The cell wall of which of these is not made up of cellulose?

What is the role of smooth endoplasmic reticulum in the liver cells of vertebrate animals?

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

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 cell organelle plays a crucial role in detoxifying many poisons and drugs in a cell?

What are genes? What is their function?