MCAT AAMC FL 1EXAM QUESTIONS AND ANSWERS

MCAT AAMC FL 1EXAM QUESTIONS AND ANSWERS What was the principal factor determining the migration of individual components in a sample when performing chromatography? -Answer-the relative amount of hydrogen bonding to the stationary phase Rf value -Answer-Distance travelled by substance / distance travelled by solvent stereospecific reaction -Answer-a special type of stereoselective reaction in which the stereochemistry of the product is dependent on the stereochemistry of the starting material if two different isomer products form, that means that the reaction is not stereospecific E1 vs. E2 reactions -Answer- dehydration reaction -Answer-A chemical reaction in which two molecules covalently bond to each other with the removal of a water molecule reaction occurs most readily with tertiary carbocations since E1 reactions have big barrier preference for stable carbocations to determine which reactant loses a specific functional group/atom, what should be isotopically substituted? -Answer-labeling a group which does not exchange with other groups present prior to the reaction and will therefore give information about the true identity of the groups that are exchanged during the reaction you wanna label whatever is retained from the reactants to the final product Strength of lens -Answer-inverse of focal length 1/O + 1/I = S units in diopters (D = 1/m) how do enzymes affect chemical reactions? -Answer-stabilizes the transition state, thus providing binding energy that can lower the activation energy of the reaction, and allowing the reaction to proceed faster do so by colocalizing substrates, altering local pH, and altering substrate shape percent ionization -Answer-ratio of the concentration of the ionized acid to the initial acid concentration, times 100 percent ionization decreases with increasing acid concentration (makes the denominator larger) index of refraction equation -Answer-n = c/v Intensity of electromagnetic radiation -Answer-- energy emitted per unit time - directly proportional to number of photons emitted - more photons emitted = more intense radiation atmospheric pressure value -Answer-760 mm Hg = 1 atm = 101325 Pa = 1.01325 bar intermolecular bonds -Answer-chemical bonds between molecules/compounds intramolecular bonds -Answer-chemical bonds between atoms Why is the velocity of blood flow slower in capillaries than in arteries? -Answer-because of the high number of capillaries in the body, the total cross-sectional area of these vessels is larger than any other vessel type in the circulatory system. This causes the velocity of the blood to decrease volumetric flow rate -Answer-Q = V/t = Ad/t Q = Av Ideal Gas Law Assumptions -Answer-(1) the gas consists of a large number of molecules, which are in random motion and obey Newton's laws of motion; (2) the volume of the molecules is negligibly small compared to the volume occupied by the gas; and (3) no forces act on the molecules except during elastic collisions of negligible duration. STP (standard temperature and pressure) -Answer-One gram-mole occupies a volume of 22.4 L at 0°C (273K) and one atmosphere pressure visible light spectrum -Answer-400-700 nm VIBGYOR if a compound is primarily composed of carbons and hydrogens, it is most likely... -Answer- hydrophobic major source of phosphate for kinases -Answer-typically ATP function of lipase -Answer-hydrolyze fatty acids (lipase = lipid lysis) Numbering convention for a hexose ring -Answer- Numbering convention for a pentose ring -Answer- glycogen synthase -Answer-RATE LIMITING enzyme of glycogenesis responsible for making the alpha 1,4 glycosidic bonds as the granul