I'm not sure what you're asking, but if you're looking for a word to describe this change its "mutation" 
        
             
        
        
        
Answer:
ZBWCYAX
Explanation:
Equation for the intermediates: Z↔W↔Y↔X
1) B catalyzes the breakdown of Z, therefore inhibiting B leads to the build up of Z.
2) If enzyme C is inactive then the organism will not  receive Y to grow, thus Y is a by-product of C.
3) If A is inhibited then W, Y and Z build except for X, thus it make sense that A catalyzes a reaction that leads to X as a by-product.
4) Inhibiting C leads to the reaction toward making Z and W, thus it catalyzes the breakdown of C directly and Z indirectly. 
 
        
             
        
        
        
The answer to your question is Letter C   <-- ANSWER 
Steroid is a molecule made up of four carbon rings with other atoms bonded to those rings. 
Hope this Helps 
 
        
                    
             
        
        
        
Think about skin cells. Skin cells shed every day, if cell division didn't take place, you would just constantly be losing skin cells.
 
        
             
        
        
        
Answer:
Glucose 
Explanation:
Glucose is produced during photosynthesis and it is oxidised during cellular respiration to produce ATP energy.