AAMC FL2 Exam Questions Correct
Solutions New Update
What is the total number of sp2-hybridized carbon atoms present in the fluorophore
used in the experiments? - Answers -✔✔ 9
The concentration of enzyme for each experiment was 5.0 μM. What is kcat for the
reaction at pH 4.5 with NO chloride added when Compound 3 is the substrate?
Passage: rate of product formation did not vary over time for the first 5 minutes -
Answers -✔✔ The fact that the rate of product formation did not vary over time for the
first 5 minutes implies that the enzyme was saturated with substrate. Under these
conditions, kcat = Vmax/[E]
= (125 nM/s)/5.0 μM = 2.5 × 10-2 s-1.
Absorption of ultraviolet light by organic molecules always results in what process? -
Answers -✔✔ Excitation of bound electrons
Bond breaking can subsequently result, as can ionization or bond vibration, but none of
these processes are guaranteed to result from the absorption of ultraviolet light.
Four organic compounds: 2-butanone, n-pentane, propanoic acid, and n-butanol,
present as a mixture, are separated by column chromatography using silica gel with
benzene as the eluent. What is the expected order of elution of these four organic
compounds from first to last? - Answers -✔✔ n-Pentane → 2-butanone → n-butanol →
propanoic acid
The four compounds have comparable molecular weights, so the order of elution will
depend on the polarity of the molecule. Since silica gel serves as the stationary phase
for the experiment, increasing the polarity of the eluting molecule will increase its affinity
for the stationary phase and increase the elution time (decreased Rf).
Why must the person either lean forward or slide their feet under the chair in order to
stand up? - Answers -✔✔ To keep the body in equilibrium while rising
Based on the relative energy of the absorbed electromagnetic radiation, which
absorber, a peptide bond or an aromatic side chain, exhibits an electronic excited state
that is closer in energy to the ground state? - Answers -✔✔ An aromatic side chain; the
absorbed photon energy is lower.
In designing the experiment, the researchers used which type of 32P labeled ATP? -
Answers -✔✔ phosphoryl transfer from kinases comes from the γ-phosphate of ATP.
Therefore, the experiment should require γ32P-ATP
, Venturi effect - Answers -✔✔ oxygen pressure is the sum of the oxygen static pressure
P and the oxygen flow pressure ρv2/2. In the area of the mask openings, Pair = P +
ρv2/2, thus Pair > P. Air enters the mask because the static pressure of the air is larger
than the static pressure of the oxygen in flow.
What causes duplex DNA with a certain (A + T):(G + C) ratio to melt at a higher
temperature than comparable length duplex DNA with a greater (A + T):(G + C) ratio? -
Answers -✔✔ G-C base pairs form stronger π-stacking interactions than A-T base pairs,
What are the structural features possessed by storage lipids? - Answers -✔✔
triacylglycerols are neutral storage lipids --> Three fatty acids ester-linked to a single
glycerol
Two fatty acids ester-linked to a single glycerol plus a charged head group - Answers -
✔✔ lipid found in bilayer
lewis base - Answers -✔✔ donates electrons
if equilibrium constant for the reaction is very large (much greater than 1) - Answers -
✔✔ reaction is spontaneous
coordinate covalent bond - Answers -✔✔ Lewis acid-base interaction between a metal
cation and an electron pair donor
ex. [Cu(NH3)4]2+, Cu2+ = cation, ammonia = e pair donor
In [Cu(NH3)4]2+, the subscript 4 indicates which of the following? - Answers -✔✔ The
coordination number of Cu2+ only
coordination number=the number of ions of opposite charge that surround each ion in a
crystal
Why does NH3 displace H2O in the formation of [Cu(NH3)4]2+?
NH3 contains more lone pairs of electrons than H2O.
NH3 is a stronger Lewis base than H2O.
NH3 donates a lone pair of electrons more readily than does H2O. - Answers -✔✔ II
and III only
Which of the following atoms will be expected to have the smallest second ionization
energy?
