In the given figure,what do the parts labeled '$a$' and '$b$' represent respectively?

Microsomes are obtained by . . . . . . .

Which of the following are $NOT$ considered as the part of endomembrane system?
$A$. Mitochondria $B$. Endoplasmic reticulum $C$. Chloroplasts
$D$. Golgi complex $E$. Peroxisomes
Choose the most appropriate answer from the options given below:

What is the resolving power of a microscope?

Identify the components labelled $A, B, C$ and $D$ in the diagram below from the list $(i)$ to $(viii)$ given along with:
Components:
$(i)$ Cristae of mitochondria
$(ii)$ Inner membrane of mitochondria
$(iii)$ Cytoplasm
$(iv)$ Smooth endoplasmic reticulum
$(v)$ Rough endoplasmic reticulum
$(vi)$ Mitochondrial matrix
$(vii)$ Cell vacuole
$(viii)$ Nucleus
The correct components are:

Which of the following is not a cell organelle?