Which of the following lacks cell wall?

Cell wall is a characteristic feature to cells of plants, bacteria, fungi, algae and some archaea. It is located outside the cell membrane. The major function of the cell wall is to provide rigidity, tensile strength, structural support, protection against mechanical stress and infection. It also help in diffusion of gases in and out of the cell. Gametes, Amoeba and Mycoplasma lack cell wall.