$RNA$ is absent in

Considering the fluid mosaic model of the plasma membrane,which of the following statements is true regarding the movement of lipids and proteins from one monolayer to the other? (The movement is described as flip-flop.)

Desmosomes are associated with which of the following?

The plant cell cytoplasm is surrounded by both cell wall and cell membrane. The specificity of transport of substances is mostly across the cell membrane,because $..........$

Given below are two statements.
Statement-$I$: Cell wall is freely permeable.
Statement-$II$: Plasma membrane is selectively permeable.
Choose the correct answer from the options given below with reference to the structure of root hair.

The thickness of the plasma membrane is: