Biochem 1) An alpha helix: a.) is stabilized by the amino acid proline b.) can o
ID: 48763 • Letter: B
Question
Biochem
1) An alpha helix:
a.) is stabilized by the amino acid proline
b.) can only form by hydrogen bonding between different polypeptide chains
c.) can only form when cysteines form disulfide bridges within this structure
d.) can be destabilized by steric repulsion by large bulky side chains e.) none of the above
2) What will likely happen if histidine and glutamate at pH 4 are near each other in a polypeptide chain?
a.) The side chains of these amino acids will be uncharged and there will be no effect.
b.) The side chains of these amino acids will be charged and they will attract each other.
c.) The side chains of these amino acids will be charged and they will repel each other.
d.) Not enough information is given to determine the effect.
3 )Consider the amino acid Isoleucine. Which of the following best describes where you predict this
amino acid would be found?
a.) This amino acid is hydrophobic and would be on the surface of a protein that is in the middle
of a membrane.
b.) This amino acid is hydrophilic and would be on the surface of a protein that is in the middle
of a membrane.
c.) This amino acid is hydrophobic and would be in the interior of a protein that is in the middle
of a membrane.
d.) This amino acid is hydrophilic and would be in the interior of a protein that is in the middle of
a membrane.
e.) Not enough information is given to determine
Explanation / Answer
1)d.) can be destabilized by steric repulsion by large bulky side chains
2)b.) The side chains of these amino acids will be charged and they will attract each other
3) C) This aminoacid is hydrophobic and would be in the interior of a protein that is in the middle of a membrane
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