5 Written questions
5 Matching questions
- An enzyme is a globular protein that inhibits the formation of chemical bonds within the enzyme's substrate(s).
- A coenzyme is
A. an ionic cofactor that interacts with an enzyme to allow it to work.
B. a protein cofactor that interacts with an enzyme to allow it to work.
C. a nonprotein organic cofactor that interacts with an enzyme to allow it to work.
D. an ionic cofactor that interacts with an enzyme to inhibit it.
E. a protein cofactor that interacts with an enzyme to inhibit it.
In this reaction, the reactant (s) are _____________ and the coenzyme NAD is ____________.
A. reduced; oxidized
B. oxidized; oxidized
C. reduced; reduced
D. oxidized; reduced
- The subunits from which ATP is made are:
A. ADP and phosphate.
B. FAD and NAD+.
C. FAD and NADPH.
D. ADP and FAD.
E. ADP and NAD+.
- Which of the following is NOT a form of potential energy?
B. water in a dam
C. a muscle contracting
D. All of the choices are not potential energy.
- a C. a nonprotein organic cofactor that interacts with an enzyme to allow it to work.
- b D. oxidized; reduced
- c C. a muscle contracting
- d False
- e A. ADP and phosphate.
5 Multiple choice questions
- E. metabolism.
- B. Reactions that occur spontaneously are those that increase the amount of useful energy in a system.
- C. Hydrogen ions are pumped across the membrane by carrier proteins of the electron transport chain.
- E. are about twelve enzymes, at least one responsible for each step in the metabolic pathway.
5 True/False questions
Which statement is NOT true about enzyme inhibition?
A. In competitive inhibition, the inhibitor binds to the active site of the enzyme.
B. In noncompetitive inhibition, the inhibitor binds to the allosteric site of the substrate.
C. In irreversible inhibition, a poison binds to the enzyme so that it can never work again.
D. Most inhibitors act in a reversible fashion.
E. All of the statements are true. → E. All of the statements are true.
A living organism represents stored energy in the form of chemical compounds. When an organism dies, what happens to this stored energy?
A. All chemicals immediately lose their high-energy bonds.
B. All molecules immediately degrade into basic elements.
C. All energy immediately leaves, and that is one manifestation that the organism is dead.
D. The chemical compounds in cells lose their organization over time because there is no longer an input of energy to maintain the organized state.
E. The chemical compounds remain exactly intact and ready to start up again unless digested by a consumer or decay organism. → D. The chemical compounds in cells lose their organization over time because there is no longer an input of energy to maintain the organized state.
The metabolic pathway at right involves how many possible chemical reactions?
D. three → B. endergonic
While eating a container of yogurt, you have to leave, so you store the yogurt in the refrigerator. A day later you return and find the surface of the yogurt is no longer smooth but has broken into several liquified products. You correctly guess that enzymes from your saliva, via the spoon, have continued digesting the yogurt in your absence. What will happen over time?
A. The reaction will soon stop because the amount of saliva is small, and you would have to add more saliva to continue the degradation.
B. The reaction will continue, since the enzyme is not consumed by the reaction.
C. The reaction will continue until half is digested and then stop because the reaction between substrate and product will be balanced.
D. Absolutely no degradation of the yogurt will occur naturally unless in the presence of this enzyme. → B. The reaction will continue, since the enzyme is not consumed by the reaction.
Of the following, which process will not denature a protein?
A. heating to temperatures above 100 C
B. addition of strong acids or strong bases
D. addition of distilled water → C. a muscle contracting