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5 Written questions

5 Matching questions

  1. Which statement describes the currently accepted theory of how an enzyme and its substrate fit together?
    A. As the product is released, the enzyme breaks down.
    B. The enzyme is like a key that fits into the substrate, which is like a lock.
    C. The active site is permanently changed by its interaction with the substrate.
    D. As the substrate binds to the enzyme, the shape of the active site changes to accommodate the reaction.
  2. Which statement is NOT true about the effects of various conditions on the activity of an enzyme?
    A. Higher temperatures generally increase the activity of an enzyme up to a point.
    B. Above a certain range of temperatures, the protein of an enzyme is denatured.
    C. A change in pH can cause an enzyme to be inactivated.
    D. An enzyme's activity is generally reduced by an increase in substrate concentration.
    E. When sufficient substrate is available, the active site will nearly always be occupied.
  3. 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.
  4. All of the biochemical pathways in a cell constitute
    A. coupling reactions.
    B. free energy.
    C. endergonic reactions only.
    D. exergonic reactions only.
    E. metabolism.
  5. ATP is considered a high-energy compound because under cellular conditions, 7.3 kcal per mole of energy is released when a bond is broken between:
    A. the base adenine and the sugar ribose.
    B. the adenosine and the phosphate groups.
    C. the base adenine and the phosphate groups.
    D. the adenosine diphosphate and the third phosphate.
    E. All of the bonds release energy as ATP is completely broken down.
  1. a E. metabolism.
  2. b D. the adenosine diphosphate and the third phosphate.
  3. c D. An enzyme's activity is generally reduced by an increase in substrate concentration.
  4. d D. As the substrate binds to the enzyme, the shape of the active site changes to accommodate the reaction.
  5. e C. a nonprotein organic cofactor that interacts with an enzyme to allow it to work.

5 Multiple choice questions

  1. D. All of the choices are true.
  2. 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.
  3. A. kinetic energy: fat molecules
  4. D. oxidized; reduced
  5. B. Mitochondria and chloroplasts.

5 True/False questions

  1. http://www.flickr.com/photos/60296733@N06/5513326151/?edited=1
    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.

          

  2. 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.

          

  3. An enzyme is a globular protein that inhibits the formation of chemical bonds within the enzyme's substrate(s).
    True False
    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.

          

  4. What establishes the electrochemical gradient across a membrane to provide energy for ATP production?
    A. The chloroplast's electron transport system provides the ions.
    B. Hydrogen ions naturally collect on the outside of the organelle membrane.
    C. Hydrogen ions are pumped across the membrane by carrier proteins of the electron transport chain.
    D. All of the choices establish the electrochemical gradient.
    C. Hydrogen ions are pumped across the membrane by carrier proteins of the electron transport chain.

          

  5. 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.
    True False
    True