Kreb's cycle and ETS_MCQ_Advance Level

Kreb's cycle and ETS - Advance

Dear Readers,

The Krebs cycle takes place inside the mitochondria. The Krebs cycle produces the CO₂ that you breath out. Electron transport chain. This stage produces most of the energy ( 34 ATP molecules, compared to only 2 ATP for glycolysis and 2 ATP for Krebs cycle). The electron transport chain takes place in the mitochondria.

Q1.  The correct sequence of electron acceptor in ATP synthesis is

•  Cyt a₃, a, b, c
•  Cyt b, c, a, a₃
•  Cyt b, c, a₃, a
•  Cyt c, b, a, a₃

Cyt b, c, a, a₃

Q2.  Krebs cycle involves the formation of

•  Lactic acid from glucose
•  Change of pyruvic acid to energy transformation
•  Pyruvic acid from glucose
•  ATP from ADP

Change of pyruvic acid to energy transformation

Q3.  Pyruvate (pyruvic acid) dehydrogenase is used in converting

•  Pyruvate to glucose
•  Glucose to pyruvate
•   Pyruvic acid to lactic acid
•   Pyruvate (pyruvic acid) to acetyl CoA

Pyruvate (pyruvic acid) to acetyl CoA

Q4.  Which of the following observation most strongly support the view that mitochondria contain electron transfer enzymes aggregated into compact associations

•   A contractile protein capable of utilizing ATP has been obtained from mitochondria
•   Mitochondria have highly folded inner wall
•  Disruption of mitochondria yields membrane fragments which are able to synthesize ATP
•  Mitochondria in animal embryos have a tendency to concentrate in cell which are to become part of locomotory structures

Disruption of mitochondria yields membrane fragments which are able to synthesize ATP

Q5.  Between which of the following stages GTP is formed by substrate level phosphorylation

•  Succinate to fumarate
•  Ketoglutarate to succinate
•  Oxalosuccinate to glutarate
•  Fumarate to malate

Ketoglutarate to succinate

Q6.  Which transfer electrons in E.T.S. (electron transport system)

•  Phytochrome
•  F₁ particles
•   Fe-S
•   Cytochrome

Fe-S

Q7.  The membrane bound enzyme involved in Krebs cycle is

•  Malate dehydrogenase
•  Fumarase
•  Cis acotinase
•  Succinic dehydrogenase

Succinic dehydrogenase

Q8.  Krebs cycle is

•  Oxidation of glucose to alcohol and water
•  Oxidation of acetyl CoA to carbon dioxide and water involving electron transport
•   Complete oxidation of acetyl CoA without electron transport
•   Complete reduction of acetyl CoA to carbon dioxide and water

Oxidation of acetyl CoA to carbon dioxide and water involving electron transport

Q9.  Who gave the term cytochrome

•  C.A. Mummoon
•  W.J. Young
•  A. Harden
•  K.P. Keilin

K.P. Keilin

Q10.  The mobile electron carrier of mitochondrial membrane is

•   Cyt a₃
•   FeS
•  CoQ
•   Cyt c₁

CoQ