A cell is made up of different structures
They form memory cells in which those cells remember the same pathogen for faster antibody production, in aid of future infections.
Structure A is used for (4) cell communication. The cell membrance has receptros for cell communcation.
Structure B is used to (1) extract energy from nutrients. The mitochondria is the power house of the cell.
Structure C is used for (1) protein synthesis. The golgi apparatus is where protein is created.