BCH 361 CH 2 Questions Study Questions with 100% Correct Verified Solutions| Latest Update
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Module
BCH 361
Institution
BCH 361
A solution of a weak acid contains 5 mM of the conjugate acid (HA), 2.5 mM of the conjugate base (A—),
and 2.5 mM of H+. What is the Ka for this ionization?
a) 5 mM
b) 2.5 mM
c) 1.25 mM
d) 0.5 mM
e) None of the above - Answer c
BCH 361 CH 2 Questions Study Questions with
100% Correct Verified Solutions| Latest Update
A solution of a weak acid contains 5 mM of the conjugate acid (HA), 2.5 mM of the conjugate base (A—),
and 2.5 mM of H+. What is the Ka for this ionization?
a) 5 mM
b) 2.5 mM
c) 1.25 mM
d) 0.5 mM
e) None of the above - Answer c
Ka = (H+)(A-)/(HA)
Which of the following is NOT an example of a noncovalent interaction?
a) a van der Waals interaction
b) a hydrogen bond
c) a salt tunnel
d) an ionic interaction
e) an electrostatic interaction - Answer c
Which of the following statements about hydrophobic interactions is CORRECT?
a) Hydrophobic interactions occur between water molecules.
b) Hydrophobic interactions do not follow the Second Law of Thermodynamics.
c) Hydrophobic interactions are important in the generation of order in biological organisms.
d) During hydrophobic interactions, enthalpy remains constant. - Answer c
, The active site of an enzyme contains a critical cysteine residue. The enzyme is active only when the
cysteine side chain is in its protonated form. The pKa for the R-group of cysteine is 8.18. What
percentage of the enzyme is active when in a buffer at pH 7.18?
a) 50%
b) 10%
c) 0%
d) 99.9%
e) 90.9% - Answer e
Which of the following statements regarding van der Waals interactions is NOT correct?
a) Van der Waals interactions occur between nonpolar molecules.
b) Van der Waals interactions are stronger at distances closer than the contact distance.
c) The contact distance for a typical van der Waals interaction is about 3 to 4 angstroms.
d) While a single van der Waals interaction is weak, many together can result in large forces between
molecules and yield interesting biological results. - Answer b
Benzene is an example of _____ molecule.
a) a polar
b) a nonpolar
c) a hydrophobic
d) an entropic
e) both a nonpolar and a hydrophobic - Answer e
Which of the following statements is CORRECT?
a) The conjugate acid of acetic acid is acetate.
b) The conjugate base of acetic acid is acetate.
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