Respiration in Plants Test

Result

Respiration in Plants Test - 1

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

Internal regulation of the Krebs cycle helps in the prevention of wastage and overproduction. Which enzyme does succinyl-CoA inhibit as a part of internal regulation?

A
Pyruvate dehydrogenase

B
Alpha-ketoglutarate dehydrogenase

C
Isocitrate dehydrogenase

D
Succinate dehydrogenase (SDH)

Solution

Succinyl-CoA inhibits alpha-ketoglutarate dehydrogenase. Succinyl-CoA is an allosteric inhibitor that causes feedback inhibition when ample amount of succinyl-CoA is present.
Question 2
1 / -0

Which of the following sentences about oxidative phase of pentose phosphate pathway is correct?

A
The steps of oxidative phase are reversible.

B
Ribose-5-phosphate is one of the intermediates formed in oxidative phase of pentose phosphate pathway.

C
NADPH is oxidised in pentose phosphate pathway.

D
Reduction of NADP⁺ occurs with oxidation of glucose-6-phosphate.

Solution

Glucose-6-phosphate is oxidised to form lactone. NADPH is produced as a by-product of this reaction. NADP⁺ is reduced as glucose-6-phosphate is oxidised.
Question 3
1 / -0

During oxidative phosphorylation, proton gradient is not generated by

A
complex 1

B
complex 2

C
complex 3

D
complex 4

Solution

Complex 2 oxidises succinate to fumarate and reduces ubiquinone. As this reaction releases less energy than the oxidation of NADH, complex 2 does not transport protons across the membrane and does not contribute to the proton gradient.
Question 4
1 / -0

Which of the following enzymes carries out substrate level phosphorylation in Krebs cycle?

A
Succinyl-CoA synthetase

B
Succinate dehydrogenase

C
Fumarate hydratase

D
Malate dehydrogenase

Solution

Succinyl-CoA synthetase cleaves the thioester bond of succinyl-CoA. This reaction is coupled to the phosphorylation of a purine nucleoside diphosphate, usually GDP. This is the only example of substrate level phosphorylation in citric acid cycle.
Question 5
1 / -0

In glycolysis, which enzyme catalyses the reaction that generates first ATP in the pathway?

A
Pyruvate kinase

B
Phosphoglycerate kinase

C
Glyceraldehyde-3-phosphate dehydrogenase

D
Phosphoglucoisomerase

Solution

Reaction by phosphoglycerate kinase generates the first ATP in glycolytic pathway. Phosphoglycerate kinase in presence of Mg ions converts 1,3-bisphosphoglyceric acid to phosphoenol pyruvate with generation of 2 molecules of ATP.
Question 6
1 / -0

A substance having respiratory quotient (RQ) equal to unity is most probably

A
glucose

B
mustard seed

C
malic acid

D
Oxalic acid

Solution

Glucose being a carbohydrate has RQ equal to unity.
Question 7
1 / -0

Which intermediate of TCA cycle provides the carbon skeletons for the synthesis of pyrimidines?

A
Phosphoenol pyruvate

B
Succinyl-CoA

C
Alpha ketoglutarate

D
Oxaloacetate

Solution

The pyrimidines are partly assembled from aspartate that is derived from oxaloacetate. The pyrimidines, thymine, cytosine and uracil form the complementary bases to the purine bases in DNA and RNA, and are also components of CTP, UMP, UDP and UTP.
Question 8
1 / -0

Pyruvate dehydrogenase complex consists of all of the following cofactors, except

A
thiamine pyrophosphate (TPP)

B
flavin mononucleotide (FMN)

C
lipoic acid

D
NAD⁺

Solution

FMN is not used as a cofactor for any enzyme of pyruvate dehydrogenase complex. FMN acts as a component of Complex I of the electron transport chain.
Question 9
1 / -0

Coenzyme ubiquinone is involved in a reaction catalysed by

A
malate dehydrogenase

B
succinyl-CoA synthetase

C
succinate dehydrogenase

D
α-Ketoglutarate dehydrogenase

Solution

Ubiquinone acts as a coenzyme in an oxidation reaction catalysed by succinate dehydrogenase. Succinate dehydrogenase converts succinate into fumarate, and in the process ubiquinone gets converted into ubiquinol.
Question 10
1 / -0

NADH-Coenzyme Q oxidoreductase, involved in electron transfer chain, is

a. a flavoprotein
b. first protein in ETC
c. bound to flavin adenine dinucleotide
d. a lipid soluble enzyme

A
a and b

B
a, b and c

C
a and d

D
c and d

Solution

NADH-Coenzyme Q is a flavoprotein and first protein in the electron transport chain.

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

Respiration in Plants Test - 1

Result

Respiration in Plants Test - 1

Score

-

Rank

-

SHARING IS CARING

Question 1

Pyruvate dehydrogenase

Alpha-ketoglutarate dehydrogenase

Isocitrate dehydrogenase

Succinate dehydrogenase (SDH)

Solution

Question 2

The steps of oxidative phase are reversible.

Ribose-5-phosphate is one of the intermediates formed in oxidative phase of pentose phosphate pathway.

NADPH is oxidised in pentose phosphate pathway.

Reduction of NADP+ occurs with oxidation of glucose-6-phosphate.

Solution

Question 3

complex 1

complex 2

complex 3

complex 4

Solution

Question 4

Succinyl-CoA synthetase

Succinate dehydrogenase

Fumarate hydratase

Malate dehydrogenase

Solution

Question 5

Pyruvate kinase

Phosphoglycerate kinase

Glyceraldehyde-3-phosphate dehydrogenase

Phosphoglucoisomerase

Solution

Question 6

glucose

mustard seed

malic acid

Oxalic acid

Solution

Question 7

Phosphoenol pyruvate

Succinyl-CoA

Alpha ketoglutarate

Oxaloacetate

Solution

Question 8

thiamine pyrophosphate (TPP)

flavin mononucleotide (FMN)

lipoic acid

NAD+

Solution

Question 9

malate dehydrogenase

succinyl-CoA synthetase

succinate dehydrogenase

α-Ketoglutarate dehydrogenase

Solution

Question 10

a and b

a, b and c

a and d

c and d

Solution

User

Question Analysis

My Perfomance

Score

-

Rank

-

Results Announcement on: coming Monday

Stay Tuned: We’ll update you on your result via email or SMS.

Reduction of NADP⁺ occurs with oxidation of glucose-6-phosphate.

NAD⁺