Tag: glycolysis
Questions Related to glycolysis
Terminal oxidation comprises
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Synthesis of metabolic water
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Electron transport
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Oxidative phosphorylation
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All the above
The respiratory breakdown of glucose in the presence of oxygen is an oxidative process. During this process, several intermediates such as pyruvic acid, isocitric acid, succinic acid and oxalic acid are oxidized. Each oxidation step involves the release of 2 H which goes to reduce various coenzymes i.e. NAD+ and FAD. Reduced NAD+ and FAD released in the glycolysis and Krebs cycle finally reduce oxygen to water. This transfer of H+ and e- from NADH + H+ or FADH2 to oxygen is not a simple process and the direct transfer of electrons from coenzymes to oxygen is thermodynamically not possible. To facilitate this transfer, many intermediate cytochromes and other carriers are arranged in a series which transport electrons from NADH or FADH2 to oxygen. This sequence of electron carriers constitutes electron transport system. The electron transport proceeds from carriers that have low redox potential to those having high redox potential. The electron transport down to the energy gradient through electron transport system leads to the formation of ATP from ADP and inorganic phosphate. This generation of ATP is called oxidative phosphorylation.
Kreb's cycle takes place in
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Vesicles of E.R
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Mitochondria
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Dictyosomes
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Chloroplasts
Kreb cycle is also known as the citric acid cycle or tricarboxylic acid cycle takes place in the inner membrane of mitochondria. It occurs there because the necessary enzyme for the Krebs cycle, succinic dehydrogenase is only found in the inner membrane of the mitochondria.
When a pair of electrons from NADH+$H^+$ transported through respiratory ETS, results in the formation of
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2 ATPs
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4 ATPs
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3 ATPs
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5 ATPs
- Glycolysis and Krebs cycle yield certain reduced coenzymes like NADH+H+ and FADH2.
- ETS is metabolic pathway of electron transport that oxidizes these coenzymes to release energy from them.
- NADH+H+ gets oxidized at Complex I of ETS and as the electrons are transferred to other Complexes, it creates a proton gradient for ATP production. One NADH+H+ yields 3 ATPs and one FADH2 yields 2 ATPs.
- So the correct answer is '3 ATPs'.
Mitochondria are sites of
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Oxidative phosphorylation
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Photolysis
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Phosphorylation
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Starch synthesis.
The electron transport system is located in the inner membrane of the mitochondria.
Oxidative phosphorylation is found in
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Chloroplasts
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Leucoplasts
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Peroxisomes
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Mitochondria
The process of formation of ATP during oxidation of reduced coenzymes in the electron transport chain is known as oxidative phosphorylation. This process takes place in the mitochondrial membrane because in mitochondrial membrane there are specialized particles which are known as oxysomes which contain coenzymes for electron transfer.
Oxidative phosphorylation is production of
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ATP in photosynthesis
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NADH in photosynthesis
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ATP in respiration
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NADH in respiration
Formation of ATP from ADP in the presence of oxygen during the Krebs cycle is known as oxidative phosphorylation.
ATP is produced during
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Cyclic photophosphorylation
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Non cyclic photophosphorylation
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Both (A) and (B)
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None of the above
ATP is produced during both cyclic and non-cyclic photophosphorylation. During non-cyclic photophosphorylation when electrons move from PS II to PS I, then ATP and $NADPH _2$ is generated and during cyclic photophosphorylation only ATP is generated.
A molecule of $FADH 2$ _____________.
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Consumes one $O _2$
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Consumes one $H2 _O$ molecule
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Forms 2 ATP
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All the above
Which is product of oxidative pentose phosphate pathway?
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Pyruvic acid
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Acetyl CoA
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NADH$ _2$
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NAD(P)H
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ATP
Pentose phosphate pathway or HMP is an oxidative phosphate pathway of cellular respiration in which glucose 6-phosphate acts as the substrate. After its complete oxidation through HMP, 12 NADPH + H+ and 6 CO2 are formed. This pathway is an alternate pathway to glycolysis and is seen in RBC, adrenal cortex, liver, etc. A net gain of 35 ATP is achieved through this pathway.
How many ATP molecules can be produced through oxidative phosphorylation of 2 $NADH 2$ and 3 $FADH _2$ _______.
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15
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24
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6
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12