Description : Phosphofructokinase is allosterically inhibited by (A) Fructose-1, 6-biphosphate (B) Lactate (C) Pyruvate (D) Citrate
Last Answer : Answer : D
Description : Glucocorticoids increase the synthesis of all of the following except (A) Glucokinase (B) Glucose-6-phosphatase (C) Fructose-1, 6-biphosphatase (D) Pyruvate carboxylase
Last Answer : Answer : A
Description : Hyperglycemic effect of glucocorticoids is due to (A) Inactivation of protein phosphatase (B) Inactivation of fructose 1,6-biphosphatase (C) Stimulation of synthesis of pyruvate carboxylase (D) Stimulation of synthesis of eltroxykinase
Last Answer : Answer : C
Description : Which of the following is an allosteric enzyme? (A) Phosphohexose isomerase (B) Phosphotriose isomerase (C) Lactate dehydrogenase (D) Phosphofructokinase
Description : One of the enzymes regulating glycolysis is (A) Phosphofructokinase (B) Glyceraldehyde-3-phosphate dehydrogenase (C) Phosphotriose isomerase (D) Phosphohexose isomerase
Description : In glycolytic pathway, iodacetate inhibits the activity of the enzyme: (A) Phosphotriose isomerase (B) Glyceraldehyde-3-phosphate dehydrogenase (C) Pyruvate kinase (D) Phosphofructokinase
Last Answer : Answer : B
Description : Hexokinase is inhibited in an allosteric manner by (A) Glucose-6-Phosphate (B) Glucose-1-Phosphate (C) Fructose-6-phosphate (D) Fructose-1, 6-biphosphate
Description : In the figures shown below, fructose 1,6- biphosphate is located at point: (A) A (B) B (C) C (D) D
Description : Fructose 2, 3 bi phosphate is a powerful allosteric activator of (A) Fructose 1, 6 diphosphatase (B) Phosphofructokinase (C) Hexokinase (D) Fructokinase
Description : The reaction catalysed by phosphofructokinase (A) Is activated by high concentrations of ATP and citrate (B) Uses fruitose-1-phosphate as substrate (C) Is the rate-limiting reaction of the glycolytic pathway (D) Is inhibited by fructose 2, 6-bisphosphate
Last Answer : C
Description : Hemolytic anemia is caused by the deficiency of certain enzymes of the pentose phosphate pathway, the principal enzyme involved is (A) Glucose-6-phosphate dehydrogenase (B) Aldolase (C) Fructose 1, 6-bisphosphatase (D) Phosphohexose isomerase
Description : The following are true about the oxidation of glucose: a. glycolysis produces 3% of the energy ultimately obtained from glucose b. the first stage of glycolysis involves phosphorylation of glucose to 1,6-fructose biphosphate. c. glucose enters the Kreb's cycle as pyruvate d. all above
Last Answer : all above
Description : Hereditary fructose intolerance involves the absence of the enzyme: (A) Aldalose B (B) Fructokinase (C) Triokinase (D) Phosphotriose isomerase
Description : In sugarcane plant 14CO2 is fixed to malic acid, in which the enzyme that fixes CO2 is (a) ribulose biphosphate carboxylase (b) phosphoenol pyruvic acid carboxylase (c) ribulose phosphate kinase (d) fructose phosphatase.
Last Answer : (b) phosphoenol pyruvic acid carboxylase
Description : Activated phospholipase C acts on (A) Phosphatidyl inositol-4, 5-biphosphate (B) Inositol-1, 4, 5-triphosphate (C) Protein kinase C (D) Pl-3 kinase
Description : Which one of the following enzymes requires a coenzyme derived from the vitamin whose structure is shown below? (A) Enoyl CoA hydratase (B) Phosphofructokinase (C) Glucose-6-phosphatase (D) Glucose-6-phosphate dehydrogenase
Description : Pompe ’s d isease is caused due to deficiency of (A) Lysosomal α-1→4 and 1→6-glucosidase (B) Glucose-6-phosphatase (C) Glycogen synthase (D) Phosphofructokinase
Description : The enzymes involved in Phosphorylation of glucose to glucose 6- phosphate are (A) Hexokinase (B) Glucokinase (C) Phosphofructokinase (D) Both (A) and (B)
Last Answer : D
Description : McArdle’s disease is due to the deficiency of (A) Glucose-6-phosphatase (B) Phosphofructokinase (C) Liver phosphorylase (D) muscle phosphorylase
Description : Glucose-6-phosphate is an allosteric inhibitor of (A) Glucokinase (B) Hexokinase (C) Phosphohexose isomerase (D) None of these
Description : A gluconeogenic enzyme among the following is (A) Phosphofructokinase (B) Pyruvate kinase (C) Phosphoenol pyruvate carboxykinase (D) Glucokinase
Description : ATP is a co-substrate as well as an allosteric inhibitor of (A) Phosphofructokinase (B) Hexokinase (C) Glucokinase (D) None of these
Description : Tarui disease is characterized by the deficiency of the enzyme: (A) Liver phosphorylase (B) Muscle phosphorylase (C) Muscle and erythrocyte phosphofructokinase (D) Lysosomal acid maltase
Description : Dietary deficiency of thiamin inhibits the activity of the enzyme: (A) Pyruvate kinase (B) Pyruvate dehydrogenase (C) Phosphofructokinase (D) Enolase
Description : Phosphofructokinase key enzyme in glycolysis is inhibited by (A) Citrate and ATP (B) AMP (C) ADP (D) TMP
Description : Pasteur effect is (A) Inhibition of glycolysis (B) Oxygen is involved (C) Inhibition of enzyme phosphofructokinase (D) All of these
Description : The glycolysis is regulated by (A) Hexokinase (B) Phosphofructokinase (C) Pyruvate kinase (D) All of these
Description : What are the inhibitors of phosphofructokinase?
