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5 Written questions

5 Matching questions

  1. While science is not yet able to describe the phenomenon of "thinking" in physical terms, we can be certain that it is a process involving the metabolism of brain cells. With positron emission tomography (PET scan) it is possible to inject short-lived isotopes and image the regions of the brain that have the most active metabolism during various mental activities. For different mental functions, different regions and amounts of nerve cells become active. However,
    A. the cellular energy expended in "thinking" must be less than the chemical bond energy supplied in food to these brain cells.
    B. "thought" cannot be linked to cell processes because energy is not related to matter.
    C. since thoughts can occur over and over, the requirement for a continual input of energy to prevent entropy does not apply to this cell activity.
    D. "thinking" is beyond the scope of science to study.
  2. Which best describes the second law of thermodynamics?
    A. Energy is not created nor destroyed, but it can change into matter.
    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.
  3. 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.
  4. 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
  5. Which of the following is consistent with the laws of physics governing energy?
    A. When a liter of gasoline is burned in a car engine, 100% of its energy goes into moving the car along the road.
    B. You eat a "quarter-pounder" hamburger and assemble exactly a quarter-pound of additional body weight on your body.
    C. Eventually sunlight that is absorbed on the earth returns to space as dispersed heat.
    D. A calorie of sunlight becomes a calorie of plant tissue that, eaten by you, becomes a calorie of heat lost in muscle "power."
    E. Chemical bonds are a case of converting energy to matter; breaking the bonds converts matter to energy.
  1. a C. Eventually sunlight that is absorbed on the earth returns to space as dispersed heat.
  2. b D. Some useful energy is lost as heat whenever an energy transfer occurs.
  3. c A. the cellular energy expended in "thinking" must be less than the chemical bond energy supplied in food to these brain cells.
  4. d B. Energy is not created nor destroyed, but it can change from one energy form to another.
  5. e A. kinetic energy: fat molecules

5 Multiple choice questions

  1. B.http://www.flickr.com/photos/60296733@N06/5514033968/
  2. C. a nonprotein organic cofactor that interacts with an enzyme to allow it to work.
  3. A. ADP and phosphate.
  4. B. Reactions that occur spontaneously are those that increase the amount of useful energy in a system.
  5. D. As the substrate binds to the enzyme, the shape of the active site changes to accommodate the reaction.

5 True/False questions

  1. 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.
    D. An enzyme's activity is generally reduced by an increase in substrate concentration.

          

  2. 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
    C. phosphorylation
    D. addition of distilled water
    C. a muscle contracting

          

  3. 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
    B. The reaction will continue, since the enzyme is not consumed by the reaction.

          

  4. 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.
    False

          

  5. Endergonic reactions:
    A. release energy.
    B. have a negative ΔG and occur spontaneously.
    C. can only occur if there is an input of energy.
    D. have products with less free energy than the reactants.
    E. All of the choices are correct.
    C. can only occur if there is an input of energy.

          

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