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AAMC MCAT Practice Exam 1 questions and answers graded A+ 2024/2025
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AAMC MCAT Practice Exam 1 questions and answers graded A+ 2024/2025
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AAMC MCAT Practice Exam 1In the chromatography of the response aggregate, water absorbed on cellulose functioned as
the desk bound phase. What turned into the foremost factor figuring out the migration of man or
woman additives inside the sample?
A) Hydrogen bonding
B) Solute attention
C) Stationary segment attention
D) Thickness of paper - ANSA) Hydrogen bonding
The answer to this query is A due to the fact the relative amount of hydrogen bonding to the
stationary phase will decide the relative fee of migration of the numerous components within the
sample.
What assumption is being made if scientists finish that aspartic acid changed into fashioned by
the prebiological synthesis inside the passage?
A) Aspartic acid is volatile at temperatures under a hundred and fifty levels C.
B) All of the malic acid underwent the dehydration reaction to form fumaric/maleic acid.
C) Compound A and cyanide were available on primitive Earth.
D) The response among ammonia and fumaric acid turned into catalyzed by way of the
presence of water. - ANSC) Compound A and cyanide have been to be had on primitive Earth.
He solution to this query is C considering the fact that, in order for the experimental reaction
series to be relevant to the primordial formation of aspartic acid, the starting materials used
(Compound A and cyanide) are assumed to were available.
According to the developed chromatography plate shown beneath, what's the approximate Rf
fee of aspartic acid?
Aspartic acid = 2
solvent the front = 10
A) zero.20
B) 0.50
C) 5
D) 10 - ANSThe answer to this query is A (0.20) because Rf is the ratio of the space travelled
with the aid of the analyte relative to the solvent the front at some stage in a chromatographic
separation. Aspartic acid travelled gadgets, even as the solvent the front travelled ten devices,
giving an Rf of 2/10 = zero.20 for aspartic acid.
,Which of the following statements does NOT efficiently describe the dehydration of malic acid to
fumaric acid and maleic acid?
A) The reaction takes place most readily with tertiary alcohols.
B) The reaction entails the lack of a water molecule.
C) The reaction has a carbocation intermediate.
D) The reaction is stereospecific. - ANSD) The response is stereospecific.
The answer to this question is D due to the fact the reality that each fumaric and maleic acid are
produced means that the dehydration of malic acid is NOT stereospecific.
What form of functional institution is fashioned whilst aspartic acid reacts with any other amino
acid to shape a peptide bond?
A) An amine organization
B) An aldehyde institution
C) An amide organization
D) A carboxyl organization - ANSC) An amide group
The answer to this query is C because the purposeful group that bureaucracy for the duration of
peptide bond formation is referred to as an amide institution.
If 2-pentanol replaces 1-pentanol within the response shown in Figure 3 (SN2), the price of
substitution is less because:
A) the C-O bond in 2-pentanol is stronger than the C-O bond in 1-pentanol.
B) there may be a competing elimination reaction that slows the rate of substitution.
C) there's more steric predicament at the oxygen atom in 2-pentanol than in 1-pentanol, making
protonation less probable.
D) there may be greater steric trouble at the two-role of 2-pentanol than on the 1-role of
1-pentanol. - ANSD) there's extra steric difficulty at the 2-function of two-pentanol than on the
1-position of one-pentanol.
The solution to this question is D due to the fact the fee of substitution of protonated alcohols is
situation to steric obstacle. This inhibits the ability of nucleophiles to collide with the reacting
electrophilic center and slows the price of response.
If a solution containing the compounds shown in Figure 4, is injected right into a fuel-liquid
chromatograph, the primary height determined inside the gc trace is because of which
compound?
A) Methyl-2-butanol
B) Methyl-2-butene
C) Chloro-2-methylbutane
D) Bromo-2-mehtylbutane - ANSB) Methyl-2-butene
,The solution to this question is B due to the fact 2-methyl-2-butene will show off the bottom
molecular weight and additionally the weakest intermolecular forces of appeal. This substance
will therefore migrate the quickest and be the primary height in the gasoline chromatograph (gc)
hint.
R vs. S stereochemistry* - ANSR = clockwise
C = counter-clockwise
Acetic acid and ethanol react to shape an ester product as shown underneath.
In figuring out which reactant loses the -OH institution, which of the subsequent isotopic
substitutions would be most useful?
A) Replace the acidic H of acetic acid with D
B) Replace the alcoholic H of ethanol with D.
C) Replace the carbonyl oxygen of acetic acid with O-18.
D) Replace the hydroxyl oxygen of ethanol with O-18. - ANSD) Replace the hydroxyl oxygen of
ethanol with O-18.
The solution to this query is D due to the fact this experiment includes labeling a set which does
now not trade with different agencies gift prior to reaction and will therefore supply statistics
about the true identity of the businesses, which can be exchanged during the reaction.
A person whose eye has a lens-to-retina distance of 2.0 cm, can simplest absolutely see
gadgets which might be nearer than 1.0 m away. What is the energy S of the character's eye
lens? (Note: Use the skinny lens components 1/O + 1/I = S)
A) -50 D
B) -10 D
C) fifty one D
D) 55 D - ANSC) 51 D
The answer to this query is C due to the fact the energy of the attention lens is equal to the
inverse of the focal length of the eye lens. Its numerical cost is given by (1 m)-1+(zero.02
m)-1=1 D+50 D=51 D.
Which statement correctly describes how enzymes have an effect on chemical reactions?
Stabilization of:
A) the substrate modifications the unfastened energy of the reaction.
B) the transition kingdom changes the loose power of the reaction.
C) the substrate changes the activation electricity of the response.
D) the transition nation adjustments the activation electricity of the response. - ANSD) the
transition state modifications the activation energy of the response.
, The solution is D because the stabilization of the transition state, now not the substrate, offers
binding electricity that is used to decrease the activation strength.
Which of the subsequent will decrease the proportion ionization of one.Zero M acetic acid,
CH3CO2H(aq)?*
A) Chlorinating the CH3 organization
B) Diluting the solution
C) Adding concentrated HCl (aq)
D) Adding a drop of basic indicator - ANSC) Adding concentrated HCl (aq)
The solution to this query is C due to the fact HCl is a robust acid as a way to increase the
amount of H+ in solution and as a consequence lower the percentage of CH3CO2H that ionizes.
When the present day inside the micro-robotic's circuit will increase and the resistance of the
circuit stays regular, the voltage of the circuit:
A) decreases
B) increases
C) is constant
D) is 0 - ANSB) increases
V = IR
The answer to this question is B due to the fact in keeping with Ohm's law, current is same to
voltage divided by resistance. If modern-day increases and resistance is consistent, then
voltage increases as nicely.
Knowing that the speed of mild within the vitreous humor is 2.1 × 108 m/s, what is the index of
refraction of the vitreous humor? (Note: The pace of light in a vacuum is 3.Zero × 108 m/s.)
A) 0.7
B) 1.Four
C) 2.1
D) three.Zero - ANSB) 1.4
n = c/v
The answer to this query is B because the index of refraction of a medium is same to the ratio of
the speed of mild in vacuum to the rate of mild within the medium, for this reason it's far identical
to (three.Zero x 108 m/s)/(2.1 x 108 m/s) = 1.Four.
The intensity of the radiation emitted by way of the oxygen sensor is at once proportional to the:
A) propagation pace of the radiation
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