Tag: biological oxidation

Quizzes (3) Questions (149)

Questions Related to biological oxidation

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

Kreb's cycle takes place in

  1. Vesicles of E.R

  2. Mitochondria

  3. Dictyosomes

  4. Chloroplasts
Reveal answer Fill a bubble to check yourself
B Correct answer
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'

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

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

  1. 2 ATPs

  2. 4 ATPs

  3. 3 ATPs

  4. 5 ATPs
Reveal answer Fill a bubble to check yourself
C Correct answer
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'.
Multiple choice bio-chemistry biological oxidation oxidative phosphorylation living organisms and energy production glycolysis

Mitochondria are sites of

  1. Oxidative phosphorylation

  2. Photolysis

  3. Phosphorylation

  4. Starch synthesis.
Reveal answer Fill a bubble to check yourself
A Correct answer
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'

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

Oxidative phosphorylation is found in

  1. Chloroplasts

  2. Leucoplasts

  3. Peroxisomes

  4. Mitochondria
Reveal answer Fill a bubble to check yourself
D Correct answer
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'.

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

Oxidative phosphorylation is production of

  1. ATP in photosynthesis

  2. NADH in photosynthesis

  3. ATP in respiration

  4. NADH in respiration
Reveal answer Fill a bubble to check yourself
C Correct answer
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'

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

ATP is produced during

  1. Cyclic photophosphorylation

  2. Non cyclic photophosphorylation

  3. Both (A) and (B)

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

Which is product of oxidative pentose phosphate pathway?

  1. Pyruvic acid

  2. Acetyl CoA
  3. NADH$ _2$

  4. NAD(P)H

  5. ATP
Reveal answer Fill a bubble to check yourself
D Correct answer
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'.

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

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

  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
Reveal answer Fill a bubble to check yourself
D Correct answer
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'.