Multiple Choice QuestionsSolarisation is
formation of chlorophyll
destruction of chlorophyll
utilisation of sunlight
effects of solar light
Decarboxylation is involved in
electron transport system
glycolysis
Kreb's cycle
lactic acid fermentation
Osmotic pressure of a solution is
greater than pure solvent
less than pure solvent
equal to pure solvent
less than or greater than pure solvent
The incomplete breakdown of sugars in anaerobic respiration results in the formation of
fructose and water
glucose and CO2
alcohol and CO2
water and CO2
During which stage in the complete oxidation of glucose are the greatest number of ATP molecules formed from ADP?
Conversion of pyruvic acid to acetyl Co-A
Electron transport chain
Glycolysis
Krebs cycle
B.
Electron transport chain
In glycolysis, 4 ATP and 2 NADH2 molecules are formed. These 2 NADH2 molecules go to electron transport chain.
In oxidative decarboxylation no ATP molecules are formed but two molecules of NADH2 are formed from two molecules of pyruvate. And both NADH2 molecules go to ETC (Electron Transport Chain).
In Krebs cycle 2 ATP, 6NADH2 and 2FADH2 molecules are formed from two molecule of acetyl Co-A. These NADH2 and FADH2 go to ETC.
In ETC all NADH2 and FADH2 pass to electron carriers and yield 3 ATP and 2 ATP molecules per NADH2 and FADH2 respectively. Thus,
4 ATP are formed in glycolysis
2 ATP in Krebs cycle and
34 ATP from electron transport chain
40 ATP
2 ATP molecules are used during glycolysis.
So, net gain of ATP molecules during one complete oxidation of a glucose molecule is 38 ATP.
Chemiosmotic theory of ATP synthesis in the chloroplasts and mitochondria is based on
proton gradient
accumulation of K ions
accumulation of Na ions
membrane potential
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