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A cell line deficient in salvage pathway for nucleotide biosynthesis was fed with medium containing 15N labelled amino acids. Purines were then extracted. Treatment with which one of the following […]

The first few steps of the tryptophan biosynthetic pathway in plants along with the available mutants is provided below Column X represents genotypes and Column Y summarizes the anthranilate fluorescence […]

The first step in the biosynthesis of valine begines with enzyme catalyzed condensation of two molecules of pyruvic acid. If an equimolar mixture of 13CH3COCOOH and 12CH3COCOOH are used as […]

The inborn error of amino acid metabolism, alkaptonuria. is due to the lack of one of the following enzymes: (1) Fumaryl acetoacetate hydrolase (2) α-keto acid decarboxylase (3) Hornogentisate oxidase […]

Choose the correct answer from the following statements on biosynthesis. (1) In the biosynthesis of palmitate, all the carbon atoms are derived from activated malonate. (2) The amino acids Met, […]

Biosynthesis of tyrosine is detailed below: Shikimic acid – A → shikimic acid-5-phosphate -B → C → chorismic acid → prephenic acid → D → transaminase → tyrosine. Identify A, […]

Sting of a bee causes pain, redness and swelling. Melittin is a major peptide in bee venom. Melittin is a membrane binding peptide that is involved in activating phospholipases in […]

Major regulatory step in cholesterol biosynthesis is (1) HMG coA reductase (2) HMG CoA synthase (3) Thiokinase (4) Mevalonate kinase Cholesterol is an essential lipid molecule involved in maintaining cell […]

Number of cycles required to completely hydrolyze Arachidonic acid into acetyl CoA is (1) 9 (2) 8  (3) 10 (4) 11 Arachidonic acid is a polyunsaturated fatty acid with 20 […]

Common metabolites in nucleotide biosynthesis derived from pentose phosphate pathway is (1) PRPP (2) Glycerladehyde-3-P (3) DHAP (4) Sedoheptulose 7-P The pentose phosphate pathway (PPP) is a crucial metabolic route […]