WGU Biochemistry PA Questions and Answers 100% Passed

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WGU Biochemistry PA Questions and Answers 100% Passed A commonly used technique for protein denaturation is adding an acid or a base to dramatically change the pH. Which force is most impacted by t... his change in pH? Correct Answer- Ionic bonds Acetylcholine is broken down to acetate and choline by an enzyme called acetylcholinesterase. Low levels of acetylcholine in the brain is associated with neurodegenerative disease. Which of the following medications could be used to treat neurodegeneration associated with low acetylcholine levels? Correct Answer- A non-competitive inhibitor of acetylcholinesterase. An active elderly patient is becoming frequently disoriented, having trouble recalling her daily routine, and becoming aggravated easily. She forgets words and places and has difficulty recognizing her children. Which biochemical event is responsible for this patient's behavior? Correct Answer- Protein aggregation An active elderly patient is becoming frequently disoriented, having trouble recalling her daily routine, and becoming aggravated easily. She forgets words and places and has difficulty recognizing her children. Which biochemical event is responsible for this patient's behavior? Correct Answer- Protein aggregation Approximately how many ATP molecules can be produced from a single molecule of glucose during aerobic metabolism? Correct Answer- 30 Assuming 100% reaction efficiency, how many DNA copies are created after the completion of four complete PCR cycles? Correct Answer- 16 Assuming 100% reaction efficiency, how many DNA copies are created after the completion of four complete PCR cycles? Correct Answer- 16At low O 2 concentrations, how does myoglobin's affinity for O 2 relate to hemoglobin's affinity for O 2? Correct Answer- Myoglobin has a much greater affinity for O 2 than hemoglobin does. Frying an egg changes the egg white from a clear liquid to an opaque solid. Which molecular change in the albumin protein causes this change in appearance? Correct Answer- Hydrophobic interactions form between denatured egg white proteins. How do the rates of enzyme-catalyzed reactions compare to those of corresponding uncatalyzed reactions? Correct Answer- They are 10 6 to 10 12 times faster. How does heating beyond optimum temperature inactivate enzymes? Correct Answer- By breaking the covalent bonds in the primary structure How does hemoglobin keep blood pH neutral during exercise? Correct Answer- Deoxygenated hemoglobin binds to excess H +. How does insulin impact carbohydrate metabolism? Correct Answer- It stimulates the uptake of glucose from the blood by cells in the body. How does insulin reduce blood glucose levels? Correct Answer- It increases the translocation of GluT4 transporters to the cell membrane. How does pH level promote the deoxygenated conformation of hemoglobin? Correct AnswerWhen pH lowers, excess H + binds to negatively charged side chains on hemoglobin and changes ionic bonds between subunits to favor the T-state How does the Bohr effect describe the relationship between carbon dioxide levels, blood pH and the amount of oxygen bound to hemoglobin? Correct Answer- An increase in carbon dioxide production leads to a decrease in blood pH, causing hemoglobin to release oxygen more readily. [Show More]

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