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Types of Respiration

Which of thes...

Question

Which of these steps in Krebs cycle indicates substrate level phosphorylation?

A

Conversion of succinic acid to

α

-ketoglutaric acid

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B

Conversion of succinic acid to malic acid

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C

Conversion of succinyl CoA to succinic acid

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D

Conversion of malic acid to oxaloacetic acid

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E

Conversion of citric acid to

α -

ketoglutaric acid

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Solution

The correct option is B Conversion of succinyl CoA to succinic acid
Substrate level phosphorylation means when energy from breakdown of glucose is directly released as ATP or GTP. In Krebs cycle, only in one step GTP is released i.e., during the conversion of succinyl CoA to succinic acid. In all the other steps, energy is released as either NADH or FADH. Thus, the correct answer is option C.

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Similar questions

Q. In which of the following steps of citric acid cycle,

C O_{2}

\begin{matrix} I . C i t r i c a c i d & \to & α - k e t o g l u t a r i c a c i d I I . S u c c i n i c a c i d & \to & M a l i c a c i d I I I . M a l i c a c i d & \to & O x a l o a c e t i c a c i d I V . α - k e t o g l u t a r i c a c i d & \to & S u c c i n y l C o - A \end{matrix}

Select the correct answer using the codes given below

Q. What is the intermediate product between

α

-ketoglutaric acid and succinic acid in Krebs cycle?

The intermediate product between

α

-ketoglutaric acid and succinic acid in TCA cycle is

Q. Consider

A. alpha ketoglutaric acid

B. Succinic acid

C. Citric acid

D. Fumaric acid

E. Oxalosuccinic acid

Choose the correct order of their formation in the Krebs cycle.

Q. Match List I(compound oxidized during Krebs cycle) with List II(Compound formed on oxidation) and select the correct answer.

List-I	List-II
a. Pyruvic acid	$1$ . AcetylCoA
b. Isocitric acid	$2$ . Succinyl CoA
c. a-Ketoglutaric acid	$3$ . Oxaloacetic acid
d. Succinic acid	$4$ . Oxalosuccinic acid
	$5$ . Fumaric acid

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