Description : Vitamin B1 coenzyme (TPP) is involved in (A) Oxidative decarboxylation (B) Hydroxylation (C) Transamination (D) Carboxylation
Last Answer : Answer : A
Last Answer : (A) Oxidative decarboxylation
Description : Histamine is formed from histidine by (A) Deamination (B) Dehydrogenation (C) Decarboxylation (D) Carboxylation
Last Answer : Answer : C
Description : Histidine is converted into histamine by (A) Carboxylation (B) Decarboxylation (C) Methylation (D) Hydroxylation
Last Answer : Answer : B
Description : Biotin is essential for (A) Translation (B) Carboxylation (C) Hydroxylation (D) Transamination
Description : A coenzyme required in carboxylation reactions is (A) Lipoic acid (B) Coenzyme A (C) Biotin (D) All of these
Description : Which co-enzyme is not involved in oxidative decarboxylation of pyruvic acid? (A) TPP (B) Mg++ (C) Biotin (D) CoA-SH
Description : Pyridoxal phosphate is central to (A) Deamination (B) Amidation (C) Carboxylation (D) Transamination
Last Answer : Answer : D
Description : d-UMP is converted to TMP by (A) Methylation (B) Decarboxylation (C) Reduction (D) Deamination
Description : Pyruvate is converted into acetyl-CoA by (A) Decarboxylation (B) Dehydrogenation (C) Oxidative decarboxylation (D) Oxidative deamination
Description : Histidine is converted to histamine through the process of (A) Transamination (B) Decarboxylation (C) Oxidative deamination (D) Urea cycle
Description : Epinephrine is derived from norepinephrine by (A) Decarboxylation (B) Hydroxylation (C) Oxidation (D) N-methylation
Description : The sequential steps in the conversion of tyrosine to epinephrine are (A) Ring hydroxylation-decarboxylation-side chain hydroxylation-N-methylation (B) Side chain hydroxylation-decarboxylation- ... chain hydroxylation-N-methylation (D) N-methylation-decarboxylation-ring and side chain hydroxylation
Description : The rate limiting step in the biosynthesis of catecholamines is (A) Decarboxylation of dihydroxyphenylalanine (B) Hydroxylation of phenylalanine (C) Hydroxylation of tyrosine (D) Oxidation of dopamine
Description : The vitamin required for carboxylation reaction is (A) Vitamin B2 (B) Vitamin B6 (C) Biotin (D) Vitamin B12
Description : One of the main functions of Vitamin K is the cofactor for (A) Carboxylase for the formation of γ--carboxy glutamate (B) Methylation by S-adenosyl methionine (C) Carboxylation by biotin (D) One carbon transfer by tetra hydrofolate
Description : One of the main functions of Vitamin K is cofactor for (A) Carboxylate for the formation of γ carboxyglutamate (B) Methylation of δ-adenosyl methionine (C) Carboxylation of biotin (D) One carbon transfer by tetrahydrofolate
Description : A molecule of CO2 is captured by biotin when it acts as coenzyme for carboxylation reaction. The carboxyl group is covalently attached to (A) A nitrogen (N1) of the biotin molecule (B) Sulphur of thiophene ring (C) α-Amino group of lysine (D) α-Amino group of protein
Description : Carboxylation of acetyl—CoA to malonyl — CoA takes place in presence of (A) FAD+ (B) Biotin (C) NAD+ (D) NADP+
Description : A cofactor required in oxidative decarboxylation of pyruvate is (A) Lipoate (B) Pantothenic acid (C) Biotin (D) Para aminobenzoic acid
Description : The following co-enzyme is needed for the oxidative decarboxylation of ketoacids: (A) NADP+ (B) TPP (C) Folate coenzyme (D) Biotin coenzyme
Last Answer : B
Description : The first reaction in photorespiration is: (a) Decarboxylation (b) Oxygenation (c) Carboxylation (d) Phosphorylation
Last Answer : Ans. ((b))
Description : Study the pathway given below. Atmospheric CO2 mesophyll cell Bundle sheath cell Plasma- desmata Plasma membrane Cell wall HCO Phosphoenol- 3 - pyruvate Cell wall C acid ... b) Fixation Transamination Regeneration (c) Fixation Decarboxylation Regeneration (d) Carboxylation Decarboxylation Reduction
Last Answer : (c) Fixation Decarboxylation Regeneration
Description : Give examples of decarboxylation reactions.
