Cell The Unit of Life — BIOLOGY STD 11 Science — Question

Here $A$ and $B$ refer to

$(i)$ 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 endomembrane system.

Of the above statements