According to the RNA word hypothesis, RNA acted as the genetic material and catalyzed reactions in ancient cells. What conclusion can you draw from this? a)This implies that RNA can catalyze any chemical reaction that enzymes catalyze.
b)This implies that DNA and proteins evolved after RNA
c)This implies that DNA and proteins arent essential in cells today.
d)This implies that if a cell has a problem with its DNA, its RNA can compensate for the damaged DNA.

The cell membrane can best be imagined as the gated community of a cell. it controls the flow of substance inside and out of the cell as well separate it from its external environment.
its major components are a phospholipid bilayer which acts as a semi permeable membrane separating the cell from its surrounding and providing a gradient for diffusion and osmosis.
proteins which act as gates and channels for the transport of macro  molecules into and out of the cell as well provide energy for facilitated diffusion or active transport via atp bound proteins.