1. Acceleration of impulse
2. Deceleration of impulse
        
                    
             
        
        
        
1. The Cell Wall.
Plants have a cell wall in order to maintain rigidity and stability. Animal cells do not have a cell wall because they have a different structure, which makes them more flexible and able to move around easier.
2. Chloroplasts
Since plants cannot move, they get their energy from the sun. This energy is made inside of the chloroplasts. Animal cells don't have chloroplasts because their energy comes from other organisms.
3. Central Vacuole
The central vacuole provides structure and holds materials and wastes, and also decomposes those wastes. Animal cells don't have a central vacuole because they have lysosomes and normal vacuoles that do the same function.
        
             
        
        
        
Answer: (I hope you can understand this)
                                            
Type of operon:                                   Trp
                                              It’s a repressible operon        
                                                              Lac
                                             It’s an inducible operon.
Environment:     
                                                              Trp
               It’s deactivated when tryptophan is present in the environment.	
                                                              Lac
               It’s activated when lactose is present in the environment.
Repressor protein:
                                                        Trp
                                        It’s activated by tryptophan.	
                                                               Lac
                                            It’s inactivated by lactose.
Transcription:
                                                                Trp
                    Tryptophan binds to the repressor protein, activating it.
                                                                Lac
             Lactose binds to the repressor protein, deactivating it.
Explanation:
Plato