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Question

Product formed by the activity of malic dehydrogenase in the TCA cycle is

A

Fumaric acid.

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B

Malic acid.

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C

Oxaloacetic acid.

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D

Succinic acid.

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Solution

The correct option is C Oxaloacetic acid.
Malic acid dehydrogenase or malate dehydrogenase is a Krebs cycle enzyme, which converts malic acid into oxaloacetic acid with the simultaneous reduction of one NAD molecule into reduced coenzyme $N A D H_{2}$ .

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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. Pick the reaction from the following where the reduction of FAD

^{+}

occurs in the reactions of respiration.
(I) Succinic acid

\to

Fumaric
(II) Malic acid

\to

Oxaloacetic acid
(III) 2 phosphoglycerate

\to

Phosphoenol pyruvic acid
(IV) Pyruvic acid

\to

Q. The product formed by malic acid dehydrogenase is ?

Q. Pick up the reactions from the following where a water molecule is removed and reduction of

N A D^{+}

does not occur in the reactions of respiration.
i) Succinic acid to fumaric acid
ii) Malic acid to oxaloacetic acid
iii) 2-Phosphoglycerate to phosphoenol pyruvic acid
iv) Pyruvic acid to acetyl CoA

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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