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Review 2: Answer Key on page 21 

Select the correct answer. 

1) A primary source of scientific results is ___ 
 

A) The news media 

B) Anecdotes from others 

C) Articles in peer- reviewed journals 

D) The internet 

E) All of the above 

 
2) A guess in a scientific process is called __; a unifying explanation for a range of  
     observations is termed___? 
 A) 

Theory: 

Hypothesis 

 B) 

Theory: 

Experiment 

C) Hypothesis: Control 

D) Hypothesis: Theory 

E) Experiment: Theory 

 
3) To test the effect of vitamin D on growth, two groups of rats were raised under   
      identical conditions and fed the same diet. One of the groups received daily  
      injections of vitamin D. The other group received injections of saline, which did  
      not contain vitamin D. All the rats were weighed weekly for 2 months. In this  
      experiment, the control was the: 
 

A) Group receiving vitamin D. 

B) Group receiving saline. 

C) Average weight gain of the rats. 

D) 2-month period of time. 

E) The diet the rats ate 

 
4) Which of the following are both universal characteristics of life? 
 

A) The ability to grow and the ability to reproduce using DNA 

B) The ability to reproduce using DNA and the ability to capture energy  

               from the sun 
 

C) The ability to move and the ability to sense the environment 

D) The ability to grow and the ability to think 

E) The ability to reproduce and the ability to sleep 

 
5) Which of the following levels of organization is the most inclusive?  
          A) Organism 
 B) 

Population 

 C) 

Biosphere 

 D) 

Community 

 E) 

Ecosystem