Which of these is an advantage of phosphate buffer solutions in biological research? Select one: a. It is non-toxic to cells b. It is isotonic to the cellular environment c. It helps to maintain a constant pH in a chemical reaction d. All of the above
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- Relative tonicity compares the _____________ of two environments. A. Solute concentration B. Solvent concentration C. Difference in types of solutes D. Difference in types of solventsWhich of the following statements is TRUE regarding drugs that are weak acids/bases? A. if the target is inside the cell membrane, then the shape ofB. the active is the one that is not ionizedC. all answers are correctD. The degree of ionization is determined by the pH of the environmentE. The degree of ionization is determined by the pKa value of the drugOne example is phenobarbital There are some drugs that are active even after being metabolized. An example of a drug in question is….A. mandelic acidB. paracetamolC. mefenamic acidD. prontosil rubrumE. oleum ricini Which of the following statements is a FALSE statement regarding receptors?A. Not all optical isomers in drugs have the same activityB. To exert a biologic effect, drug molecules do not always have to form complexes with receptorsC. all answers are correctD. drug molecules have biological specificationsE. Drugs have biological activity at low concentrationsWhy is it important to select a good stationary phase? a) To retain the desired molecules and separate them from the rest of the sample b) To create a good flow path through the system ) To detect all the molecules in the sample at the same time d) To ensure the sample remains properly mixed
- Which of the following would be most effective as a buffer? A. pure water B. a mixture of molecules that are bonded to each other with hydrogen bonds C. a mixture of unbonded atoms D. a mixture of molecules with ionic bonds that will break apart into ions E. a mixture of nonpolar moleculesThere are two solutions with different pH levels. Solution A is neutral, with a pH of 7. Solution B is slightly alkaline, with a pH above 7. Two beakers are filled with of each solution (one for each solution). A phosphate buffer was added to it and CO2 was blown into it until there was a change of color meaning a change in pH. (this experiment is to see how the CO2 from the lungs can cause a pH change in water) Why does it take so long for the solutions to change color? Relate your answer to the equation (H2O + CO2 ⇌ H2CO3 ⇌ HCO3- + H+ ) and to the presence of the buffer.in a solution, the solvent is: A) always a gas B) always water C) the substance that is dissovled D) the substance in the Greatest amount
- Acid mine drainage is in part a chemical process and in part abiological process. Discuss the chemistry and microbiologythat lead up to acid mine drainage and point out the keyreactions that are biological. What ways can you think of toprevent acid mine drainage? How might you prevent furthergeneration of acid drainage?Which of the following is FALSE when the concentration of the buffer solution was increased? a. The buffer will be effective in resisting pH changes. b. There will be more weak acid components that can neutralize the added base. c. The solution will have a higher buffer capacity. d. There will be more weak base components that can neutralize the added base.Compound Sodium Lactate is isotonic solution. this mean that it a. reduces movement of sodium across the membrane b.prevent movement of water across the semi permerable cell membrane c. promotes movement of water out of the cell d. facilitates equal movement of water across the semi permerable cell membrane
- Which of the following statements concerning SDS in SDS-PAGE is INCORRECT? a. SDS is a negatively charged detergent b. SDS can give all proteins a uniform charge c. the full name of SDS is sodium dodecyl sulfate d. SDS make protein gel electrophoresis to separate proteins based on molecular weight as well as protein surface charges e. SDS can denature proteinsWhat is the definition of solute concentration? A. The total amount of solute inside a cell B. The total amount of solution inside and outside a cell C. The total amount of solvent in a solution D. The total amount of solute dissolved in a solventThe diffusion of substances within a solution tends to move those substances ________ their ________ gradient. a) up; electrical b) up; electrochemical c) down; pressure d) down; concentration