7. Answer is option B. 1 charged for every 100 uncharged.
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