In which of the following are porins found?

Which of the following pairs of organelles does not contain $DNA$?

Which of the following terms is $NOT$ correctly matched with its feature?

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

Which one of the following is a vital stain?

Choose the correct statements regarding cell organelles and their inclusions.
$A$. The endomembrane system includes Golgi complex, endoplasmic reticulum and mitochondria.
$B$. Rough endoplasmic reticulum bears ribosomes on its surface.
$C$. Both mitochondria and plastids have circular $DNA$.
$D$. $A$ network of microtubules, microfilaments and intermediate filaments present in the cytoplasm is called cytoskeleton.
$E$. Mitochondrion is a single membrane-bound structure.
Choose the correct answer from the options given below: