Rough Endoplasmic Reticulum (RER) - synthesizes proteins constituting cell membrane.
Smooth Endoplasmic Reticulum (SER) - synthesizes lipids constituting cell membrane.
∆ABC is an isosceles triangle in which AB = AC. Side BA is produced to D such that AD = AB (see Fig. 7.34). Show that ∠ BCD is a right angle.

Read More: Fundamental Unit of Life: Cell
The different parts of a cell and their functions are as follows:
