Identify the correct sequence starting from the synthesis of protein to its transportation and packaging.

$i.$ The shape of the cells may vary with the function they perform.
$ii.$ Human $RBC$ is about $7.0 \, \mu m$ in diameter.
$iii.$ Cytoplasm is the main arena of cellular activities.
$iv.$ Various chemical reactions occur in cytoplasm to keep the cell in the living state.

The source of light in an electron microscope is .......

Name two cell-organelles that are double membrane-bound. What are the characteristics of these two organelles? State their functions and draw labelled diagrams of both.

The invention of the electron microscope led to a major breakthrough in the study of cells. What could be the reason for this?

Match List $- I$ with List $- II.$

List $- I$	List $- II$
$A$. Centromere	$I$. Mitochondrion
$B$. Cilium	$II$. Cell division
$C$. Cristae	$III$. Cell movement
$D$. Cell membrane	$IV$. Phospholipid Bilayer

Choose the correct answer from the options given below: