![]() (A product called HBOC-201, which is purified from cows, has been approved for human use in South Africa and Russia.) ![]() In addition to increasing supply for transfusions, rHb has a longer shelf life than red blood cells, is compatible with all blood types, and poses lower risk of transmitting disease.ĭespite these advantages, neither rHb products nor hemoglobin purified from animals has been licensed as therapy in the United States, mainly because of reports of hypertension and associated cardiovascular and cerebrovascular problems. One alternative currently being explored is to make recombinant human hemoglobin (rHb). Hospitals and clinics in the United States and around the world face constant shortages in the supply of blood for transfusions. Use the following passage to answer questions 1 through 4. Part 1: Biological and Biochemical Foundations of Living Systems The retina is the portion of the eye that contains the receptors activated by the light.Sample MCAT Biology & Biochemistry Questionsīelow are 10 practice questions to help you study for the Biology & Biochem portion of the MCAT exam. The genes for red-green color blindness will affect production of proteins in which of the following types of cells?Ī.Neurons in the visual center of the brainĭ.Visual receptor cells in the retina - correct answer D. Euchromatin is the form of DNA that is available for transcription. If the GAPDH gene is continuously expressed, where is it most likely found?ĭ.In a centromere - correct answer A. ![]() Nondisjunction - correct answer Error in meiosis in which homologous chromosomes fail to separate. Suitable PCR primers - correct answer High GC content, especially at the 5' and 3' ends How many electrons does NADH carry? FADH2? Coenzyme Q? Cytochrome C? - correct answer 2, 1 or 2, 2, 1 Watts to Joules - correct answer 1 W = 1 J/s How to convert from electron volt to joule - correct answer Multiple by elementary charge What functional group does aspartate side chain contain? - correct answer Carboxylate What does the d in dAMP stand for? - correct answer Deoxy Therefore, the crystalline lens will focus the light further back, that is on the retina.Īrchimedes' Principle - correct answer States that the buoyant force is equal to the weight of the fluid displaced by an object. A diverging lens spreads out light before it reaches the crystalline lens. The type of lens required is:ĭ.spherical. To correct for this condition, a thin lens is placed in front of the eye that will help to focus light on the retina. Myopia is a condition of the eye where the crystalline lens focuses the light rays to a position between the lens and the retina. Relationship between temperature and resistance - correct answer Directly proportional *Treat numerator and denominator separately when deciding if top or bottom sign Top sign: toward (if source or detector is moving toward other)īottom sign: away (if they moving away from other object) ![]() 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.ĭoppler effect equation - correct answer f' = f (Vw)/(Vw-Vs) The Doppler effect in ultrasound waves is used to provide fetal images. In order to image this motion, the ultrasound examination devices requires what minimal information?Ī.The speeds of the sound and of the moving object.ī.The speed of the sound, and the frequencies of the sound waves emitted and observed.Ĭ.The speeds of the sound and of the moving object, and the frequencies of the sound waves emitted and observed.ĭ.The speeds of the sound and of the moving object, and the frequencies and wavelengths of the sound waves emitted and observed. b outsideĪn ultrasound examination could show the motion of a fetus. When 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 tha.
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