Activity of cytochrome oxidase is inhibited by (A) Sulphite (B) Sulphate (C) Arsenite (D) Cyanide

Activity of cytochrome oxidase is inhibited by (A) Sulphite (B) Sulphate (C) Arsenite (D) Cyanide
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An example of competitive inhibition of an enzyme is the inhibition of a. Succinic dehydrogenase by malonic acid b. Cytochrome oxidase by cyanide c. Hexokinase by glucose-6-phosphate d. Carbonic anhydrase by carbon dioxide

Description : An example of competitive inhibition of an enzyme is the inhibition of a. Succinic dehydrogenase by malonic acid b. Cytochrome oxidase by cyanide c. Hexokinase by glucose-6-phosphate d. Carbonic anhydrase by carbon dioxide

Last Answer : Ans: A

Air can oxidize sodium sulphite in eq. solution but cannot do so in the case of sodium arsenite. If however, air is passed through a solution containi

Description : Air can oxidize sodium sulphite in eq. solution but cannot do so in the case of sodium arsenite. If however, air is passed through a solution containi

Last Answer : Air can oxidize sodium sulphite in eq. solution but cannot do so in the case of sodium ... Negative catalysis C. Induced catalysis D. Auto catalysis

Formation of succinyl-CoA from α-Ketoglutarate is inhibited by (A) Fluoroacetate (B) Arsenite (C) Fluoride (D) Iodoacetate

Description : Formation of succinyl-CoA from α-Ketoglutarate is inhibited by (A) Fluoroacetate (B) Arsenite (C) Fluoride (D) Iodoacetate

Last Answer : Answer : B

Molybdenum is a cofactor for (A) Xanthine oxidase (B) Aldehyde oxidase (C) Sulphite oxidase (D) All of these

Description : Molybdenum is a cofactor for (A) Xanthine oxidase (B) Aldehyde oxidase (C) Sulphite oxidase (D) All of these

Last Answer : Answer : D

An example of feedback inhibition is (A) Allosteric inhibition of hexokinase by glucose6-phosphate (B) Cyanide action on cytochrome (C) Sulpha drug on folic acid synthesizer bacteria (D) Reaction between succinic dehydrogenase and succinic acid

Description : An example of feedback inhibition is (A) Allosteric inhibition of hexokinase by glucose6-phosphate (B) Cyanide action on cytochrome (C) Sulpha drug on folic acid synthesizer bacteria (D) Reaction between succinic dehydrogenase and succinic acid

Last Answer : Answer : A

Synthesis of prostaglandinsis is inhibited by (A) Aspirin (B) Arsenic (C) Fluoride (D) Cyanide

Description : Synthesis of prostaglandinsis is inhibited by (A) Aspirin (B) Arsenic (C) Fluoride (D) Cyanide

Last Answer : A

Cytochrome oxidase contains (A) Cu2+ and Zn2+ (B) Cu2+ and Fe2+ (C) Cu2+ and Mn2+ (D) Cu2+

Description : Cytochrome oxidase contains (A) Cu2+ and Zn2+ (B) Cu2+ and Fe2+ (C) Cu2+ and Mn2+ (D) Cu2+

Last Answer : Answer : B

A copper containing oxidase is (A) Cytochrome oxidase (B) Flavin mononucleotide (C) Flavin adenine dinucleotide (D) Xanthine oxidase

Description : A copper containing oxidase is (A) Cytochrome oxidase (B) Flavin mononucleotide (C) Flavin adenine dinucleotide (D) Xanthine oxidase

Last Answer : Answer : A

A molybdenum containing oxidase is (A) Cytochrome oxidase (B) Xanthine oxidase (C) Glucose oxidase (D) L-Amino acid oxidase

Description : A molybdenum containing oxidase is (A) Cytochrome oxidase (B) Xanthine oxidase (C) Glucose oxidase (D) L-Amino acid oxidase

Last Answer : Answer : B

All of the following are iron-containing enzymes except (A) Carbonic anhydrase (B) Catalase (C) Peroxidase (D) Cytochrome oxidase

Description : All of the following are iron-containing enzymes except (A) Carbonic anhydrase (B) Catalase (C) Peroxidase (D) Cytochrome oxidase

Last Answer : Answer : A

The pentose phosphate pathway protects erythrocytes against hemolysis by assisting the enzyme: (A) Superoxide dismutase (B) Catalase (C) Glutathionic peroxidase (D) Cytochrome oxidase ENZYMES 149

Description : The pentose phosphate pathway protects erythrocytes against hemolysis by assisting the enzyme: (A) Superoxide dismutase (B) Catalase (C) Glutathionic peroxidase (D) Cytochrome oxidase ENZYMES 149

Last Answer : Answer : C

The enzyme using some other substance, not oxygen as hydrogen acceptor is (A) Tyrosinase (B) Succinate dehydrogenase (C) Uricase (D) Cytochrome oxidase

