$A$ chemical substance that,when irradiated with $UV$ rays,absorbs radiation and emits visible light is called:

Which organelle has a single membrane?

$DNA$ is not present in which of the following?

$[A]$ Anything less than a complete structure of a cell does not ensure independent living.
$[B]$ In eukaryotic cells,there is an extensive compartmentalization of cytoplasm through the presence of membrane-bound organelles.
$[C]$ The mitochondria divide by fission.
$[D]$ The vacuole is the membrane-bound space found in the cytoplasm.

Which of the following represents the correct sequence of relative sizes in descending order?

Differentiate between a prokaryotic cell and a eukaryotic cell.