A. Na
B. C
C. O
D. Ca - Answers -✔✔ Metals have lower ionization energies than non-metals as long as
the ionization event involves a valence electron. Since Na is an alkali metal, it has only
Solutions New Update
What is the total number of sp2-hybridized carbon atoms present in the fluorophore
used in the experiments? - Answers -✔✔ 9
The concentration of enzyme for each experiment was 5.0 μM. What is kcat for the
reaction at pH 4.5 with NO chloride added when Compound 3 is the substrate?
Passage: rate of product formation did not vary over time for the first 5 minutes -
Answers -✔✔ The fact that the rate of product formation did not vary over time for the
first 5 minutes implies that the enzyme was saturated with substrate. Under these
conditions, kcat = Vmax/[E]
= (125 nM/s)/5.0 μM = 2.5 × 10-2 s-1.
Absorption of ultraviolet light by organic molecules always results in what process? -
Answers -✔✔ Excitation of bound electrons
Bond breaking can subsequently result, as can ionization or bond vibration, but none of
these processes are guaranteed to result from the absorption of ultraviolet light.
Four organic compounds: 2-butanone, n-pentane, propanoic acid, and n-butanol,
present as a mixture, are separated by column chromatography using silica gel with
benzene as the eluent. What is the expected order of elution of these four organic
compounds from first to last? - Answers -✔✔ n-Pentane → 2-butanone → n-butanol →
propanoic acid
The four compounds have comparable molecular weights, so the order of elution will
depend on the polarity of the molecule. Since silica gel serves as the stationary phase
for the experiment, increasing the polarity of the eluting molecule will increase its affinity
for the stationary phase and increase the elution time (decreased Rf).
Why must the person either lean forward or slide their feet under the chair in order to
stand up? - Answers -✔✔ To keep the body in equilibrium while rising
Based on the relative energy of the absorbed electromagnetic radiation, which
absorber, a peptide bond or an aromatic side chain, exhibits an electronic excited state
that is closer in energy to the ground state? - Answers -✔✔ An aromatic side chain; the
absorbed photon energy is lower.
In designing the experiment, the researchers used which type of 32P labeled ATP? -
Answers -✔✔ phosphoryl transfer from kinases comes from the γ-phosphate of ATP.
Therefore, the experiment should require γ32P-ATP
, Venturi effect - Answers -✔✔ oxygen pressure is the sum of the oxygen static pressure
P and the oxygen flow pressure ρv2/2. In the area of the mask openings, Pair = P +
ρv2/2, thus Pair > P. Air enters the mask because the static pressure of the air is larger
than the static pressure of the oxygen in flow.
What causes duplex DNA with a certain (A + T):(G + C) ratio to melt at a higher
temperature than comparable length duplex DNA with a greater (A + T):(G + C) ratio? -
Answers -✔✔ G-C base pairs form stronger π-stacking interactions than A-T base pairs,
What are the structural features possessed by storage lipids? - Answers -✔✔
triacylglycerols are neutral storage lipids --> Three fatty acids ester-linked to a single
glycerol
Two fatty acids ester-linked to a single glycerol plus a charged head group - Answers -
✔✔ lipid found in bilayer
lewis base - Answers -✔✔ donates electrons
if equilibrium constant for the reaction is very large (much greater than 1) - Answers -
✔✔ reaction is spontaneous
coordinate covalent bond - Answers -✔✔ Lewis acid-base interaction between a metal
cation and an electron pair donor
ex. [Cu(NH3)4]2+, Cu2+ = cation, ammonia = e pair donor
In [Cu(NH3)4]2+, the subscript 4 indicates which of the following? - Answers -✔✔ The
coordination number of Cu2+ only
coordination number=the number of ions of opposite charge that surround each ion in a
crystal
Why does NH3 displace H2O in the formation of [Cu(NH3)4]2+?
NH3 contains more lone pairs of electrons than H2O.
NH3 is a stronger Lewis base than H2O.
NH3 donates a lone pair of electrons more readily than does H2O. - Answers -✔✔ II
and III only
Which of the following atoms will be expected to have the smallest second ionization
energy?
A. Na
B. C
C. O
D. Ca - Answers -✔✔ Metals have lower ionization energies than non-metals as long as
the ionization event involves a valence electron. Since Na is an alkali metal, it has only
