Tag: biological oxidation

Questions Related to biological oxidation

Differences between photophosphorylation (PP) and oxidative phosphorylation (OP) is 

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

  1. In PP, synthesis is of ATP while in OP it is of ADP.

  2. In PP, oxygen is evolved while in OP oxygen is taken up.

  3. Both cannot take place in light.

  4. PP can take place in green leaves while OP cannot occur in green leaves.

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Correct Option: B
Explanation:

Both the oxidative phosphorylation and photophosphorylation are in which cells make energy in the form of ATP, oxidative phosphorylation occurs during cell respiration and photophosphorylation occurs during photosynthesis. Oxygen is released during photophosphorylation and oxygen is taken up.

So the correct option s 'In PP, oxygen is evolved while in OP oxygen is taken up'.

Which one is the last electron acceptor over ETC in oxidative phosphorylation?

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

  1. $H _2$

  2. $Cyt a _3$

  3. Cyt b

  4. $CO _2$

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Correct Option: B
Explanation:

Iron and copper are present in cytochrome a$ _3$, Iron transfer electron to oxygen through copper, so cytochromea3 called terminal electron donor.

So the correct option is Cyta$ _3$.'

Mitochondrial electron transport chain is

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

  1. Cyclic phosphorylation.

  2. Oxidative phosphorylation.

  3. Noncyclic phosphorylation.

  4. Photooxidation.

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Correct Option: B
Explanation:

The electron is transferred from NADH to oxygen in mitochondria con­sists of four multi-protein complexes is coupled to the synthesis of ATP from ADP and inorganic phosphate (Pi) which is called as oxidative phosphorylation. 

So the correct option is 'Oxidative phosphorylation.'

Coenzyme $NAD^+$ and FAD are connected with respiratory reactions as they

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

  1. Are involved in each step of ATP synthesis.

  2. Function in Krebs cycle and terminal oxidative phosphorylation.

  3. Act as hydrogen carrier.

  4. Are reducing agents.

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Correct Option: C
Explanation:

NAD and FAD plays a major role in cellular respiration,  They carry the H+ and electrons to Electron Transport Chain to convert ADP + Pi ATP.

So the correct option is 'Act as a hydrogen carrier.'

Glyceraldehyde phosphate is oxidised in glycolysis. The hydrogen atom and electron liberated cause

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

  1. Oxidation of NAD$^+$.

  2. Reduction of NAD$^+$.

  3. Change in oxaloacetic acid.

  4. Formation of methane.

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Correct Option: B
Explanation:

Glyceraldehyde-3-phosphate is oxidized by the coenzyme nicotinamide adenine dinucleotide (NAD). NAD+ is an oxidizing agent - it accepts electrons from other molecules and becomes reduced.

So the correct option is 'Reduction of NAD+'.

Which of the following is a biological uncoupler of oxidative phosphorylation?

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

  1. Thermogenin.

  2. 2, 4-Dichlorophenoxyacetic acid.

  3. 2, 4-Dinitrophenol.

  4. Ethylene diaminotetra-acetic acid.

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Correct Option: A
Explanation:

Brown adipose tissue is rich in mitochondria, containing an uncoupling protein (thermogenin) that uncouples oxidation and phosphorylation of adenosine diphosphate, reduces ATP production, and consequently enhances thermogenesis.

So the correct option is 'Thermogenin'.

Identify the wrong statement.

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

  1. Proton motive force drives the uniport.

  2. Movement of NO$ _3$ ions in cotransport is against their own concentration gradient.

  3. Azides inhibit the process of respiration.

  4. ATPase serves as proton-translocating carrier protein.

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Correct Option: A

In mechanism, photophosphorylation is very similar to

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

  1. substrate-level phosphorylation

  2. oxidative phosphorylation

  3. Calvin cycle

  4. glycolysis

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Correct Option: B
Explanation:

Oxidative phosphorylation is the process in which ATP is formed by the transfer of electrons from NADH or FADH 2 to O 2 by a series of electron carriers. The sunlight-driven production of ATP from ADP and inorganic phosphate is called photophosphorylation.

So, the correct option is, 'oxidative phosphorylation'.

FAD acts as an electron acceptor in between

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

  1. fumaric and mallic acid

  2. succinic and fumaric acid

  3. malic and oxaloacetic acid

  4. citric and isocitric acid

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Correct Option: B