Name:                                                                                .                 2003 10 28

 

Read questions carefully. Attempt all questions as no marks will be deducted for incorrect responses.

The value of each question is one mark unless otherwise specified.     TOTAL   10K

 

 

1.  An electron carrier acts as an energy storage molecule when it is __________ (for example, __________).

 

A. oxidized ... NADH                C. reduced ... NAD⁺

B. reduced ... NADH                D. oxidized ... NAD⁺

 

2.  Of the metabolic pathways listed below, the only pathway found in all organisms is         .

 

            A. fermentation.                        C. electron transport chain.

            B. glycolysis.                             D. cellular respiration.

 

3.  The primary function of fermentation is to        .

 

A.   regenerate NAD⁺                    C.   provide alcohol to students

B.   produce NADH                  D.   reduce pyruvate

 

4.  Substrate-level phosphorylation requires       .

 

A.  an enzyme, a phosphorylated intermediate and ADP

B.  an energy source and protons

C.  an enzyme, ADP and phosphate

D.  oxygen, electron transfer chain and protons

 

5.  Which of the following describes glycolysis?

           

A.  It begins the oxidation of glucose.

B.  It produces a small amount of ATP.

C.  It generates NADH.

D.  It splits glucose to form two molecules of pyruvate.

E.  All of the above.

 

6.  When pyruvate is converted to acetyl CoA ___________.

                   

A. CO₂ and Coenzyme A are formed

 

B. CO₂ and NADH are formed

 

C. CO₂ and ATP are formed

 

D. NAD⁺ is regenerated

 

7.  The Krebs cycle (citric acid cycle) takes place in the          .

 

 A.    cytoplasm.           C.  mitochondrion.

 B.     nucleus.               D.  Golgi complex.

 

8.  Muscle tissues make lactate from pyruvate in order to . . .

                   

A. enable you to get drunk.                    C. regenerate NAD⁺.

B. utilize the energy in pyruvate.             D. get rid of toxic pyruvate.

9.  The net gain of ATP for each glucose molecule that enters glycolysis is, in the absence of oxygen, approximately _____.

           

            A.  38               B.  4                 C.  2                 D.  36 A

 

10.  To prepare a molecule of glucose for cleavage, it requires

           

            A. 2 molecules of oxygen                       C. two molecules of carbon dioxide

            B. 2 molecules of ATP                          D. two molecules of G3P

 

BONUS (1)

Give the number of carbon atoms found in the following compounds

 

Glucose     6       .                      Lactate     3      .

 

G3P      3          .                       Ethanol (ethyl alcohol)   2          .