17 Phenylalanine, a precursor of most of the phenolics in higher plants is a product of which one of the following pathways? (1) Shikimic acid pathway (2) Malonic acid pathway […]
Tag: CSIR NET Life Science Previous Year Questions and Solution SECONDARY METABOLITES
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CSIR NET Life Science Previous Year Questions and Solution Plant Physiology
Phenylpropanoid Pathway as the Source of Plant Phenolic Secondary Metabolites
16. Which of the following is produced in phenyl propanoid pathway? (1) Phenolics (2) Carotenes (3) Alkaloids (4) Terpenes Correct answer: (1) Phenolics Explanation: The phenylpropanoid pathway leads to the production […]
CSIR NET Life Science Previous Year Questions and Solution Plant Physiology
Phenylalanine as the Precursor of Plant Phenolic Secondary Metabolites
The precursor for most of phenolic secondary metabolites is (1) Phenyl alanine (2) Isopentyl pyrophosphate (3) Mevalonate (4) Geranyl phosphate Correct answer: (1) Phenyl alanine Explanation: Phenylalanine is the primary precursor […]
CSIR NET Life Science Previous Year Questions and Solution Plant Physiology
Fungal Pathogen Detoxification Mechanisms Against Plant Cyanogenic Glycoside Defenses
Certain plant species produce cyanogenic glycosides to protect them from pathogens. A researcher has identified a variant of such a plant that has higher level of cyanogenic glycoside yet it […]
CSIR NET Life Science Previous Year Questions and Solution Plant Physiology
Key Natural Terpenes: Artemisinin, Azadirachtin, Taxol, and Their Biological Roles
13. statements are made regarding natural product, terpenes. A. monoterpenes are five-carbon compounds. B. The anti-malarlal drug, artemisinin is a sesquiterpene. C. Azadirachtin is a triterpene derivative from the seed […]
CSIR NET Life Science Previous Year Questions and Solution Plant Physiology
Biosynthesis Pathways of Terpenes, Phenolics, and Alkaloids in Plant Secondary Metabolism
12. Following are some statements for synthesis of secondary metabolites in plants. (A) Terpenes are synthesized by shikimic acid pathway and mevalonic acid pathway. (B) Alkaloids are nitrogen containing compounds […]
CSIR NET Life Science Previous Year Questions and Solution Plant Physiology
Four Enzymatic Stages of Terpenoid Biosynthesis in Plants
11. Plants are known to synthesize more than 30,000 terpenoids, involving four stages of biosynthesis. Column X Column Y A. Biosynthesis i. Terpene of two basic five synthases carbon unit […]
CSIR NET Life Science Previous Year Questions and Solution Plant Physiology
Plant Secondary Metabolites: Biosynthesis and Role of Terpenes, Phenolics, and Alkaloids
10. Secondary metabolites are diverse array organic compounds in plants. The following are certain statements about secondary metabolites: A. They protect plants against being eaten by herbivores and against being […]
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
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 […]
CSIR NET Life Science Previous Year Questions and Solution Plant Physiology
Key Steps in Isopentenyl Pyrophosphate Biosynthesis from Mevalonic Acid
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 […]
