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Biology
Respiration in Plants
48 questions from 31 papers, each with its answer.
- 48 questions
- 31 papers
- 1.36% of Biology
Enzyme Inhibition
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Inhibition of Succinic dehydrogenase enzyme by malonate is a classical example of:Malonate closely resembles the substrate succinate in structure. It competes with succinate for the active site of succinic dehydrogenase and blocks it, so the enzyme cannot convert succinate to fumarate. This is a classical example of competitive inhibition.
Enzyme Cofactors
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The cofactor of the enzyme carboxypeptidase is:Carboxypeptidase is a metalloenzyme. Zinc is its cofactor, which is essential for its catalytic activity in the hydrolysis of peptide bonds.
Steps of the Krebs (TCA) Cycle
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Identify the step in tricarboxylic acid cycle, which does not involve oxidation of substrate.The conversion of succinyl-CoA to succinic acid is a substrate-level phosphorylation step (GTP/ATP is formed) with release of coenzyme A; it does not involve oxidation of the substrate. The other steps – isocitrate to $\alpha$-ketoglutaric acid, succinic acid to fumaric/malic acid, and malic acid to oxaloacetic acid – are oxidation (dehydrogenation) steps.
Cellular Location of Respiratory Pathway Steps
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Match List-I with List-II regarding the location of steps of cellular respiration.
Pick the matching item from Column II for each row.
Column I
- A. Citric acid cycle
- B. Glycolysis
- C. Electron transport system
- D. Proton gradient
Column II
- I. Cytoplasm
- II. Mitochondrial matrix
- III. Intermembrane space of mitochondria
- IV. Inner mitochondrial membrane
Correct answer: A → II, B → I, C → IV, D → III
Citric acid cycle – mitochondrial matrix Glycolysis – cytoplasm Electron transport system – inner mitochondrial membrane Proton gradient – intermembrane space of mitochondria Correct match: A-II, B-I, C-IV, D-III.
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