Except for bacteria,what do all cells contain within their cell membrane?

In a compound microscope,the magnification is $NOT$ consistent with which of the following?

Which of the following cell organelles is not considered as a part of an endomembrane system?

Match the items given in column-$I$ with their role given in column-$II$ and choose the correct option.

Column-$I$	Column-$II$
$A$. $SER$	$I$. Increase the surface area
$B$. Golgi apparatus	$II$. Store oils or fats
$C$. Cristae	$III$. Excretion
$D$. Peroxisome	$IV$. Photorespiration
$E$. Elaioplasts	$V$. Synthesis of lipid

Match column $I$ (cell type) with column $II$ (size) and choose the correct option.

Column-$I$ (Cell type)	Column-$II$ (Size)
$A$. Viruses	$I$. $1-2 \; \mu m$
$B$. $PPLO$	$II$. $10-20 \; \mu m$
$C$. Eukaryotic cell	$III$. About $0.1 \; \mu m$
$D$. Bacterium	$IV$. $0.02-0.2 \; \mu m$

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.