Question 1 What is cell membrane? Question 2 What is the function of cytoplasm? Question 3 What is protoplasm? Question 4 What are the functions of cell membrane? Question 5 What controls the flow of substances in and out of a cell? Cell membrane and cytoplasm Cell membrane Every cell is covered by a thin sheet of skin which is called cell membrane or … [Read more...] about Cell membrane and Cytoplasm