FL 5 AAMC MCAT question with complete solution 2023

FL 5 AAMC MCAT question with complete solution 2023What is the chemical structure of a component found in four of the five cofactors used by Na+-NQR? - correct answer says it is composed of flavin structure is a nucleotide base structure B could be structure C also could be structure D is an amino acid down between B and C to help, look at the captioned note on the table. it says Fl represents flavin which is the redox active center in four of the five cofactors of Na+-NQR C has an ubiquinone AND HERE IS IS MENTIONED THAT UNIQUINONE IS IS A SUBSTATE What is the ratio of cation to enzyme in the spectroelectrochemical experiments described in the passage? - correct answer cation : enzyme passage says Na+NQR was diluted to a final concentration of 0.75 mM in 0.150 molar of the cation ions cation .15 M: The reaction between NADH and ubiquinone is exergonic, but the reaction, when catalyzed by Na+-NQR, does not generate much heat in vivo. What factor accounts for this difference? - correct answer Conservation of energy, it is not created nor destroyed but merely changes forms A. Is not possible, Even if it was heat generation would be larger for a catalyzed rection. C. is impossible, reactants have to be close together to react The movement of a charged particle against its concentration gradient is energetically costly. Two open flasks I and II contain different volumes of the same liquid. Suppose that the pressure is measured at a point 10 cm below the surface of the liquid in each container. How will the pressures compare? - correct answer pressure=pgh g=10 p= density (same liquid so same density) h= 10 cm both have same height so pressure will be the same-- if heights were different pressure would be different Question Which of the following substances is polar? - correct answer If there is a net dipole it is polar Question If all else is held constant, which of the following changes would NOT double the volume of a gas? - correct answer pv=nrt What is the number of neutrons in the nucleus of the atom used to produce laser radiations? - correct answer 86Kr+ laser 86= mass Kr has proton number as 36 86-36=50 the cation or anion charge with any element is indicative of the charge aka electron count What is the molecular formula of the heterocyclic aromatic compound pyrrole? - correct answer passage says its a tetra pyrrole so there are 4 carbons The radiation of wavelength 605 nm CANNOT be used to produce the fluorescence radiations depicted in Figure 3 because: - correct answer Maybe if you read the passage for once in your life and not get confident then maybe you wouldn't have to take the exam for a third time Not D because look at the passage not C because of E=hc/lambda (high wavelength low energy) Approximately how many moles of Kr+ are contained in the laser tube at 0°C and 1 atm? - correct answer Have to recognize STP conditions of 0 C and 1 atm (22.4 L) Volume in PV=nrt is in L 1cm^3=1mL The CD spectroscopy signal that was used to generate the data in Figure 1 arises from the chirality of the: - correct answer look for what is chiral B is not C is not D- most beta carbons are not chiral Samples from various time points of the proteolysis of TPMTwt were subjected to SDS-PAGE under reducing conditions. Which figure best depicts the expected appearance of the gel? - correct answer - For proteolysis, the protein is expected to be broken up over time - Small fragments will travel faster in the SDS-PAGE A and B show that they are building up or oligermizing If the combined mass of the TPMT substrate and cofactor was determined before the enzymatically catalyzed reaction and then compared to the combined mass of the product and the cofactor after the reaction, the net change in molecular weight will be: - correct answer Passage says that TPMT is an enzyme (methyltransferase) can also think about the conservation of mass balance equation on products and reactants The structure of Compound 2 is shown. Compound 2 What structural feature(s) is(are) most important to the functioning of this compound as described in the passage? - correct answer - Compound 2 helped extract the receptor - Receptor is MPR (progesterone) steroid is hydrophobic so probably has to do someting with that