Porins are proteins that form large pores in the outer membranes of which of the following?

Match the following columns and select the correct option.

Column $I$	Column $II$
$(a)$ Smooth endoplasmic reticulum	$(i)$ Protein synthesis
$(b)$ Rough endoplasmic reticulum	$(ii)$ Lipid synthesis
$(c)$ Golgi complex	$(iii)$ Glycosylation
$(d)$ Centriole	$(iv)$ Spindle formation

The resolving power of an electron microscope is approximately:

In an animal cell,protein synthesis occurs in . . . . . . .

Which of the following statements are incorrect?
$(i)$ Plant cells have centrioles which are absent in almost all animal cells.
$(ii)$ Ribosomes are the site of protein synthesis.
$(iii)$ The middle lamella is a layer mainly of calcium carbonate which holds the different neighbouring cells together.
$(iv)$ In animal cells, steroidal hormones are synthesized by smooth endoplasmic reticulum.
Of the above statements:

Match column-$I$ and column-$II$ and select the correct answer.

Column-$I$	Column-$II$
$A$. Bacteria without walls	$I$. Lysosome
$B$. Small circular $DNA$	$II$. Mycoplasma cells
$C$. Flattened sacs in a chloroplast	$III$. Thylakoid
$D$. $A$ vesicle in which hydrolytic enzymes are stored	$IV$. Plasmid