The correct answer will be the second one Growth of a tumor
A and C
They both can be compared to present or past objects to show how they have changed or evolved over time
An impulse relayed along a myelinated axon jumps from node of Ranvier to node of Ranvier.
The lac repressor protein is bound to the operator region of the lac operon when there is no lactose in the medium. When introduced in lactose, it binds to an allosteric site on the repressor causing its to change conformation and release from the operator. This allows the polymerase that is bound to the promoter region to proceed transcription of the lac operon genes (LacZ, Lac A, and Lac Y). Translation of these genes forms enzymes that enable the organism to break down lactose for energy.