CSIR NET Life Science Previous Year Questions and Solution SECONDARY METABOLITES Archives - Page 3 of 3 - CSIR NET LIFE SCIENCE COACHING | NTA NET LIFE SCIENCE

9. The gene encoding for mevalonate-3-kinase is disrupted in a certain plant. Which one of the following staternents concerning the above plant is correct? (1) Mevalonic acid 3,5-biphosPhate will be synthesized, while there will be no synthesis of Mevalonic acid 5-phosphate. (2) Mevalonic acid 3,5-biphosphate and Isopentenyl diphosphate will be synthesized. (3) There will be no synthesis of Mevalonic acid 3, 5- biphosphate but Mevalonic acid will be synthesized. (4) Aceto acetyle-coA and Mevalonic acid will not be synthesized.

CSIR NET Life Science Previous Year Questions and Solution Plant Physiology

Effects of Mevalonate-3-Kinase Disruption on Mevalonate Pathway and Isoprenoid Biosynthesis in Plants

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November 27, 2025
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9. The gene encoding for mevalonate-3-kinase is disrupted in a certain plant. Which one of the following staternents concerning the above plant is correct? (1) Mevalonic acid 3,5-biphosPhate will be […]

8. In terpene biosynthesis pathways, three acetyl-CoA are joined together stepwise to form mevalonic acid. mevalonic acid to form isopentenyl diphosphate or Which one of the following three- steps is required by isopentenyl pyrophosphate (IPP)? (1)Pyrophosphorylation, decarboxylation, and dehydration. (2)Alkylation, pyrophosphorylation and decarboxylation. (3) Methylation, dehydration and alkylation. (4) Phosphorylation, carboxylation and methylation.

CSIR NET Life Science Previous Year Questions and Solution Plant Physiology

Key Steps in Isopentenyl Pyrophosphate Biosynthesis from Mevalonic Acid

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November 27, 2025
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8. In terpene biosynthesis pathways, three acetyl-CoA are joined together stepwise to form mevalonic acid. mevalonic acid to form isopentenyl diphosphate or Which one of the following three- steps is […]

7. Following are certain statements regarding secondary metabolites found in plant: A. All terpenes are derived from a six carbon element. B. Alkaloids are nitrogen containing compounds. C. Pyrethroids, a monoterpene ester found in the leaves and flower of Chrysanthemum species, show insecticidal activity. D. Limonoids are groups of alkaloids and have anti¬herbivoral activity. Which one of the following combinations of above statements is correct? (1) A and B (2) A and D (3) B and C (4) C and D

CSIR NET Life Science Previous Year Questions and Solution Plant Physiology

Key Plant Secondary Metabolites

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November 27, 2025
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Following are certain statements regarding secondary metabolites found in plant: A. All terpenes are derived from a six carbon element. B. Alkaloids are nitrogen containing compounds. C. Pyrethroids, a monoterpene […]

6. Following are certain statements regarding terpene class of secondary metabolites in plants: A. Isopentenyl diphosphate and its isomer combine to form larger terpenes. B. Diterpenes are 20 carbon compounds. C All terpenos are derived from the union of 4 carbon elements. D. Pyrothroids are monoterperie esters. Which one of the following combination of above statements is correct? (1) A, B and C (2) A, B and D (3) B, C and D (4) A, C and D

CSIR NET Life Science Previous Year Questions and Solution Plant Hormones

Biosynthesis and Characteristics of Plant Terpenes

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November 27, 2025
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Following are certain statements regarding terpene class of secondary metabolites in plants: A. Isopentenyl diphosphate and its isomer combine to form larger terpenes. B. Diterpenes are 20 carbon compounds. C […]

5. Following are a few statements regarding the structure of terpenes: A. Isopentenyl diphosphate and farnesyl diphosphate are monoterpene and sesquiterpene, respectively. B. Squalene and geranyl diphosphate are triterpene and monoterpene, respectively. C. Dimethylallyl diphosphate have 10 and 20 carbons, respectively. D. Diterpenes have 20 carbons, whereas sesquiterpenes have 15 carbons Which combination of the above statements is correct? (1) A and B (2) B and D (3) A and C (4) C and D

CSIR NET Life Science Previous Year Questions and Solution Plant Physiology

Structural Classification and Carbon Number of Terpenes

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November 27, 2025
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Following are a few statements regarding the structure of terpenes: A. Isopentenyl diphosphate and farnesyl diphosphate are monoterpene and sesquiterpene, respectively. B. Squalene and geranyl diphosphate are triterpene and monoterpene, […]

4. Which of the following acts as a branch point for the bioosynthesis of sesquiterpene and triterpenes? (1) Farnesyl pyrophosphate (2) Geranyl pyrophosphate (3) Isopentyl pyrophosphate (4) Hydroxyrnethylglularyl -CoA

CSIR NET Life Science Previous Year Questions and Solution Plant Physiology

Farnesyl Pyrophosphate: The Branch Point in Sesquiterpene and Triterpene Biosynthesis

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November 27, 2025
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Which of the following acts as a branch point for the bioosynthesis of sesquiterpene and triterpenes? (1) Farnesyl pyrophosphate (2) Geranyl pyrophosphate (3) Isopentyl pyrophosphate (4) Hydroxyrnethylglularyl -CoA Correct answer: […]

Which one of the following combinations of secondary metabolite biosynthetic pathway result in the biosynthesis of terpenes? (1) Mevalonic acid and MEP pathways (2) Malonic acid and MEP pathways (3) Shikimik acid and Malonic acid pathway (4) Shikimik acid and Mevalonic acid pathways

CSIR NET Life Science Previous Year Questions and Solution Plant Physiology

The Mevalonic Acid and MEP Pathways: Dual Routes for Plant Terpene Biosynthesis

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November 27, 2025
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Which one of the following combinations of secondary metabolite biosynthetic pathway result in the biosynthesis of terpenes? (1) Mevalonic acid and MEP pathways (2) Malonic acid and MEP pathways (3) […]

2. The following statements are made regarding secondary metabolites of plants: A. All secondary metabolites are constitutively produced in all cells of a plant during its entire life B. They serve as signals to help the plant survive adverse conditions C. They may be volatile compounds D. They contribute to flower colour Which one of the following options represents a combination of correct statements? (1) A, B and C (2) B, C and D (3) A, C and D (4) A, B and D

CSIR NET Life Science Previous Year Questions and Solution Plant Physiology

Roles and Characteristics of Plant Secondary Metabolites in Stress and Development

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November 27, 2025
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The following statements are made regarding secondary metabolites of plants: A. All secondary metabolites are constitutively produced in all cells of a plant during its entire life B. They serve […]