Description : The enzyme using some other substance, not oxygen as hydrogen acceptor is (A) Tyrosinase (B) Succinate dehydrogenase (C) Uricase (D) Cytochrome oxidase

Last Answer : Answer : B

An enzyme catalyzing oxidoreduction, using oxygen as hydrogen acceptor is (A) Cytochrome oxidase (B) Lactate dehydrogenase (C) Malate dehydrogenase (D) Succinate dehydrogenase

Description : An enzyme catalyzing oxidoreduction, using oxygen as hydrogen acceptor is (A) Cytochrome oxidase (B) Lactate dehydrogenase (C) Malate dehydrogenase (D) Succinate dehydrogenase

Last Answer : Answer : A

Example of an extracellular enzyme is (A) Lactate dehydrogenase (B) Cytochrome oxidase (C) Pancreatic lipase (D) Hexokinase

Description : Example of an extracellular enzyme is (A) Lactate dehydrogenase (B) Cytochrome oxidase (C) Pancreatic lipase (D) Hexokinase

Last Answer : Answer : C

Which of the following is located in the mitochondria? (A) Cytochrome oxidase (B) Succinate dehydrogenase (C) Dihydrolipoyl dehydrogenase (C) All of these

Description : Which of the following is located in the mitochondria? (A) Cytochrome oxidase (B) Succinate dehydrogenase (C) Dihydrolipoyl dehydrogenase (C) All of these

Last Answer : D

Destruction of which of the following enzyme causes cyanide poisoning (a) Zymogen (b) Cytochrome enzyme (c) Urease (d) None of these

Description : Destruction of which of the following enzyme causes cyanide poisoning (a) Zymogen (b) Cytochrome enzyme (c) Urease (d) None of these

Last Answer : (b) Cytochrome enzyme

Synthesis of prostaglandinsis is inhibited by (A) Aspirin (B) Arsenic (C) Fluoride (D) Cyanide

Description : Synthesis of prostaglandinsis is inhibited by (A) Aspirin (B) Arsenic (C) Fluoride (D) Cyanide

Last Answer : (A) Aspirin

Cytochrome C oxidase complex contains cyto-a & `a_(3)` and two copper centres.

Description : Cytochrome C oxidase complex contains cyto-a & `a_(3)` and two copper centres.

Last Answer : Cytochrome C oxidase complex contains cyto-a & `a_(3)` and two copper centres.

Cytochrome C oxidase complex contains cyto-a & `a_(3)` and two copper centres.

Description : Cytochrome C oxidase complex contains cyto-a & `a_(3)` and two copper centres.

Last Answer : Cytochrome C oxidase complex contains cyto-a & `a_(3)` and two copper centres.

Copper is associated with _____ mitochondria' enzymes. (1) Cytochrome oxidase (2) Succinic dehydrogenase (3) Catalase (4) Acid phosphatase

Description : Copper is associated with _____ mitochondria' enzymes. (1) Cytochrome oxidase (2) Succinic dehydrogenase (3) Catalase (4) Acid phosphatase

Last Answer : (1) Cytochrome oxidase Explanation: Copper is involved in normalized function of many enzymes, such as cytochrome oxidase, which is complex IV in mitochondrial electron ... transportation, antioxidant and free radical scavenging and neutralization, and neurotransmitter synthesis, respectively.

Which of the following is located in the mitochondria? (A) Cytochrome oxidase (B) Succinate dehydrogenase (C) Dihydrolipoyl dehydrogenase (D) All of these

Description : Which of the following is located in the mitochondria? (A) Cytochrome oxidase (B) Succinate dehydrogenase (C) Dihydrolipoyl dehydrogenase (D) All of these

Last Answer : (D) All of these

Copper is associated with ____ mitochondrial enzymes. (1) Cytochrome oxidase (2) Succinic dehydrogenase (3) Catalase (4) Acid phosphatase

Description : Copper is associated with ____ mitochondrial enzymes. (1) Cytochrome oxidase (2) Succinic dehydrogenase (3) Catalase (4) Acid phosphatase

Last Answer : Cytochrome oxidase

The following is not true of the cytochrome P450 isoenzyme CYP2D6: A. It generates the hepatotoxic metabolite N-acetyl benzoquinone immine from paracetamol B. It is involved in demethylation of codeine into morphine C. Its altered form is responsible for poor capacity to hydroxylate many drugs including metoprolol D. It is inhibited by quinidine

Description : The following is not true of the cytochrome P450 isoenzyme CYP2D6: A. It generates the hepatotoxic metabolite N-acetyl benzoquinone immine from paracetamol B. It is involved in demethylation of ... for poor capacity to hydroxylate many drugs including metoprolol D. It is inhibited by quinidine

Last Answer : A. It generates the hepatotoxic metabolite N-acetyl benzoquinone immine from paracetamol

