In the following,which is not common for chloroplasts and mitochondria?

$S$ - Statement: The nucleolus is the regulatory center for various activities occurring in the cell.
$R$ - Reason: Rudolf Virchow coined the term 'cell'.

Cytoplasmic streaming movement is the characteristic of

Which one of the following is a vital stain?

Which one of the following is not considered as a part of the endomembrane system?

Consider the following statements and choose the incorrect option:
$a$. Large and more numerous nucleoli are present in cells actively carrying out protein synthesis.
$b$. Nuclear pores allow bidirectional movement of molecules.
$c$. Cytoskeleton is a glycolipid structure for mechanical support,motility and maintenance of the shape of the cell.
$d$. Steroidal hormones are synthesized by Golgi complex.