Match the following:

Organelle Structure	Description
$(a)$ Cristae	$(i)$ Flat membranous sacs in stroma
$(b)$ Cisternae	$(ii)$ Infoldings in mitochondria
$(c)$ Thylakoids	$(iii)$ Disc-shaped sacs in Golgi apparatus

What is the use of HeLa cells in cell biology?

Cell organelles can be isolated independently by which of the following methods?

Which of the following statements are correct?
$(i)$ In prokaryotic cells,a special membranous structure formed by the extension of the plasma membrane into the cell is known as polysome.
$(ii)$ The smooth endoplasmic reticulum is the major site for synthesis of glycoproteins.
$(iii)$ $RuBisCO$ is the most abundant protein in the whole biosphere.
$(iv)$ Mitochondria,chloroplasts,and peroxisomes are not considered as part of the endomembrane system.

The best material for demonstrating streaming movements of protoplasm within living cells is

Which one of the following is a vital stain?