Tag: bio-chemistry

Quizzes (82) Questions (1918)

Questions Related to bio-chemistry

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'.

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

FAD is electron acceptor in citric acid cycle during the oxidation of

  1. Malic acid to oxaloacetatic acid.

  2. Succinic acid to malic acid.

  3. Citric acid to -ketoglutaric acid.
  4. $\alpha$-ketoglutaric acid to succinic acid.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The Krebs cycle is the condensation of acetyl group with oxaloacetic acid and water to yield citric acid and leads to the formation of Oxalo acetic acid.

Eighth step in which Succinic acid converts into Fumaric acid in the presence of enzyme succinic dehydrogenase release energy and form FADH which yields 2ATP.
So the correct option is 'Succinic acid to Fumaric acid.'

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

The process of phosphorylation takes place in

  1. Glycolysis

  2. Kreb's cycle

  3. HMP pathway

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Phosphorylation is the addition of a phosphate (PO$ _{4}^{3-}$) group to a protein or other organic molecule. Phosphorylation results in the formation of ATP, which is the energy currency of cell. Phosphorylation occurs as a part of glycolysis, Kreb's cycle and HMP pathway.