7

29) At the end of glycolysis, the original carbons of the glucose molecule form: 
          A) Six molecules of carbon dioxide 
 

B) Two molecules of NADH 

C) Two molecules of pyruvate 

D) Two molecules of citric acid 

E) Two molecules of fructose 

 
30) The oxygen we breathe in is used in 
 A) 

Glycolysis 

B) Krebs cycle 

C) Electron Transport System 

D) Preparatory Step 

 E) 

Fermentation 

 
31) If a DNA sample contains 13% adenine, what percentage of the sample contains  
       cytosine? 
          A) 13% 
 

B)   0% 

 C) 

37% 

 D) 

26% 

 E) 

74% 

 
32) For the DNA sequence G-C-C-T-A-T in one polynucleotide chain, the sequence  
      found in the other polynucleotide chain must be: 
 A) 

C-G-G-A-T-A. 

           B) G-C-C-A-T-A. 
          C) C-G-G-A-U-A. 
 D) 

A-T-T-C-G-C. 

 E) 

G-C-C-T-A-T. 

 
33) Which of the following are expected to result in genetic variation among  
       offspring? 

          A) Mutations 
 

B) Crossing over 

C) Random assortment of parental chromosomes during meiosis 

D) A and B 

E) A, B, and C 

 
34) For a mutation to affect the evolution of an animal species, it must occur in  
          A) Somatic cells 
 

B) Prokaryotic cells 

 C) 

Gametes 

D) None of the above 

E)  All of the above