Question

Fill in the blanks with the appropriate words.
In a prokaryotic cell, .......... molecules of ATP are formed per molecule of glucose oxidised.

Answer 1

• In prokaryotic cells no membrane bound organelles are present and so there is no mitochondria for the process of kerb cycle or the oxidative phosphorylation.
• The process of glycolysis takes place in the cytoplasm and does not require any membrane bound organelles.
• The process of glycolysis uses 2 molecules of ATP during the formation of glucose 6 phosphate from glucose and fructose 1,6 phosphate from fructose 6 phosphate.
• While 4 ATP molecules are forms during formation 3 phosphoglycric acid from 1,3 bisphosphoglyceric acid and formation of pyruvic acid from phosphophenol pyruvic acid. Each reaction forms 2 molecules of ATP.
• Therefore the net gain of ATP after glycolysis is 2 ATP.
• So the prokaryotic organisms which do not have any other membrane bound organelles for the formation of ATP can only gain energy the process of glycolysis.
• Therefore the correct sentence is " In prokaryotic cells, 2 molecules of ATP are formed per molecule of glycose oxidized.