AAMC MCAT Official Prep Free Sample Test 2023

AAMC MCAT Official Prep Free Sample Test 2023When the level of liquid inside a buret is higher than outside, what does that mean for the gas pressure inside the buret? - correct answer It is lower thab outside An ultrasound examination could show the motion of a fetus. In order to image this motion, the ultrasound examination devices requires what minimal information? A.The speeds of the sound and of the moving object. B.The speed of the sound, and the frequencies of the sound waves emitted and observed. C.The speeds of the sound and of the moving object, and the frequencies of the sound waves emitted and observed. D.The speeds of the sound and of the moving object, and the frequencies and wavelengths of the sound waves emitted and observed. - correct answer B. The Doppler effect in ultrasound waves is used to provide fetal images. The Doppler effect relates the frequency of the ultrasound wave as detected by a moving detector to the frequency of the wave when the source is stationary, the speed of the source, and the speed of the detector. Doppler effect equation - correct answer f' = f (Vw)/(Vw-Vs) where V = speed of sound in the medium Vd = speed of the detector Vs = speed of the source Top sign: toward (if source or detector is moving toward other) Bottom sign: away (if they moving away from other object) *Treat numerator and denominator separately when deciding if top or bottom sign Relationship between temperature and resistance - correct answer Directly proportional IR peaks - correct answer --Carboxylic Acid: OH (~3000); C=O (~1700); C-O (~1200) -- Alcohol: OH (~3000); C-O (~1200) --Ester: C=O (~1700); C-O (~1200) Myopia is a condition of the eye where the crystalline lens focuses the light rays to a position between the lens and the retina. To correct for this condition, a thin lens is placed in front of the eye that will help to focus light on the retina. The type of lens required is: A.cylindrical. B.converging. C.diverging. D.spherical. - correct answer C. A diverging lens spreads out light before it reaches the crystalline lens. Therefore, the crystalline lens will focus the light further back, that is on the retina. Archimedes' Principle - correct answer States that the buoyant force is equal to the weight of the fluid displaced by an object. What does the d in dAMP stand for? - correct answer Deoxy What functional group does aspartate side chain contain? - correct answer Carboxylate How to convert from electron volt to joule - correct answer Multiple by elementary charge Watts to Joules - correct answer 1 W = 1 J/s How many electrons does NADH carry? FADH2? Coenzyme Q? Cytochrome C? - correct answer 2, 1 or 2, 2, 1 Suitable PCR primers - correct answer High GC content, especially at the 5' and 3' ends Nondisjunction - correct answer Error in meiosis in which homologous chromosomes fail to separate. Occurs in anaphase If the GAPDH gene is continuously expressed, where is it most likely found? A.In euchromatin B.In a telomere C.In heterochromatin D.In a centromere - correct answer A. Euchromatin is the form of DNA that is available for transcription. The genes for red-green color blindness will affect production of proteins in which of the following types of cells? A.Neurons in the visual center of the brain B.Neurons making up the optic nerve C.Pigment cells of the iris D.Visual receptor cells in the retina - correct answer D. The retina is the portion of the eye that contains the receptors activated by the light.