Last Answer : Histidine to histamine; tyrosine to tyramine; tryp- tophan to tryptamine.
Description : Pantothenic acid is a constituent of coenzyme involved in (A) Acetylation (B) Decarboxylation (C) Dehydrogenation (D) Oxidation
Description : Pantothenic acid is a constituent of the coenzyme involved in (A) Decarboxylation (B) Dehydrogenation (C) Acetylation (D) Oxidation
Description : A coenzyme required in transamination reactions is (A) Coenzyme A (B) Coenzyme Q (C) Biotin (D) Pyridoxal phosphate
Description : Which of the following coenzyme takes part in hydrogen transfer reactions? (A) Tetrahydrofolate (B) Coenzyme A (C) Coenzyme Q (D) Biotin
Description : For glyburide, all of the following metabolic reactions are logical EXCEPT (A) O-demethylation (B) aromatic oxidation (C) benzylic hydroxylation (D) amide hydrolysis
Last Answer : (B) aromatic oxidation
Description : The coenzyme not involved in the formation of acetyl-CoA from pyruvate is (A) TPP (B) Biotin (C) NAD (D) FAD
Description : Enzyme involved in carboxylation in C3 cycle is -Biology
Last Answer : answer:
Description : Enzyme involved in carboxylation in C4 cycle is? -Biology
Last Answer : In C4 plants the initial carboxylation is catalyzed by PEP carboxylase (orthophos- phate: oxaloacetate carboxylase phosphorylating - E. C. 4.1. 1.
Description : Which of the following anzymes is involved in the primary carboxylation in C4 plants? (a) RUBP Carboxylase (b) PEP(c) Oxygenase (d) Carboxylase
Last Answer : (b) PEP
Last Answer : (C) Acetylation
Description : Both folic acid and methyl cobalamin (vitamin B12) are required in (A) Deamination of serine (B) Deamination of threonine (C) Conversion of pyridoxal phosphate to pyridoxamine phosphate (D) Methylation of homocystein to methionine
Description : Deamination is ______ of amino group. (A) Removal (B) Addition (C) Supplementation (D) None of these
Description : Free ammonia is released during (A) Oxidative deamination of glutamate (B) Catabolism of purines (C) Catabolism of pyrimidines (D) All of these
Description : The amino acid that undergoes oxidative deamination at significant rate is (A) Alanine (B) Aspartate (C) Glutamate (D) Glutamine
Description : The main sites for oxidative deamination are (A) Liver and kidney (B) Skin and pancreas (C) Intestine and mammary gland (D) Lung and spleen
Description : Carboxylation of acetyl-CoA to malonylCoA requires the enzyme: (A) Acetyl-CoA carboxylase (B) Pyruvate carboxylase (C) Acetyl transacylase (D) Acyl CoA-synthetase
Description : Vitamin K is a cofactor for (A) Gamma carboxylation of glutamic acid residue (B) β-Oxidation of fatty acid (C) Formation of γ-amino butyrate (D) Synthesis of tryptophan
Description : An aneplerotic reaction which sustains the availability of oxaloacetate is the carboxylation of (A) Glutamate (B) Pyruvate (C) Citrate (D) Succinate
Description : Conversion of a procarcinogen into a carcinogen often requires (A) Proteolysis (B) Microsomal hydroxylation (C) Exposure to ultraviolet radiation (D) Exposure to X-rays
Description : In renal rickets, the following hydroxylation of Vitamin D3 does not take place: (A) 25 (B) 1 (C) 24 (D) 7
Description : Hydroxylation of 25-hydroxy cholecalciferol is promoted by (A) Cytochrome A (B) Panthyroid hormone (C) Cytochrome b (D) cAMP
Description : 25-hydroxylation of Vitamin D3 takes place in (A) Liver (B) Kidneys (C) Intestines (D) Pancreas
Description : 1-hydroxylation of 25-hydroxy Vitamin D3 takes place in (A) Liver (B) Kidneys (C) Intestine (D) Pancreas
Description : In retinal rickets, the following hydroxylation of Vitamin D3 does not take place: (A) 25 (B) 1 (C) 24 (D) 7
Description : Hydroxylation of 25-hydroxy cholecalciferol is promoted by (A) Cytochrome - a (B) Parathyroid hormone (C) Cytochrome-b (D) CAMP
Description : 25-hydroxylation of vitamin D3 takes place in (A) Liver (B) Kidneys (C) Intestine (D) Pancreas