MCAT AAMC/AAMC FL EXAM (2025)
QUESTIONS AND (elaborated) WITH
COMPLETE SOLUTIONS.
What is the chemical structure of a component found in four of the five cofactors used by Na+-
NQR?
says it is composed of flavin
structure is a nucleotide base
structure B could be
structure C also could be
structure D is an amino acid
down between B and C
to help, look at the captioned note on the table. it says Fl represents flavin which is the redox
active center in four of the five cofactors of Na+-NQR
C has an uniquinone AND HERE IS IS MENTIONED THAT UNIQUINONE IS IS A SUBSTATE
What is the ratio of cation to enzyme in the spectroelectrochemical experiments described in
the passage?
cation : enzyme
passage says Na+NQR was diluted to a final concentration of 0.75 mM in 0.150 molar of the
cation ions
cation .15 M:
The reaction between NADH and ubiquinone is exergonic, but the reaction, when catalyzed by
Na+-NQR, does not generate much heat in vivo. What factor accounts for this difference?
Conservation of energy, it is not created nor destroyed but merely changes forms
A. Is not possible, Even if it was heat generation would be larger for a catalyzed rection.
C. is impossible, reactants have to be close together to react
The movement of a charged particle against its concentration gradient is energetically costly.
Two open flasks I and II contain different volumes of the same liquid. Suppose that the pressure
is measured at a point 10 cm below the surface of the liquid in each container. How will the
pressures compare?
,pressure=pgh
g=10
p= density (same liquid so same density)
h= 10 cm
both have same height so pressure will be the same-- if heights were different pressure would
be different
Question
Which of the following substances is polar?
If there is a net dipole it is polar
Question
If all else is held constant, which of the following changes would NOT double the volume of a
gas?
pv=nrt
What is the number of neutrons in the nucleus of the atom used to produce laser radiations?
86Kr+ laser
86= mass
Kr has proton number as 36
86-36=50
the cation or anion charge with any element is indicative of the charge aka electron count
What is the molecular formula of the heterocyclic aromatic compound pyrrole?
passage says its a tetra pyrrole so there are 4 carbons
The radiation of wavelength 605 nm CANNOT be used to produce the fluorescence radiations
depicted in Figure 3 because:
Maybe if you read the passage for once in your life and not get confident then maybe you
wouldn't have to take the exam for a third time
Not D because look at the passage
not C because of E=hc/lambda (high wavelength low energy)
Approximately how many moles of Kr+ are contained in the laser tube at 0°C and 1 atm?
Have to recognize STP conditions of 0 C and 1 atm (22.4 L)
Volume in PV=nrt is in L
1cm^3=1mL
, The CD spectroscopy signal that was used to generate the data in Figure 1 arises from the
chirality of the:
look for what is chiral
B is not
C is not
D- most beta carbons are not chiral
Samples from various time points of the proteolysis of TPMTwt were subjected to SDS-PAGE
under reducing conditions. Which figure best depicts the expected appearance of the gel?
- For proteolysis, the protein is expected to be broken up over time
- Small fragments will travel faster in the SDS-PAGE
A and B show that they are building up or oligermizing
If the combined mass of the TPMT substrate and cofactor was determined before the
enzymatically catalyzed reaction and then compared to the combined mass of the product and
the cofactor after the reaction, the net change in molecular weight will be:
Passage says that TPMT is an enzyme (methyltransferase)
can also think about the conservation of mass
balance equation on products and reactants
The structure of Compound 2 is shown.
Compound 2
What structural feature(s) is(are) most important to the functioning of this compound as
described in the passage?
- Compound 2 helped extract the receptor
- Receptor is MPR (progesterone) steroid is hydrophobic so probably has to do someting with
that
Which experimental evidence suggests that the purified hMPRα obtained by the researchers
was in its native state?
Dude. Just stop. C is the answer. It literally says.
A. The tags that were used for extraction could still intefere with the protein's native
function/binding
A major obstacle to obtaining useful energy from a nuclear fusion reactor is containment of the
fuel at the very high temperatures required for fusion. The reason such high temperatures are
required is to:
QUESTIONS AND (elaborated) WITH
COMPLETE SOLUTIONS.
