STD 11 - 18. Neural control and coordination — BIOLOGY STD 11 Science — Question

$R$-It is because of the ionisable nature of $-NH_2$ and $-COOH$ groups

$(i)$ Mesosome is formed by the extensions of plasma membrane into the cell.

$(ii)$ The pili are elongated tubular structures made up of a protein.

$(iii)$ Flagellum is composed of filament, hook and basal body.

$(iv)$ Ribosomes are about $30\; nm$ by $50\; nm$ in size.