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

The resolving power of an electron microscope is approximately:

Match the following columns correctly.

Column-$I$	Column-$II$
$(a)$ Membrane-bound organelle	$(p)$ Ribosomes
$(b)$ Non-membrane-bound organelle	$(q)$ Mitochondria
$(c)$ Largest cell	$(r)$ Mycoplasma
$(d)$ Smallest cell	$(s)$ Ostrich egg

Adult human $RBCs$ are enucleate. Which of the following statement$(s)$ is/are most appropriate explanation for this feature?
$(1)$ They do not need to reproduce.
$(2)$ They are somatic cells.
$(3)$ They do not metabolise.
$(4)$ All their internal space is available for oxygen transport.

Describe the structure of the following with the help of labelled diagrams.
$(i)$ Nucleus
$(ii)$ Centrosome

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