AAMC PRACTICE TEST 1 WITH
CORRECT ANSWERS
paper chromatography ANSWER method of separating a
mixture of different colours. The liquid soaks through the paper
and carries the mixture with it. Some substances are carried
faster than others so the substances are separated along the
paper
...
paper chromatography ANSWER method of separating a
mixture of different colours. The liquid soaks through the paper
and carries the mixture with it. Some substances are carried
faster than others so the substances are separated along the
paper
*WATER ABOSORBED ON CELLULOSE BY HYDROGEN
BONDS.
Rf ANSWER ratio of distance traveled for paper and thin layer
chromatography. (distance traveled by pigment/ distance
traveled by solvent font)
amide group versus amine group ANSWER amino acids form
amide groups, amide has 1 hydrogen amine has 2 attached
gas-liquid chromatography ANSWER An advanced form of
chromatography that uses an inert gas as the mobile phase
and a column of gel-coated beads as the stationary phase.
lowest molecular weight and intermolecular forces of attraction
there migrates the fastest.
S configuration
R configuration ANSWER counterclockwise
clockwise
-nucleophile attacks the compound at the same time as the
leaving group leaves
-Nucleophile actively displaces the leaving group in a backside
attack
for this to occur, nucleophile must be strong & substrate can't
be sterically hindered
-concentrations of substrate & nucleophile have role in
determining the rate --> rate = k[Nu][R-L]
-Position of the substituents around the substrate carbon is
inverted
stereochemistry INVERTED!!
Enzymes ANSWER Catalysts for chemical reactions in living
things
stabilizes the transition state not the substrate!!
percentage ionization ANSWER Percentage of the molecules
that form ions in a solution
example: if given an Acid that needs to decrease percentage of
ionization, add acid in it so less will be ionized.
Ohm's Law ANSWER V=IR
voltage=current*resistance
index of refraction ANSWER a measure of the amount a ray of
light bends when it passes from one medium to another
3.00*10^8/ speed of light in medium= index of refraction
,Energy and Electromagnetic Radiation ANSWER directly
proportional to number of photons
Energy equation ANSWER E=hv
What is the relationship between Pp, PMPA, and Pd?
ANSWER Pp = 3PMPA − 3Pd
PPMA = Pd + (Ps - Pd)/3 = Pd +Pp/3
equation 1= ppma= Pd+(ps-pd)/3
equation 2= pp= (ps-pd)
ppma=pd+PP/3
pp=3ppma-3pd
What percentage of standard atmospheric pressure is the pulse
pressure of a healthy adult? ANSWER (120 − 75) mmHg = 45
mmHg, and so the percentage is 45 mmHg/760 mmHg = 6%.
What fraction of a 15O sample decays in 10 min? ANSWER
The answer to this question is D because the half-life of 15O is
2 minutes; thus, 10 minutes = 5 half-lives. Therefore, only
(1/2)5 = 1/32 of the sample will be left after 10 minutes, while
31/32 of the sample will decay.
What is the work generated by a healthy adult who circulates 9
L of blood through the brachial artery in 10 min?
know Work formula ANSWER P=W/T
Look at graph: A flow of 9 liters in 10 minutes means a flow rate
of 900 mL/min, and according to the graph, it corresponds to a
power of 200 W. The work is then 200 W ´ 600 s = 120 kJ.P=
W/time
, inter versus intra ANSWER Inter means existing between, while
intra means within or on the inside. Inter and intra are both
prefixes, or words that are placed before a stem word to
change the definition.
Compared to micellular Compound 1, Compound 2 is
structurally more rigid as a result of what type of interaction?
ANSWER It can be reasoned that the interaction described is
intermolecular in nature, since multiple molecules of micellular
Compound 1 come together to form Compound 2, which is a
solid. Multiple pieces of information point to the fact that the
interaction is disulfide bond formation, including the fact that an
oxidant causes the formation of Compound 2, which can be
reversed by the addition of a reducing agent.
Which amino acid residues were incorporated into Compound 1
to promote the adhesion of cells on the scaffold surfaces?
ANSWER The residues that were engineered into the peptide
for cell adhesion are arginine and aspartate as can be
reasoned based on the structure of the peptide provided, and
the description of the roles of the various residues provided in
the passage.
hydrophillic amino acids ANSWER Charged side chains
including arginine, glutamine, asparagine, lysine, and histidine
hydrophobic amino acids ANSWER amino acids with long alkyl
side chains. Alanine, Leucine, Isoleucine, Valine,
Phenylalanine. More likely to be found in the interior of proteins
Which amino acid was incorporated into Compound 1 as a
future site of covalent attachment to HA prior to mineralization?
ANSWER serine can be phosphorylated.
because serine is the residue that was phosphorylated, and
phosphorylation enabled the protein to be subsequently
attached to hydroxyapatite (HA).
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