MCAT AAMC PRACTICE EXAM 1

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MCAT AAMC PRACTICE EXAM 1

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -51 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation

Question 1: Gamma decay

Answer:

means the emission of a photon

Question 2: Standard atmospheric pressure

Answer:

760 mm Hg

Question 3: Adding strong acid to weak acid will

Answer:

decrease the amount of ionization of the weak acid -eg adding HCl to CH3CO2H will decrease the percent ionization of acetic acid

Question 4: Transcription factors

Answer:

bind DNA and subsequently recruit RNA polymerase

Question 5: Mitochondrial disruption occurs when

Answer:

the apoptotic machinery is stimulated

Question 6: Opsins

Answer:

function to enable the detection of different colors -there are a variety of different structurally related opsins to detect a variety of colors

Question 7: Cholesterol rich domains are located

Answer:

within lipid rafts

Question 8: The index of refraction of a medium

Answer:

equals the ratio of the speed of light in vacuum to the speed of light in the medium n= c/v Question 9: what is the most fundamental reason why ornithine is unlikely to be found in proteins synthesized in vivo

Answer:

there is no codon for it in the standard genetic code Question 10: What functional group forms during peptide bond formation between amino acids

Answer:

an amide group Question 11: Why is the velocity of blood flow slower in capillaries than in arteries

Answer:

the total cross-sectional area of capillaries exceeds that of arteries

Question 12: In beta decay

Answer:

a neutron is converted to a proton, therefore the atom will be changed to the one located just to the right on the periodic table (gain proton)

Question 13: What type of cell is most important in the exchange of O2 between the blod and the surrounding tissue

Answer:

Endothelial cells

Question 14: Ideal Gas refers to a gas in which

Answer:

individual molecular volume and intermolecular forces are considered negligible Question 15: The initial filtration step in the glomerulus of the mammalian kidney occurs primarily by

Answer:

passive flow due to a pressure difference (blood pressure forces fluid from glomerulus into lumen of Bowmans capsule)

Question 16: Specificity of enzyme means

Answer:

highly specific both in the reactions that they catalyze and in their choice of substrates -catalyze only a single chemical reaction or occasionally a set of closely related reactions Question 17: What type of bond is formed by glycogen synthase upon release of UDP

Answer:

alpha 1,4 glycosidic bond (the main linkages of glycogen)

Question 18: Enzymes do not

Answer:

alter substrate primary structure

Question 19: Energy of photon emitted

Answer:

E= hf h is 6.6x10^-34 Js f is frequency of radiation E is energy of photon -THz is 10^12 Hz

Question 20: Animal viruses

Answer:

are obligate intracellular parasites (only reproduce in a host cell) -they would therefore not grow on agar based medium

Question 21: Glomerular filtrate of the kidney is most concentrated

Answer:

in the medullary portion of the collecting duct

Question 22: The first peak in a gas chromatograph (gc trace) would be

Answer:

the one with the lowest molecular weight or weakest intermolecular forces of attraction -it would migrate the fastest making the first peak

Question 23: Circulating Erythrocytes

Answer:

do not contain DNA

Question 24: Acidic Side chains

Answer:

-are negatively charged at high pH -are neutral at low pH

Question 25: Lipase

Answer:

hydrolyzes fatty acids

Question 26: Rf in paper chromatography

Answer:

ratio of the distance traveled by the analyte relative to the solvent front during chromatographic separation

Question 27: Enzymes can

Answer:

co-localize substrates, alter local pH, alter substrate shape