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MCAT Organic Question — Chlorines Molecule

October 22, 2014

Consider the following two molecules:


The two molecules above can be described as:


A) enantiomers.

B) diastereomers.

C) tautomers.

D) conformers.


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MCAT Biology Question — Hardy-Weinberg Equilibrium

October 21, 2014

Which of the following theoretical populations would LEAST meet the requirements of the Hardy-Weinberg equilibrium?


A) A population small mammals with an infinite number of individuals in which there is no migration, generations overlap slightly, and mating is random

B) A population of large birds who only reproduce upon reaching 50 years of age, who mate for life, who only produce one offspring at a time, and who invest over five years in rearing each young before it leaves the next.

C) A population of newts consisting of a small number of individuals confined to a single cave that prevents migration, in which sexual selection prefers smaller males.

D) A population of gibbons living in a stable jungle ecosystem with a large number of randomly mating individuals, in which the allele frequencies are equal between sexes and from which a few individuals migrate each year.


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MCAT Chemistry Question — Thermodynamics Law

October 20, 2014

The human body takes biological monomers in the form of amino acids and sugars and builds highly complex physiological structures from them. As such, the human body’s relationship with the second law of thermodynamics can best be described by which of the following:


A) The human body is an example of how biological systems are not part of the domain of the second law of thermodynamics, since they decrease entropy through anabolic processes.

B) There is an equilibrium between anabolism and catabolism in the human body, thus it falls under the second law of thermodynamics by not increasing entropy.

C) The human body follows the second law of thermodynamics by creating decreasing entropy within the system by increasing the entropy of the environment.

D) It is impossible to relate thermodynamic laws to complex physiological systems.


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MCAT Biology Question — DFP

October 17, 2014

Diisopropylfluorophosphate (DFP) binds to the active site of acetylcholinesterase (ACE) in the synapses of neurons. When DFP binds to ACE, the ACE enzyme is rendered permanently inactive. This makes DFP a potent toxin, with lethal amounts at less than 100 mg. The interaction between DFP and ACE can best be characterized as:


A) Competitive inhibition
B) Noncompetitive inhibition
C) Irreversible inhibition
D) Partially competitive inhibition


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MCAT Chemistry Question — Catalyst

October 16, 2014

The scientist adds a small amount of catalyst to a 1L reaction vessel containing 2.03 mol of A2, 6.89 mol of B3C, 14.00 mol of AB2, and 2.50 mol of C2. Which of the following will occur?


3 A2 + 4 B3C → 6 AB2 + 2 C2

Keq = 5.13 x 10-2


A. The reaction will more swiftly proceed to the left.

B. The reaction will more swiftly proceed to the right.

C. The addition of a catalyst does nothing to a reaction at equilibrium, so the reaction will remain at equilibrium.

D. No conclusion can be drawn.


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MCAT Physics Question — Electric Current Flow

October 15, 2014

The flow of electric current can most aptly be described as:


A) the flow of positive charges from a region of high potential to a region of low potential.

B) the flow of positive charges from a region of low potential to a region of high potential.

C) the flow of negative charges (electrons) from a region of high potential to a region of low potential.

D) the flux of electric field lines due to inductive effects created by electromagnetic potential.


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MCAT Chemistry Question — Weak Base

October 14, 2014

For a very weak base, the pKb of a solution would likely be:


A. Equal to the pOH

B. Higher than the pOH

C. Lower than the pOH

D. Near 7 at 25ºC


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MCAT Biology Question — Genetic Drift

October 13, 2014

Which of the following is (are) true regarding genetic drift?


I) Genetic drift has more pronounced effect on alleles with a low allele frequency than on alleles with a high allele frequency, regardless of population size.
II) Genetic drift is due to random sampling during reproduction.
III) The more isolated a population is, the less pronounced the effect of genetic drift is.


A) I only

B) II only

C) I and II only

D) II and III only


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MCAT Organic Question — Chiral Carbon

October 10, 2014

A chiral carbon, C, is bonded to four different substituent groups: A, B, C, and D.

chiral carbon

Which compound is identical to the molecule depicted above?

chiral carbons

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MCAT Chemistry Question — Spontaneous Reaction

October 9, 2014

Consider the following reaction:


C6H12O6 (s) + 6 O2 (g) → 6 CO2 (g) + 6 H2O (l) ΔH = – 2808 kJ / mol


Under what conditions will this reaction proceed spontaneously?


A. Low temperature, low pressure

B. Low temperature, any pressure

C. High temperature, any pressure

D. Any temperature, any pressure


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