Biology 20

Take Home Lecture Quiz #4

Bioenergetics/Enzymes

 

Due: Monday, 18 Oct 10 @ 900 AM

 

IQ Test: please put your name and your lab day and time (M or W)

 

1.       Glucose molecules provide energy to power the swimming motion of sperm.  In this example, the sperm are changing:

        a) chemical energy into kinetic energy;         b) chemical energy into potential energy;

        c) kinetic energy into potential energy;          d) kinetic energy into chemical energy.

 

2.       Oxidation is the                      , where as reduction is the                    .

        a) gain of electrons ... loss of electrons;        b) loss of electrons ... gain of electrons;

        c) loss of oxygen ... gain of oxygen;                     d) gain of oxygen ... loss of oxygen.

 

3.       When an enzyme catalyzes a reaction; it?

        a) lowers the amount of energy that is required to get the reaction going;

        b) raises the amount of energy that is required to get the reaction going;

        c) becomes the product of the reaction;

        d) acts as the reactant.

 

4.       After you have broken down your breakfast items into simpler products.  The chemical reactions that result in the building of more complex molecules are referred to as                            reactions.

       a) anabolic;            b) catabolic;           c) dehydration;               d) none of these.

 

5.       Three or four of the following statements concerning enzymes are true and correct. Which one, if any, is NOT correct? If all the statements are correct, choose "All of the above."

       a) An enzyme is not consumed by the catalytic process;

       b) An enzyme is very specific in terms of which substrates it can bind to;

       c) An enzyme lowers the activation energy of a chemical reaction

       d) all of these are correct statements regarding enzymes.

 

6.       Which of these statements about enzyme inhibitors is true?

       a) A competitive inhibitor binds to the enzyme outside the active site;

       b) the action of competitive inhibitors may be reversible or irreversible;

       c) A noncompetitive inhibitor does not change the shape of the active site;

       d) When the product of an enzyme or an enzyme sequence acts as its inhibitor, this is known as positive feedback;

       e) Antibiotics and pesticides generally do not act on enzymes, but rather affect the genetic code of their victims.

 

7.       A reaction is designated as exergonic rather than endergonic when ___________.

       a) activation energy exceeds net energy release;

       b) activation energy is necessary;

       c) no kinetic energy is released;

       d) the potential energy of the products is less than the potential energy of the reactants;

       e) it absorbs more energy.

 

8.       The first law of thermodynamics ____________.

       a) states that energy is neither created not destroyed;         b) deals with entropy;    c) deals with heat content;

       d) states that entropy spontaneously increases;                  e) predicts the direction of a reaction.

 

9.       Which of these is exhibiting kinetic energy?

       a) a rock on a mountain ledge;       b) the high energy phosphate bonds of ATP;  c) an archer with a flexed bow;

       d) a space station orbiting Earth;    e) a person sitting on a couch while watching TV.

 

10.   Which of the following do enzymes work on?

       a) substrates;         b) products;            c) inhibitors;           d) competitive inhibitors;         e) dynamite.