What is the full form of $RNA$ and $DNA$?

Write true or false for the following statement:
The endoplasmic reticulum is a large network of membrane-bound tubes and sheets.

If cells of onion peel and $RBC$ are separately kept in a hypotonic solution,what among the following will take place? Explain the reason for your answer.
$(a)$ Both the cells will swell.
$(b)$ $RBC$ will burst easily while cells of onion peel will resist the bursting to some extent.
$(c)$ Both $(a)$ and $(b)$ are correct.
$(d)$ $RBC$ and onion peel cells will behave similarly.

Which part of the cell is called the brain of the cell?

Define the following terms:
$(i)$ Endocytosis
$(ii)$ Phagocytosis
$(iii)$ Exocytosis

Lysosomes arise from: