Description : For extramitochondrial fatty acid synthesis, acetyl CoA may be obtained from (A) Citrate (B) Isocitrate (C) Oxaloacetate (D) Succinate
Last Answer : Answer : A
Description : The following enzyme is required for the hexose monophosphate shunt pathway: (A) Glucose-6-phosphatase (B) Phosphorylase (C) Aldolase (D) Glucose-6-phosphate dehydrogenase
Last Answer : D
Description : The intermediate n hexose monophosphate shunt is (A) D-Ribulose (B) D-Arabinose (C) D-xylose (D) D-Lyxose
Last Answer : A
Description : Dehydrogenase enzymes of the hexose monophosphate shunt are (A) NAD+ specific (B) NADP+ specific (C) FAD specific (D) FMN specific
Last Answer : B
Description : The intermediate in hexose monophosphate shunt is (A) D-Ribolose (B) D-Arobinose (C) D-xylose (D) D-lyxose
Description : Which is the key enzyme of hexose monophosphate shunt pathway?
Last Answer : Glucose-6-phosphate dehydrogenase.
Description : A pathway that requires NADPH as a cofactor is (A) Extramitochondrial folic acid synthesis (B) Ketone body formation (C) Glycogenesis (D) Gluconeogenesis
Description : A cofactor required for the conversion of acetyl-CoA to malonyl-CoA in extramitochondrial fatty acid synthesis is (A) Biotin (B) FMN (C) NAD (D) NADP
Description : Thiamin diphosphate is required for oxidative decarboxylation of (A) α-Keto acids (B) α-Amino acids (C) Fatty acids (D) All of these
Description : A pathway that requires NADPH as a cofactor is (A) Fatty acid oxidation (B) Extra mitochondrial denovo fatty acid synthesis (C) Ketone bodies formation (D) Glycogenesis
Last Answer : Answer : B
Description : Inhibition of photosynthesis in the presence of O2 in C3 plants is called- (1) Hexose monophosphate shunt (2) Pasteur effect (3) Decker effect (4) Warburg effect
Last Answer : (4) Warburg effect Explanation: An increase in the oxygen concentration in many plants results in a decrease in the rate of photosynthesis. This phenomenon of the inhibition of photosynthesis by O2 was first ... known to occur in C3 plants (Soyabean) and C4 plants (Sorghum, Maize, Sugarcane), etc.
Description : Inhibition of photosynthesis in the presence of O2 in C3 plants is called : (1) Hexose monophosphate shunt (2) Pasteur effect (3) Decker effect (4) Warburg effect
Last Answer : Warburg effect
Description : Epinephrine increases the concentration of free fatty acids in plasma by increasing (A) Extramitochondrial fatty acid synthesis (B) Mitochondrial fatty acid chain elongation (C) Microsomal fatty acid chain elongation (D) Lipolysis in adipose tissue
Last Answer : Answer : D
Description : The enzyme regulating extramitochondrial fatty acid synthesis is (A) Thioesterase (B) Acetyl CoA carboxylase (C) Acyl transferase (D) Multi-enzyme complex
Description : Which of the following cofactors or their derivatives must be present for the conversion of acetyl CoA to malonyl CoA extramitochondrial fatty acid synthesis? (A) Biotin (B) FAD (C) FMN (D) ACP
Description : Which of the following is required as a reductant in fatty acid synthesis? (A) NADH (B) NADPH (C) FADH2 (D) FMNH2
Description : A cofactor required in oxidative decarboxylation of pyruvate is (A) Lipoate (B) Pantothenic acid (C) Biotin (D) Para aminobenzoic acid
Description : The number of ATP produced in the oxidation of 1 molecule of NADPH in oxidative phosphorylation is (A) Zero (B) 2 (C) 3 (D) 4
Description : Among citric acid cycle enzymes, a flavoprotein is (A) Malate (B) Fumarase (C) Succinate dehrogenase (D) Isocitrate dehrogenase
Last Answer : Answer : C
Description : Fluoroacetate inhibits the reaction of citric acid cycle: (A) Isocitrate α-Ketoglutarate (B) Fumarate α-Malate (C) Citrate α-cis-aconitate (D) Succinate α-fumarate
Description : The example of generation of a high energy phosphate at the substrate level in the citric acid cycle is the reaction: (A) Isocitrate α-Ketoglutarate (B) Succinate α-fumarate (C) Malate α-oxaloacetate (D) Succinyl CoA α-Succinate
Description : An enzyme of the citric acid cycle also found outside the mitochondria is (A) Isocitrate dehydrogenase (B) Citrate synthetase (C) α-Ketoglutarate dehydrogenase (D) Malate dehydrogenase
Description : The substance which may be considered to play a catalytic role in citric acid cycle is (A) Oxaloacetate (B) Isocitrate (C) Malate (D) Fumarate
Description : Extramitochondrial synthesis of fatty acids occurs in (A) Mammary glands (B) Lungs (C) Brain (D) All of these
Description : A soluble system for synthesis of fatty acids have been isolated from avian liver, required for the formation of long chain fatty acids by this system is (A) ATP (B) Acetyl CoA (C) NADPH (D) All of these
Description : The hexose monophosphate pathway includes the enzyme: (A) Maltase dehydrogenase (B) Hexokinase (C) α-Ketoglutarate dehydrogenase (D) Glucose-6-phosphate dehydrogenase
Description : Which one of the following metabolites is not directly produced in the hexose monophosphate pathway? (A) Fructose-6-phosphate (B) Dihydroxy acetone phosphate (C) CO2 (D) Erythrose-4-phosphate
Description : NAD is required as a conenzyme in (A) Citric acid cycle (B) HMP shunt (C) β-Oxidation of fatty acids (D) Both (A) and (C)
Description : What are the sources of NADPH for fatty acid synthesis?
Last Answer : Glucose-6-phosphate dehydrogenase, malic enzyme, cytoplasmic malate dehydrogenase.
Description : What are the steps in which NADPH is used in fatty acid synthesis?
Last Answer : Step 4 (Keto acyl reductase) and Step 6 (Enoyl reductase).
Description : Malonate is an inhibitor of (A) Malate dehydrogenase (B) α-Ketoglutarate dehydrogenase (C) Succinate dehydrogenase (D) Isocitrate dehydrogenase
Description : The reaction of Kreb’s cycle which does not require cofactor of vitamin B group is (A) Citrate isocitrate (B) α -Ketoglutarate succinate (C) Malate oxaloacetate (D) Succinate fumarate
Description : The metabolism of protein is integrated with that of carbohydrate and fat through (A) Oxaloacetate (B) Citrate (C) Isocitrate (D) Malate
Description : An allosteric enzyme responsible for controlling the rate of T.C.A cycle is (A) Malate dehydrogenase (B) Isocitrate dehydrogenase (C) Fumarase (D) Aconitase
Description : Substrate level phosphorylation in TCA cycle is in step: (A) Isocitrate dehydrogenase (B) Malate dehydrogenase (C) Aconitase (D) Succinate thiokinase
Description : Which co-enzyme is not involved in oxidative decarboxylation of pyruvic acid? (A) TPP (B) Mg++ (C) Biotin (D) CoA-SH
Description : Pyruvate dehydrogenase complex and α-ketoglutarate dehydrogenase complex require the following for their oxidative decarboxylation: (A) COASH and Lipoic acid (B) NAD+ and FAD (C) COASH and TPP (D) COASH, TPP,NAD+,FAD, Lipoate
Description : NADPH is produced when this enzyme acts (A) Pyruvate dehydrogenase (B) Malic enzyme (C) Succinate dehydrogenase (D) Malate dehydrogenase
Description : β-oxidation of fatty acids is inhibited by (A) NADPH (B) Acetyl CoA (C) Malonyl CoA (D) None of these
Description : The synthesis of fatty acids is often termed reductive synthesis. (A) NADP+ (B) NADH (C) FADH2 (D) NADPH
Description : Pyruvate is converted into acetyl-CoA by (A) Decarboxylation (B) Dehydrogenation (C) Oxidative decarboxylation (D) Oxidative deamination
Description : Vitamin B1 coenzyme (TPP) is involved in (A) Oxidative decarboxylation (B) Hydroxylation (C) Transamination (D) Carboxylation
Description : Histidine is converted to histamine through the process of (A) Transamination (B) Decarboxylation (C) Oxidative deamination (D) Urea cycle
Description : The following co-enzyme is needed for the oxidative decarboxylation of ketoacids: (A) NADP+ (B) TPP (C) Folate coenzyme (D) Biotin coenzyme
Description : Oxidative decarboxylation of pyruvate requires (A) NADP+ (B) Cytichromes (C) pyridoxal phosphate (D) COASH
Description : The conversion of alanine to glucose is termed (A) Glycolysis (B) Oxidative decarboxylation (C) Specific dynamic action (D) Gluconeogenesis
Description : What are the co-enzymes necessary for oxidative decarboxylation of pyruvate?
Last Answer : Thiamine pyrophosphate, NAD, FAD, Lipoic acid, Co-enzyme A.
Description : All enzymes of TCA cycle are located in the mitochondrial matrix except one which is located in inner mitochondrial membranes in eukaryotes and in cytosol in prokaryotes. This enzyme is (a) isocitrate dehydrogenase (b) malate dehydrogenase (c) succinate dehydrogenase (d) lactate dehydrogenase.
Last Answer : (c) succinate dehydrogenase
Description : Net gain of ATP during oxidative decarboxylation of pyruvic acid? -Biology
Last Answer : answer:
Description : In gluconeogensis, an allosteric activator required in the synthesis of oxaloacetate from bicarbonate and pyruvate, which is catalysed by the enzyme pyruvate carboxylase is (A) Acetyl CoA (B) Succinate (C) Isocitrate (D) Citrate