What is the chemical structure of a component found in four of the five cofactors used by Na+-
NQR?
says it is composed of flavin
structure is a nucleotide base
structure B could be
structure C also could be
structure D is an amino acid
down between B and C
to help, look at the captioned note on the table. it says Fl represents flavin which is the redox
active center in four of the five cofactors of Na+-NQR
C has an uniquinone AND HERE IS IS MENTIONED THAT UNIQUINONE IS IS A SUBSTATE
What is the ratio of cation to enzyme in the spectroelectrochemical experiments described in
the passage?
cation : enzyme
passage says Na+NQR was diluted to a final concentration of 0.75 mM in 0.150 molar of the
cation ions
cation .15 M:
The reaction between NADH and ubiquinone is exergonic, but the reaction, when catalyzed by
Na+-NQR, does not generate much heat in vivo. What factor accounts for this difference?
Conservation of energy, it is not created nor destroyed but merely changes forms
A. Is not possible, Even if it was heat generation would be larger for a catalyzed rection.
C. is impossible, reactants have to be close together to react
The movement of a charged particle against its concentration gradient is energetically costly.
Two open flasks I and II contain different volumes of the same liquid. Suppose that the pressure
is measured at a point 10 cm below the surface of the liquid in each container. How will the
pressures compare?
,pressure=pgh
g=10
p= density (same liquid so same density)
h= 10 cm
both have same height so pressure will be the same-- if heights were different pressure would
be different
Question
Which of the following substances is polar?
If there is a net dipole it is polar
Question
If all else is held constant, which of the following changes would NOT double the volume of a
gas?
pv=nrt
What is the number of neutrons in the nucleus of the atom used to produce laser radiations?
86Kr+ laser
86= mass
Kr has proton number as 36
86-36=50
the cation or anion charge with any element is indicative of the charge aka electron count
What is the molecular formula of the heterocyclic aromatic compound pyrrole?
passage says its a tetra pyrrole so there are 4 carbons
The radiation of wavelength 605 nm CANNOT be used to produce the fluorescence radiations
depicted in Figure 3 because:
Maybe if you read the passage for once in your life and not get confident then maybe you
wouldn't have to take the exam for a third time
Not D because look at the passage
not C because of E=hc/lambda (high wavelength low energy)
Approximately how many moles of Kr+ are contained in the laser tube at 0°C and 1 atm?
Have to recognize STP conditions of 0 C and 1 atm (22.4 L)
Volume in PV=nrt is in L
1cm^3=1mL
, The CD spectroscopy signal that was used to generate the data in Figure 1 arises from the
chirality of the:
look for what is chiral
B is not
C is not
D- most beta carbons are not chiral
Samples from various time points of the proteolysis of TPMTwt were subjected to SDS-PAGE
under reducing conditions. Which figure best depicts the expected appearance of the gel?
- For proteolysis, the protein is expected to be broken up over time
- Small fragments will travel faster in the SDS-PAGE
A and B show that they are building up or oligermizing
If the combined mass of the TPMT substrate and cofactor was determined before the
enzymatically catalyzed reaction and then compared to the combined mass of the product and
the cofactor after the reaction, the net change in molecular weight will be:
Passage says that TPMT is an enzyme (methyltransferase)
can also think about the conservation of mass
balance equation on products and reactants
The structure of Compound 2 is shown.
Compound 2
What structural feature(s) is(are) most important to the functioning of this compound as
described in the passage?
- Compound 2 helped extract the receptor
- Receptor is MPR (progesterone) steroid is hydrophobic so probably has to do someting with
that
Which experimental evidence suggests that the purified hMPRα obtained by the researchers
was in its native state?
Dude. Just stop. C is the answer. It literally says.
A. The tags that were used for extraction could still intefere with the protein's native
function/binding
A major obstacle to obtaining useful energy from a nuclear fusion reactor is containment of the
fuel at the very high temperatures required for fusion. The reason such high temperatures are
required is to:
