A biologist ground up some plant leaf cells and then centrifuged the mixture to fractionate the organelles. Organelles in one of the heavier fractions could produce ATP in the light, whereas organelles in the lighter fraction could produce ATP in the dark. The heavier and lighter fractions are most likely to contain, respectively,

Cells are capable of independent existence and can carry out all the functions which are necessary for the existence of the living being. Some of the functions that are performed by the cell include: Nutrition, Respiration, Excretion, Transportation, Reproduction.