5 Written questions
3 Matching questions
- Energy coupling of endergonic and exergonic reactions within cells
A. permits biological reactions to proceed at temperatures consistent with life.
B. uses heat released by one reaction to fuel the other reaction.
C. utilizes ATP to carry energy between the exergonic and endergonic reactions.
D. All of the choices are correct.
- Lactose is milk sugar, and humans produce substantial lactase enzyme to digest it when we are infants. However, we soon lose some or even all of our lactase after childhood. In such cases, undigested lactose passes to the lower intestine where bacteria break it down into lactic acid and CO2, causing painful gas bloating. This problem could be avoided by
A. avoiding all dairy products containing lactose.
B. taking lactase enzyme tablets when consuming lactose products.
C. taking any enzyme tablets when consuming dairy products.
D. consuming lactose in tablet form.
E. Both taking lactase enzyme and avoiding all dairy products would be correct.
- In order to roll a rock down a hillside, you must first push it up out of the hole in which it rests. Pushing the rock is analogous to the energy of activation of a chemical reaction.
- a True
- b D. All of the choices are correct.
- c E. Both taking lactase enzyme and avoiding all dairy products would be correct.
5 Multiple choice questions
- B. ADP ATP is endergonic and B C is exergonic.
- B. Second Law of Thermodynamics.
- D. All of the choices are correct.
- A. have increased greatly.
- D. As the substrate binds to the enzyme, the shape of the active site changes to accommodate the reaction.
5 True/False questions
Which of the following labels is incorrectly identified.
A. A refers to the products.
B. B refers to the substrate-enzyme complex.
C. C refers to the reactants.
D. D refers to the product. → D. D refers to the product.
Which form of energy is NOT correctly associated with the related example?
A. kinetic energy: fat molecules
B. kinetic energy: movement of muscles
C. chemical energy: glucose
D. potential energy: water held behind a dam
E. potential energy: ATP → B. Reactions that occur spontaneously are those that increase the amount of useful energy in a system.
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.
Which best describes the first law of thermodynamics?
A. Energy is changed from one form to another with a loss of usable energy.
B. Energy is not created nor destroyed, but it can change from one energy form to another.
C. Energy can be created from matter or used to produce matter.
D. Some useful energy is lost as heat whenever an energy transfer occurs.
E. Energy transfers are always 100% efficient in changing energy from one useful form to another. → D. Some useful energy is lost as heat whenever an energy transfer occurs.
Coupling occurs when the energy released by an exergonic reaction is:
A. used to drive another exergonic reaction.
B. used to drive an endergonic reaction.
C. lost as nonusable heat to the environment.
D. used to decrease the entropy of the universe.
E. All of the choices are correct. → B. used to drive an endergonic reaction.