Quiz_biochemifall2017quiz1.pdf - Biochem I Fall 2017 Quiz 1...

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Quiz_biochemifall2017quiz1.pdf

1 .   The Cation - Pi interaction that stabilizes contacts between the side chains of positively charged amino acids and aromatic amino acids is an example of :
A van der Waals interaction
B Covalent interaction
C Hydrogen bonding interaction
D Induced ipole interaction
E Ionic bond interaction
Answer:  D   Induced ipole interaction
2 .   Which of the following is the correct ranking , in decreasing order ( strongest to weakest ranked from left to right ) , of the strengths of the interactions : ( Ignore the effect of dielectric constant of the solvent )
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3 .   The high dielectric constant of water increases the electrostatic force of attraction between two oppositely charged ions in an aqueous soultion .
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4 .   Animal Cells share all of the following with Plant Cells except :
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5 .   Peptide bonds connecting amino acids in a protein are chemically amide groups in nature . Therefore , the hybridization state of Carbon in a peptide bond is :
A sp
B sp2
C sp3
D Can be all of the above
Answer:  B.   sp2
6 .   Stacking interactions between nitrogenous bases located next to each other in the same strand of a DNA molecule are a form of :
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7 .   All Archaea are Prokaryotes but all Prokaryotes are not Archaea .
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8 .   Each individual hydrogen bond between two water molecules is :
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9 .   According to Coulomb 's law of electrostatic attraction , the force between two oppositely charged ions :
A Is directly proportional to the distance between the centers of the two charged ions
B Is directly proportional to the square of the distance between the centers of the two charged ions
C Is inversely proportional to the distance between the centers of the two charged ions
D Is inversely proportional to the square of the distance between the centers of the two charged ions
E Is constant and independent of the distance between the centers of the two charged ions
Answer:  D   Is inversely proportional to the square of the distance between the centers of the two charged ions
10 .   The major force stabilizing an alpha helical secondary structure of a polypeptide is :
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Biochem I Fall 2017 Quiz 1 Score: 1. The Cation-Pi interaction that stabilizes contacts between the side chains of positively charged amino acids and aromatic amino acids is an example of: A van der Waals interaction Covalent interaction Hydrogen bonding interaction Induced Dipole interaction Ionic bond interaction B C D E
2. Which of the following is the correct ranking, in decreasing order (strongest to weakest ranked from left to right), of the strengths of the interactions: (Ignore the effect of dielectric constant of the solvent) B C D E

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