25

18) All of the following are components of modern cell theory EXCEPT: 
          A) All living organisms are made up of one or more cells 
 

B) The smallest living organisms are single cells 

C) All cells arise from preexisting cells 

D) Bacterial cells are eukaryotic 

E) Cells are the functional units of all organisms 

 
19) Which of the following organelles would only be found within a cell that was  
       both eukaryotic and autotrophic? 
 A) 

Mitochondria 

B) Smooth endoplasmic reticulum 

 C) 

Nucleus 

D) Golgi apparatus 

 E) 

Chloroplast 

 
20) Which statement is NOT true about bacteria? 
 

A) Their cell wall is composed of the same material as plant cell walls 

B) Some can move because they have flagella 

C) Some can photosynthesize 

D) They are all prokaryotes 

E) Their cell wall contains peptidoglycan 

 
21) Which of the following statements about the plasma membrane is/are true? 
 

A) It is a solid layer of proteins that protects the contents of the cell 

B) The plasma membrane of the bacterium has none of the same components  

     as the plasma membrane of a eukaryotic cell 

C) It is a rigid and unmoving layer of phospholipids and proteins 

D) It allows selected molecules to pass into and out of the cell 

E) C and D are correct 

 
22) If a living plant were moved from a freshwater aquarium to a saltwater  
       aquarium, which of the following would occur? 
 

A) Nothing – the plant would do equally well in either aquarium 

B) The plant’s cells would lose water 

C) The plant’s cells would lose ions 

D) The plant’s cells would take up water 

E) The plant would gain turgor pressure 

 
23) Which phrase does NOT describe one of the functions of proteins of the  
       plasma/cell membrane? 
 

A) Forming a channel through the membrane 

B) Initiating the replication of genetic material 

C) Binding to a substance to carry it through the membrane 

D) Acting as a receptor for substances outside the cell 

E) Maintaining Na

+

/K

+

 balance in cell