Compound 1 was designed to exhibit pH-dependent self-assembly. The answer to this question is A because serine is the residue that was phosphorylated, and phosphorylation enabled the protein to be subsequently attached to hydroxyapatite (HA). Which amino acid was incorporated into Compound 1 as a future site of covalent attachment to HA prior to mineralization? The residues that were engineered into the peptide for cell adhesion are arginine and aspartate as can be reasoned based on the structure of the peptide provided, and the description of the roles of the various residues provided in the passage. Which amino acid residues were incorporated into Compound 1 to promote the adhesion of cells on the scaffold surfaces? Multiple pieces of information point to the fact that the interaction is disulfide bond formation, including the fact that an oxidant causes the formation of Compound 2, which can be reversed by the addition of a reducing agent. It can be reasoned that the interaction described is intermolecular in nature, since multiple molecules of micellular Compound 1 come together to form Compound 2, which is a solid. Compared to micellular Compound 1, Compound 2 is structurally more rigid as a result of what type of interaction?ĭ) Intramolecular covalent bonding B) Intermolecular covalent bonding Therefore, only (1/2)5 = 1/32 of the sample will be left after 10 minutes, while 31/32 of the sample will decay. The answer to this question is D because the half-life of 15O is 2 minutes thus, 10 minutes = 5 half-lives. "The location of internal organs where changes in the calcium content occur can be found by placing positron-emitting isotopes such as O-15 (with a half-life = 2 min) into the patient's bloodstream)
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What fraction of a O-15 sample decays in 10 min? The answer to this question is B because the pulse pressure in a healthy adult is (120 − 75) mmHg = 45 mmHg, and so the percentage is 45 mmHg/760 mmHg = 6%. The maximum and minimum blood pressures of a healthy adult are about Ps = 120 mmHg and Pd = 75 mmHg. What percentage of standard atmospheric pressure is the pulse pressure of a healthy adult? The answer to this question is D because the energy of a photon of frequency 610 THz is equal to 6.6 x 10-34 J What is the energy of the photons emitted by the LED at a frequency of 610 THz? (Note: h = 6.6 × 10-34 J Thus, intensity is directly proportional to the number of photons emitted. The answer to this question is D because the energy of electromagnetic radiation is directly proportional to the number of photons, and the intensity of electromagnetic radiation is defined as energy emitted per unit time. The intensity of the radiation emitted by the oxygen sensor is directly proportional to the:ĭ) number of photons emitted D) number of photons emitted The answer to this question is B because the index of refraction of a medium is equal to the ratio of the speed of light in vacuum to the speed of light in the medium, thus it is equal to (3.0 x 108 m/s)/(2.1 x 108 m/s) = 1.4. Knowing that the speed of light in the vitreous humor is 2.1 × 108 m/s, what is the index of refraction of the vitreous humor? (Note: The speed of light in a vacuum is 3.0 × 108 m/s.) If current increases and resistance is constant, then voltage increases as well. The answer to this question is B because according to Ohm's law, current is equal to voltage divided by resistance. When the current in the micro-robot's circuit increases and the resistance of the circuit remains constant, the voltage of the circuit: The answer to this question is C because HCl is a strong acid that will increase the amount of H+ in solution and thus decrease the percentage of CH3CO2H that ionizes. Which of the following will decrease the percentage ionization of 1.0 M acetic acid, CH3CO2H(aq)?*ĭ) Adding a drop of basic indicator C) Adding concentrated HCl (aq) The answer is D because the stabilization of the transition state, not the substrate, provides binding energy that is used to lower the activation energy. D) the transition state changes the activation energy of the reaction.
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Which statement correctly describes how enzymes affect chemical reactions? Stabilization of:Ī) the substrate changes the free energy of the reaction.ī) the transition state changes the free energy of the reaction.Ĭ) the substrate changes the activation energy of the reaction.ĭ) the transition state changes the activation energy of the reaction.
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