Answer:
Repressor protein
Explanation:
Repressor is a protein that binds to deoxyribonucleic acid(DNA) or ribonucleic acid(RNA) it inhibits the expression of one or more genes which is done by binding to the associated silencers. 
A DNA binding repressor works by blocking the attachment of RNA polymerase an enzyme that enhance transcription to the promoter, thus preventing genes from been transcribed into messenger RNA.
 An RNA binding repressor binds to the messenger RNA and prevents translation of the bases on the messenger RNA into protein. The blocking of expression is called repression.
 
        
             
        
        
        
Answer:The Earth moves in several ways. First, it turns around its polar axis; one turn takes 24 hours. Then it moves along its orbit around the Sun; one full revolution takes 1 year. And third, its polar axis changes direction very slowly, just like a spinning top
Explanation: hope this helps
 
        
                    
             
        
        
        
Answer:
D is likely to cause both false positives and false negatives
 
        
             
        
        
        
Anime1life can you list the options so I can refresh my memory and list the correct answer for you.