26

24) Which of the following is true about ribosomes? 
          A) They contain RNA and proteins 
 

B) They synthesize proteins 

C) They are formed on the cytoskeleton 

D) They are found only in the nucleus 

E) A and B 

 
25) The cells that line our respiratory tract, and covering one-celled paramecia  
        both have these hair-like projections.. 
          A) Cilia 
 B) 

Flagella 

 C) 

Microfilaments 

 D) 

Centrioles 

 E) 

Pili 

 
26) Which form of energy is NOT correctly associated with an example? 
          A) Kinetic energy: fat molecules 
 

B) Kinetic energy: movement of molecules 

C) Chemical energy: glucose 

D) Potential energy: water behind a dam 

E) Potential energy: ATP 

 
27) If a reaction results in one molecule losing an electron and a second molecule  
       gaining that electron, the electron donor is said to be 
          A) Reduced 
 B) 

Oxidized 

 C) 

Transformed 

 D) 

Activated 

 E) 

Inhibited 

 
28) Lactose is a disaccharide of glucose and galactose, and its digestion requires  
      the actions of the enzyme lactase to break lactose into monosaccharides. 
      If lactose is eaten as part of the diet but is not digested by lactase, this sugar  
      is then metabolized by bacteria in the intestine, leading to the symptoms of  
      lactose intolerance.  Lactose intolerance, therefore, results from a(n): 

A) Lack of hydrolysis of lactose 

          B) Lack of dehydration synthesis of lactose 
          C) Low blood lactose level 
 

D) Inability of the body to produce lactose 

E) Lack of glucose in the diet 

 
29) Which molecule attaches to pyruvate after glycolysis and before Krebs cycle? 
          A) Lactate 
 B) 

Acetyl-CoA 

C) Citric acid 

 D) 

NADH 

 E) 

Oxygen