Last Answer : ATP, Citrate, Glucocorticoids.
Description : Conversion of testosterone to estradiol requires the enzyme: (A) Aromatase (B) Dehydrogenase (C) Lyase (D) Isomerase HORMONE METABOLISM 215
Description : The enzyme catalyzing conversion of androstenedione to testosterone is a (A) Oxygenase (B) Dehydrogenase (C) Isomerase (D) Decarboxylase
Description : 3-β-Hydroxysteroid dehydrogenase and ∆5,4 isomerase catalyse the conversion of the weak androgen DHEA to (A) Androstenedione (B) Testosterone (C) Progesterone (D) Estrone
Description : In the biosynthesis of cortiol, the sequence of enzymes involved is (A) Hydroxylase–dehydrogenase + isomerase – hydroxylase (B) Dehydrogenase–hydroxylase–isomerase (C) Hydroxylase–lyase–dehydrogenase isomerase (D) Isomerase–lyase–hydroxylase–dehydrogenase
Description : Urease is a (A) Lyase (B) Ligase (C) Isomerase (D) Hydrolase
Description : Pyruvate dehydrogenase is a/an (A) Isomerase (B) Lyase (C) Ligase (D) Oxido reductase
Description : In biosynthesis of cholesterol triparanol inhibits the activity of the enzyme: (A) ∆24 Reductase (B) Oxidosqualene-lanosterol cyclase (C) Isomerase (D) Squalene epoxidase ENZYMES 155
Description : Two molecules of acetyl-CoA condense to form acetoacetyl-CoA catalysed by (A) Thiolase (B) Kinase (C) Reductase (D) Isomerase
Description : Essential fructosuria is characterized by the lack of the hepatic enzyme: (A) Phosphohexose isomerase (B) Aldalose A (C) Aldolase B (D) Fructokinase
Description : The enzyme involved in essential pentosuria is (A) Reductase (B) Hydroxylase (C) Isomerase (D) Racemase
Description : An enzyme involved in gluconeogenesis is (A) Pyruvate kinase (B) Pyruvate carboxylase (C) Hexokinase (D) Phosphohexose isomerase
Description : From arachidonate, synthesis of prostaglandins is catalysed by (A) Cyclooxygenase (B) Lipoxygenase (C) Thromboxane synthase (D) Isomerase
Description : Retinol isomerase is present in (A) Retina (B) Liver (C) Both (A) and (B) (D) None of these
Description : Alkaptonuria occurs due to deficiency of the enzyme: (A) Maleylacetoacetate isomerase (B) Homogentisate oxidase (C) p-Hydroxyphenylpyruvate hydroxylase (D) Fumarylacetoacetate hydrolase
Description : Folding of newly synthesized proteins is accelerated by (A) Protein disulphide isomerase (B) Prolyl cis-trans isomerase (C) Chaperonins (D) All of these
Description : ATP is ‘wasted’ in Rapoport-Lueberring cycle in RBCs as otherwise it will inhibit (A) Phosphoglucomutase (B) Phosphohexo isomerase (C) Phosphofructo kinase (D) Phosphoenol pyruvate carboxy kinase
Description : Dihydroxyacetone phosphate and glyceraldehyde-3-phosphate are intercoverted by CARBOHYDRATES AND CARBOHYDRATE METABOLISM 13 (A) Triose isomerase (B) Phosphotriose isomerase (C) Diphosphotriose isomerase (D) Dihydroxyacetone phosphorylase
Last Answer : B
Description : What is the function of isomerase?
Last Answer : Isomerase shifts the ester bond from position 2 to 1, this is then hydrolysed by the lipase to form free glycerol and fatty acid.
Description : Give an example of isomerase.
Last Answer : Triose phosphate isomerase.
Description : An L-isomer of monosaccharide formed in human body is (A) L-fructose (B) L-Erythrose (C) L-Xylose (D) L-Xylulose
Description : Osazones are not formed with the (A) Glucose (B) Fructose (C) Sucrose (D) Lactose
Description : Which one of the following is a flocculating agent for a negatively charged drug? (A) Aluminium chloride (B) Bentonite (C) Tragacanth (D) Sodium biphosphate
Last Answer : (A) Aluminium chloride