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Respiration plays a significant role in the life of plants. The important ones are given below:
(i) It releases energy, which is consumed in various metabolic processes necessary for life of plant.
(ii) Energy produced can be regulated according to requirement of all activities.
(iii) It converts in soluble foods into soluble form.
(iv) Intermediate products of cell respiration can be used in different metabolic pathways
Photosynthesis
Respiration
Occurs only in chlorophyll containing cells of plants.
Occurs in all plant and animal cells.
Takes place only in the presence of light.
Takes place continually both in light and in the dark.
During photosynthesis, radiant energy is converted into potential energy.
During respiration, potential energy is converted into kinetic energy.
Sugars, water and oxygen are products.
CO2 and H2O are products.
Synthesizes foods.
Oxidizeds foods.
CO2 and H2O are raw materials.
O2 and food molecules are raw materials.
Photosynthesis is an endothermal process.
Respiration is an exothermal process.
Stores energy.
Releases energy.
It includes the process of hydrolysis, carboxylation etc.
It includes the process of the dehydrolysis, decarboxylation, etc.
Results in an increase in weight.
Results in a decrease in weight.
It is an anabolic process.
It is a catabolic process.
Require cytochrome.
Also require cytochrome.
S.No.
Characters
Cell respiration
Combustion
(i)
Nature of process
Biochemical and stepped process.
Physico-chemical and spontaneous process.
(ii)
Site of occurrence
Inside the cells.
Non-cellular.
(iii)
Control
Biological control.
Uncontrolled.
(iv)
Energy release
Energy released in steps.
Large amount of energy is released at a time.
(v)
Temperature
Remain within limits.
Rises very high.
(vi)
Light
No light is produced.
Light may be produced.
(vii)
Enzymes
Controlled by enzymes.
Not controlled by enzymes.
(viii)
Intermediates
A number of intermediates are produced.
No intermediate is produced.
S. No.
Enzyme
Coenzyme (s) and cofactor
Activator (s)
Inhibitor (s)
Kind of reaction catalyzed
Hexokinase
Mg2+
ATP4-, Pi
Glucose 6-phopshate
Phosphoryl transfer
Phosphogluco-isomerase
Mg2-
-
2-dioxyglucose
6-phosphate
Isomerization
Phosphofructo-kinase
Fructose 2, 6-diphosphate, AMP, ADP, cAMP, K+
ATP 4-, citrate
Aldolase
Zn2+
( in microbes)
Chelating agents
Aldol cleavage
Phosphotriose isomerase
Glyceraldehyde
3-phosphate dehydrogenase
NAD
Iodoacetate
Phosphorylation coupled to oxidation
Phosphoglycerate kinase
Phosphoglycerate mutase
Mg2+ 2,3-diphos phoglycerate
Phosphoryl shift
(ix)
Enolase
Mg2+ , Mn2+, Zn2+, Cd2+
Fluoride+ phosphate
Dehydration
(x)
Pyruvate kinase
Mg2+, K+
Acetyl CoA, analine, Ca2+
Total Inputs
Total Outputs
1 molecule of glucose (6 C)
2 molecules of pyruvate (2×3 C)
2 ATP
4 ATP
4 ADP
2 ADP
2 × NAD +
2× NADH + 2H+
2 Pi
2×H2O
Step
(Location in mitochondria)
Coenzyme(s) and cofactor (s)
Inhibitor(s)
Type of reaction catalyzed
(a)
Citrate synthetase
Matrix space
CoA
Monofluoro-acetyl- CoA
Condensation
(b)
Aconitase
Inner membrane
Fe2+
Fluoroacetate
(c)
Isocitrate dehydrogenase
NAD+, NADP+, Mg2+, Mn2+
ATP
Oxidative decarboxylation
(d)
alpha-ketoglutarate dehydrogenase complex
TPP,LA,FAD,CoA,
NAD+
Arsenite,Succinyl-CoA, NADH
(e)
Succinyl-CoA synthetase
Substrate level
phosphorylation
(f)
Succinate dehydrogenase
FAD
Melonate, Oxaloacetate
Oxidation
(g)
Fumarase
None
Hydration
(h)
Malate dehydrogenase
NADH
ATP formation in Glycolysis
Steps
Product of reactions
In terms of ATP
ATP formation by substrate phosphorylation
1, 3-diphosphoglyceric acid (2 moles) ®
3 phosphoglyceric acid (2 moles)
Phosphoenolpyruvic acid (2 moles) ®
Pyruvic acid (2 moles)
Total
ATP formation by oxidative phosphorylation or ETC
1, 3 - disphosphoglyceraldehyde (2 moles)
1, 3 – diphosphoglyceric acid (2 moles)
2 NADH2
6 ATP
Total ATP formed
4 + 6 ATP =
10 ATP
ATP consumed in Glycolysis
Glucose (1 mole) ® Glucose 6 phosphate (1 mole)
Fructose 6 phosphate (1 mole) ®
Fructose 1, 6-diphosphate (1 mole)
– 1 ATP
Net gain of ATP = total ATP formed – Total ATP consumed
10 ATP – 2ATP
8 ATP
ATP formation in Kreb’s cycle
Succinyl CoA (2 mols) ®
Succinic acid (2 mols)
2 GTP
Pyruvic acid (2 mols) ®
Acetyl CoA (2 mols)
Isocitric acid (2 mols) ®
Oxalosuccinic acid (2 mols)
a-Ketoglutaric acid (2 mols) ®
Succinyl CoA (2 mols)
Succinic acid (2 mols) ®
Fumaric acid (2 mols)
Malic acid (2 mols) ®
Oxaloacetic acid (2 mols)
2 FADH2
28 ATP
Net gain in Kreb’s cycle (substrate phosphorylation + oxidative phosphorylation)
2ATP + 28 ATP
30 ATP
Net gain of ATP in glycolysis and Kreb’s cycle
Net gain of ATP in glycolysis + Net gain of ATP in Kreb’s cycle
8 ATP + 30 ATP
38 ATP
Over all ATP production by oxidative phosphorylation or ETC
ATP formed by oxidative phosphorylation in glycolysis + ATP formed by oxidative phosphorylation or ETC.
6 ATP + 28 ATP
34 ATP
Aerobic Respiration
Anaerobic Respiration
Fermentation
Molecular oxygen is the ultimate electron acceptor for biological oxidation. The ETS serves to transfer electrons from oxidisable donor to molecular oxygen. The early enzymatic steps involve dehydrogenation whereas the final steps are mediated by a group of enzyme called cytochromes. Ultimately the electrons are transferred to oxygen which is reduced to water. During aerobic respiration ATP is generated by coupled reaction
The ultimate electron acceptor is an inorganic compound other than oxygen. The compounds accepting the hydrogen (electrons) are nitrates, sulphates, carbonates or CO2. Anaerobic respiration produces ATP through phosphorylation reaction involving electron transfer systems. (mechanism not known)
The final electron acceptors are organic compounds. Both electron donors (oxidizable substrate) and electron acceptors (oxidizing agent) are organic compounds and usually both substrates arise from same organic molecules during metabolism. Thus part of the nutrient molecule is oxidised and part reduced and the metabolism results in intramolecular electron rearrangement. ATP is generated by substrate level phosphorylation. This reaction differs from oxidative phosphorylation because oxygen itself is not required for ATP generation.
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