Flagella with a single strand and composed of flagellin protein are found in:

How many distinct layers can be identified in the cell envelope of a bacterium?

Identify the correct group of prokaryotic cells from the following list:
$1.$ Egg of ostrich,$2.$ $PPLO$,$3.$ Tracheid,$4.$ Blue-green algae,$5.$ Bacteria,$6.$ Animal cells.

Define the following terms:
$(i)$ Eukaryotic cell
$(ii)$ Plasmid

Which of the following is absent in a prokaryotic cell?

The $DNA$ of $E. coli$ is