Tag: biological oxidation

Questions Related to biological oxidation

Kreb's cycle takes place in

bio-chemistry biological oxidation oxidative phosphorylation living organisms and energy production glycolysis

  1. Vesicles of E.R

  2. Mitochondria

  3. Dictyosomes

  4. Chloroplasts

Show answer
Correct Option: B
Explanation:

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.

This is the only enzyme that has FAD as coenzymes and thus there is a formation of FADH₂ molecule.
Mitochondria are only associated with aerobic respiration.
So, the correct option is 'Mitochondria'

When a pair of electrons from NADH+$H^+$ transported through respiratory ETS, results in the formation of 

bio-chemistry biological oxidation oxidative phosphorylation living organisms and energy production glycolysis

  1. 2 ATPs

  2. 4 ATPs

  3. 3 ATPs

  4. 5 ATPs

Show answer
Correct Option: C
Explanation:
  • 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

bio-chemistry biological oxidation oxidative phosphorylation living organisms and energy production glycolysis

  1. Oxidative phosphorylation

  2. Photolysis

  3. Phosphorylation

  4. Starch synthesis.

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Correct Option: A
Explanation:

The electron transport system is located in the inner membrane of the mitochondria.

The oxisomes or  F0-F1 particles are responsible for the transport of electrons. and ATP synthesis which takes place through electron transport system.
It is known as oxidative phosphorylation which is the addition of a phosphate group to ADP to form ATP in presence of oxygen.

So, the correct answer is 'Oxidative phosphorylation'

Oxidative phosphorylation is found in

bio-chemistry biological oxidation oxidative phosphorylation living organisms and energy production glycolysis

  1. Chloroplasts

  2. Leucoplasts

  3. Peroxisomes

  4. Mitochondria

Show answer
Correct Option: D
Explanation:

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.

So, the correct option is 'Mitochondria'.

Oxidative phosphorylation is production of

bio-chemistry biological oxidation oxidative phosphorylation living organisms and energy production glycolysis

  1. ATP in photosynthesis

  2. NADH in photosynthesis

  3. ATP in respiration

  4. NADH in respiration

Show answer
Correct Option: C
Explanation:

Formation of ATP from ADP in the presence of oxygen during the Krebs cycle is known as oxidative phosphorylation.

This takes place in mitochondria of the cell during oxidative phosphorylation a total of 28 ATP are formed.
So the correct option is 'ATP in respiration'

ATP is produced during

bio-chemistry biological oxidation oxidative phosphorylation living organisms and energy production glycolysis

  1. Cyclic photophosphorylation

  2. Non cyclic photophosphorylation

  3. Both (A) and (B)

  4. None of the above

Show answer
Correct Option: C
Explanation:

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 $FADH 2$ _____________.

bio-chemistry biological oxidation oxidative phosphorylation living organisms and energy production glycolysis

  1. Consumes one $O _2$

  2. Consumes one $H2 _O$ molecule

  3. Forms 2 ATP

  4. All the above

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Correct Option: C

Which is product of oxidative pentose phosphate pathway?

bio-chemistry biological oxidation oxidative phosphorylation living organisms and energy production glycolysis

  1. Pyruvic acid

  2. Acetyl CoA

  3. NADH$ _2$

  4. NAD(P)H

  5. ATP

Show answer
Correct Option: D
Explanation:

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.

So the answer is 'NAD(P)H'.

How many ATP molecules can be produced through oxidative phosphorylation of 2 $NADH 2$ and 3 $FADH _2$ _______.

bio-chemistry biological oxidation oxidative phosphorylation living organisms and energy production glycolysis

  1. 15

  2. 24

  3. 6

  4. 12

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Correct Option: D

One molecule of NADH and one molecule of $FADH _2$ yield

bio-chemistry biological oxidation oxidative phosphorylation living organisms and energy production glycolysis

  1. 2 and 3 ATP

  2. 18 and 36 ATP

  3. 36 and 18 ATP

  4. 3 and 2 ATP

  5. 2 and 36 ATP

Show answer
Correct Option: D
Explanation:

Reduced molecules like NADH+H+ and FADH2 yield energy in the form of ATP when they undergo ETC in mitochondria. NADH+H+ enter ETC at higher complex than FADH2 so they release energy as 3 ATP and 2 ATP respectively.

So the answer is '3 and 2 ATP'.