FL 5 AAMC MCAT EXAM QUESTIONS
AND ANSWERS GRADED A+ 2025/2026
What is the chemical structure of a component found in four of the five cofactors used by Na+-
NQR? - ANS 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? - ANS 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? -
ANS Conservation of energy, it is not created nor destroyed but merely changes forms
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
,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? - ANS 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? - ANS 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? - ANS pv=nrt
What is the number of neutrons in the nucleus of the atom used to produce laser radiations? -
ANS 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
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, What is the molecular formula of the heterocyclic aromatic compound pyrrole? -
ANS 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: - ANS 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? -
ANS 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: - ANS 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? -
ANS - 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
3 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
AND ANSWERS GRADED A+ 2025/2026
What is the chemical structure of a component found in four of the five cofactors used by Na+-
NQR? - ANS 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? - ANS 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? -
ANS Conservation of energy, it is not created nor destroyed but merely changes forms
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
,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? - ANS 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? - ANS 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? - ANS pv=nrt
What is the number of neutrons in the nucleus of the atom used to produce laser radiations? -
ANS 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
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, What is the molecular formula of the heterocyclic aromatic compound pyrrole? -
ANS 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: - ANS 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? -
ANS 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: - ANS 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? -
ANS - 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
3 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
