Explanation:
Single lensed Microscope for observing bacteria and protozoan
 
        
                    
             
        
        
        
Answer: A double restriction digest 
Explanation: A double restriction digest is a process were two restriction enzymes are used to digest DNA in a single reaction.in double restriction digest you will observe two bands,while in single restriction digest you will observe just one band. In double restriction digest no 
Self - ligating plasmid because it create mismatch ends. It also aids in directional in section while single disgestion you have to screen your clones to be sure to get your plasmid with correct insert orientation.
 
        
             
        
        
        
I believe it is scientific laws.
        
             
        
        
        
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