What did NAD+ help do in reactions? (Pick ALL the correct possible answers) Select one or more: a. NAD+ acts as a coenzyme helping to work with an enzyme to create a reaction b. NAD+ is a made from Niacin (Vitamin B3), this is part of the reason why the B complex of vitamins helps you produce energy c. NAD+ removes hydrogen from other molecules d. NAD+ adds hydrogen to other molecules e. NAD+ helped to detoxify cells of ethanol by removing hydrogen making acetaldehyde and acetyl-COA

You have a reaction that takes 8 hours to reach completion at 20 degrees celcius. What is the likely result of changing the temperature to 30 degrees celcius?  a. the reaction should take less times  b. reaction time would be unaffected  c. the reaction should take more time  Which would be the correct answer to this question?

How does an enzyme affect a chemical reaction? Select all that apply.     A. Lowers the activation energy   B. Decreases the rate of the reaction   C. Increases the activation energy   D. Increases the rate of the reaction

It makes sense that enzymes should be active when they are needed and inactive when they are not needed. Non-competitive (allosteric) regulation of enzymes is important in metabolism because it allows for the rapid adjustment of their activity.  Recall hexokinase, a key enzyme of glycolysis. Which of the following molecules likely functions as an allosteric inhibitor of its activity?      A.  ADP  B.  Glucose  C.  NAD+  D.  Pyruvate