What do GTPases do the G protein ?

Explanation:

GTPases, also known as small G-proteins, bind GTP and GDP likewise, and are involved in signal transduction.

Small GTPases are enzymes that catalyze the hydrolysis of guanosine triphosphate (GTP) to guanosine diphosphate (GDP). As the most well-known members, Ras GTPases play essential roles in regulating cell growth, cell differentiation, cell migration, and lipid vesicle trafficking.

i would say the prokaryotic cells the prokaryotic cells are less complex, are usually found only in unicellular organisms and have more limited capabilities than eukaryotic cells.