The following is not true of the cytochrome P450 isoenzyme CYP2D6: A. It generates the hepatotoxic metabolite N-acetyl benzoquinone immine from paracetamol B. It is involved in demethylation of codeine into morphine C. Its altered form is responsible for poor capacity to hydroxylate many drugs including metoprolol D. It is inhibited by quinidine

Description : The following is not true of the cytochrome P450 isoenzyme CYP2D6: A. It generates the hepatotoxic metabolite N-acetyl benzoquinone immine from paracetamol B. It is involved in demethylation of ... for poor capacity to hydroxylate many drugs including metoprolol D. It is inhibited by quinidine

Last Answer : A. It generates the hepatotoxic metabolite N-acetyl benzoquinone immine from paracetamo

Doctor's solution used for sweetening of petroleum products is (A) Sodium plumbite (B) Sodium sulphite (C) Sodium thiosulphate (D) Lead sulphate

Description : Doctor's solution used for sweetening of petroleum products is (A) Sodium plumbite (B) Sodium sulphite (C) Sodium thiosulphate (D) Lead sulphate

Last Answer : (A) Sodium plumbite

Out of the following processes of paper pulp manufacture, the maximum corrosion problem in digestion & handling equipments is encountered in the __________ process. (A) Mechanical (B) Sulphate/Kraft (C) Sulphite (D) Neutral sulphite semi-chemical

Description : Out of the following processes of paper pulp manufacture, the maximum corrosion problem in digestion & handling equipments is encountered in the __________ process. (A) Mechanical (B) Sulphate/Kraft (C) Sulphite (D) Neutral sulphite semi-chemical

Last Answer : (D) Neutral sulphite semi-chemical

Comparing sulphate process with sulphite process, we find that __________ in the later. (A) Both temperature & pressure in the former is less than that (B) Both temperature & pressure in the former is more than that (C) Temperature is more in the former whereas pressure is more(D) Pressure is more in the former whereas temperature is less

Description : Comparing sulphate process with sulphite process, we find that __________ in the later. (A) Both temperature & pressure in the former is less than that (B) Both temperature & pressure in the former ... the former whereas pressure is more (D) Pressure is more in the former whereas temperature is less

Last Answer : (B) Both temperature & pressure in the former is more than that

Pick out the wrong statement. (A) Kraft method of pulp manufacture can process all types of fibrous raw materials (B) Digestion time for bagasse is less than that for wood base materials (C) Both temperature and pressure in the digestor is less in case of the sulphite method as compared to that in the sulphate method (D) None of these

Description : Pick out the wrong statement. (A) Kraft method of pulp manufacture can process all types of fibrous raw materials (B) Digestion time for bagasse is less than that for wood base materials (C) Both ... in case of the sulphite method as compared to that in the sulphate method (D) None of these

Last Answer : (D) None of these

The most economical pulp for the production of newsprint would be the __________ pulp. (A) Ground-wood (B) Sulphate (C) Sulphite (D) Semi-chemical

Description : The most economical pulp for the production of newsprint would be the __________ pulp. (A) Ground-wood (B) Sulphate (C) Sulphite (D) Semi-chemical

Last Answer : (A) Ground-wood

Cooking liquor in case of sulphite process is (A) Sodium sulphite and sodium bisulphite (B) Magnesium sulphite and free SO2 in acid medium (C) Magnesium sulphate and magnesium bicarbonate (D) None of these

Description : Cooking liquor in case of sulphite process is (A) Sodium sulphite and sodium bisulphite (B) Magnesium sulphite and free SO2 in acid medium (C) Magnesium sulphate and magnesium bicarbonate (D) None of these

Last Answer : (A) Sodium sulphite and sodium bisulphite

Which is a high grade pulp? (A) Rag pulp(B) Mechanical pulp(C) Sulphate pulp(D) Sulphite pulp

Description : Which is a high grade pulp? (A) Rag pulp (B) Mechanical pulp (C) Sulphate pulp (D) Sulphite pulp

Last Answer : (C) Sulphate pulp

A specific inhibitor for succinate dehydrogenase is (A) Arsenite (B) Malonate (C) Citrate (D) Fluoride

Description : A specific inhibitor for succinate dehydrogenase is (A) Arsenite (B) Malonate (C) Citrate (D) Fluoride

Last Answer : Answer : B

A specific inhibitor for succinate dehydrogenase is (A) Arsenine (B) Arsenite (C) Citrate (D) Fluoride ENZYMES 147

Description : A specific inhibitor for succinate dehydrogenase is (A) Arsenine (B) Arsenite (C) Citrate (D) Fluoride ENZYMES 147

Last Answer : Answer : B

Calcium salts used as fertilizer is – (1) Calcium Carbide (2) Calcium Carbonate (3) Calcium Cyanide (4) Calcium Sulphate

Description : Calcium salts used as fertilizer is – (1) Calcium Carbide (2) Calcium Carbonate (3) Calcium Cyanide (4) Calcium Sulphate

Last Answer : (4) