BCH 361 CH 2 Questions Study Questions
with 100% Correct Verified Solutions| Latest
Update
In an unshaken oil and vinegar salad dressing:
a) the oil and vinegar separate into two distinct layers.
b) the oil will form an emulsion within the vinegar.
c) the polar and nonpolar molecules interact.
d) the oil and vinegar will mix because both are nonpolar. - Answer a
You are studying an enzyme isolated from lysosomes. It is most active at a pH of 5. Which of the
following buffers would be the BEST choice to use in an enzyme activity assay for this enzyme?
a) a phosphate buffer system
b) an acetate buffer system
c) an ammonia buffer system
d) a combination buffer of hydrochloric acid and sodium hydroxide
e) a hydrochloric acid buffer system - Answer b
Under appropriate conditions, protein folding proceeds:
a) amphipathically.
b) due to the hydrophobic effect.
, c) spontaneously.
d) both amphipathically and due to the hydrophobic effect.
e) both spontaneously and due to the hydrophobic effect - Answer e
You have a mixture of proteins with the following pKa's. Which of the statements below is TRUE?
Protein X pKa = 2
Protein Y pKa = 6
Protein Z pKa = 10
a) At a pH of 6, protein Y will be 50% protonated and 50% deprotonated.
b) At a pH of 8, protein Y will be more protonated than protein Z.
c) At a pH of 6, the solution of protein X will contain more hydrogen ions than the solution of protein Z. -
Answer a
Nonpolar solute molecules are driven together in water not primarily because they have a high affinity
for each other, but because, when they do associate, they release water molecules. This association is
called the _____. - Answer Hydrophobic Effect
Which of the following has the lowest Ka?
a) bicarbonate
b) carbonic acid
c) dihydrogen phosphate
d) phosphoric acid
e) acetic acid - Answer a
Which of the following is dependent on Brownian motion?
a) signal molecules diffusing from site of origin to site of effect
with 100% Correct Verified Solutions| Latest
Update
In an unshaken oil and vinegar salad dressing:
a) the oil and vinegar separate into two distinct layers.
b) the oil will form an emulsion within the vinegar.
c) the polar and nonpolar molecules interact.
d) the oil and vinegar will mix because both are nonpolar. - Answer a
You are studying an enzyme isolated from lysosomes. It is most active at a pH of 5. Which of the
following buffers would be the BEST choice to use in an enzyme activity assay for this enzyme?
a) a phosphate buffer system
b) an acetate buffer system
c) an ammonia buffer system
d) a combination buffer of hydrochloric acid and sodium hydroxide
e) a hydrochloric acid buffer system - Answer b
Under appropriate conditions, protein folding proceeds:
a) amphipathically.
b) due to the hydrophobic effect.
, c) spontaneously.
d) both amphipathically and due to the hydrophobic effect.
e) both spontaneously and due to the hydrophobic effect - Answer e
You have a mixture of proteins with the following pKa's. Which of the statements below is TRUE?
Protein X pKa = 2
Protein Y pKa = 6
Protein Z pKa = 10
a) At a pH of 6, protein Y will be 50% protonated and 50% deprotonated.
b) At a pH of 8, protein Y will be more protonated than protein Z.
c) At a pH of 6, the solution of protein X will contain more hydrogen ions than the solution of protein Z. -
Answer a
Nonpolar solute molecules are driven together in water not primarily because they have a high affinity
for each other, but because, when they do associate, they release water molecules. This association is
called the _____. - Answer Hydrophobic Effect
Which of the following has the lowest Ka?
a) bicarbonate
b) carbonic acid
c) dihydrogen phosphate
d) phosphoric acid
e) acetic acid - Answer a
Which of the following is dependent on Brownian motion?
a) signal molecules diffusing from site of origin to site of effect
