- AApoenzyme
- ✓Cofactor
- CInorganic catalyst
- DActive site

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$(i)$ 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
$I.$ Myosin head binds to the exposed active site on action to form a cross bridge
$II.$ The Z-line attached to these actin are also pulled in wards there by causing shortening of sarcomere also called contraction
$III.$ This pulls the attached actin filaments towards the centre of $A$-band The correct option is