The answer is A The amino acid inactivates the repressor
        
             
        
        
        
The answer is A, Thalamus. 
 
        
             
        
        
        
The category is just called plants
 
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Answer:
Spindle fibers form a protein structure that divides the genetic material in a cell. The spindle is necessary to equally divide the chromosomes in a parental cell into two daughter cells during both types of nuclear division: mitosis and meiosis. During mitosis, the spindle fibers are called the mitotic spindle.
Explanation:
 
        
             
        
        
        
Answer:
Messenger RNA (mRNA), molecule in cells that carries codes from the DNA in the nucleus to the sites of protein synthesis in the cytoplasm (the ribosomes).