Cytoplasm: A jelly-like material that contains dissolved nutrients and salts and structures called organelles. It is where many of the chemical reactions happen.Nucleus: Contains genetic material, including DNA, which controls the cell’s activities.Cell membrane: Its structure is permeable to some substances but not to others. It therefore controls the movement of substances in and out of the cell.Mitochondria: Organelles that contain the enzymes for respiration, and where most energy is released in respiration.#Ribosomes: Tiny structures where protein synthesis occurs.