The producers are the main source of the food production in the ecosystem. The producers are the organism, which convert the energy from the sunlight into the chemical energy. The consumers use this chemical energy for carrying out the metabolic processes in their body. 
Without producers, the consumers cannot obtain their energy. Hence, the ecosystem without any producer would not survive. 
 
        
             
        
        
        
And enzyme is a large protein molecule.
        
                    
             
        
        
        
he was shocked by the static electricity he had accumulated.
 
        
             
        
        
        
C bc the key word is replaced
        
             
        
        
        
If you used a full active virus, that defeats the point of a vaccine. You will trigger your immune response, but since you would just be injecting the virus, it will make you sick, and your body will be less effective at fighting the pathogens. 
Viruses in vaccines are weakened, so they essentially will not "fight" back. They most importantly just contains the antigen markers so the body can trigger the immune response, quickly eradicate the pathogen, and build up the memory cells to that virus. 
Injecting a virus that is not weak will just be the same thing as if you got the virus, you will likely get sick.