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

Lipid molecules in the cell are synthesized by

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.

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

What is the chemical composition of the cell wall in plants and fungi,respectively?

State the reason for the following:
$(i)$ Mitochondria are known as the powerhouse of the cell.
$(ii)$ Plastids are able to make their own protein.
$(iii)$ Plant cells shrink when kept in a hypertonic solution.