University of Central Florida FIL 1000 CH 15 quiz 1)"Oxidation" refers to Select one: a

University of Central Florida

FIL 1000

CH 15 quiz

1)"Oxidation" refers to Select one:

a.            the loss of oxygen.

b.            the gain of oxygen. c. the loss of electrons.

d. the gain of electrons.

2.            A biological reaction with a significantly positive ΔG under cellular conditions may proceed in the forward direction because

Select one:

a.            The cell will change the concentrations of the substrates and products so that the reaction can occur

b.            The cell will raise the temperature, thereby affecting the overall thermodynamics of the reaction.

c.             the reaction can be coupled to a reaction with a more significant negative ΔG.

d.            reactions with positive ΔG values always proceed in the forward direction.

e.            None of these

3.            An isolated system can exchange             with its surroundings Select one:

a.            energy but not matter

b.            matter but not energy

c.             both matter and energy d. neither matter nor energy

4.            ATP is a good source of energy to run metabolic reactions for all the following reasons, except:

Select one:

a.            The pyrophosphate bond has a high energy of hydrolysis. b. The sugar group is very reactive.

c.             The bonds between the phosphates are acid anhydrides.

d.            The phosphate groups can combine readily with other molecules.

e.            All of these explain why ATP is a good energy source.

5.            Consider these reactions:

ATP → ADP + Pi ΔG°' = −31 kJ/mol

glucose-6-phosphate → glucose + Pi       ΔG°' = −13 kJ/mol glucose + ATP → glucose-6-phosphate + ADP ΔG°' = ?

What is the ΔG°' of the last reaction? Select one:

a.            −44 kJ/mol b. −18 kJ/mol

c. +18 kJ/mol

d. +44 kJ/mol

e. Cannot be determined from the information provided.

6.            In biological redox reactions, hydrogen ions are usually transferred along with electrons. Select one:

a.            True

b.            False

7.            In general, catabolism Select one:

a.            releases energy.

b.            absorbs energy.

c.             neither absorbs nor releases energy.

8.            In metabolism the term "activation" refers to Select one:

a.            conversion of a component of a metabolic pathway into a reactive compound.

b.            addition of a catalyst.

c.             bypassing endergonic reactions in a pathway.

d.            bypassing the unreactive components of a pathway.

9.            In the coenzyme FAD the site to which electrons are transferred is Select one:

a.            the ribose moiety of the molecule

b.            a purine ring system

c.             a pyrimidine ring system

d.            a nitrogen-containing ring system

10.          Spontaneous reaction always occurs at a relatively fast rate. Select one:

a. True b. False