Which of the following statements are correct?
$I$. $PPLO$ is the smallest cell.
$II$. Prokaryotic cells are smaller than eukaryotic cells.
$III$. Cell division in prokaryotic cells is slow.
$IV$. All bacteria show solitary and colonial forms.
$V$. Cell division in prokaryotic cells is very rapid.

What is common in mitochondria,chloroplast and nucleus?

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.

The best material for demonstrating streaming movements of protoplasm within living cells is

Which organelle given below is not a part of the endomembrane system?

Name two cell-organelles that are double membrane-bound. What are the characteristics of these two organelles? State their functions and draw labelled diagrams of both.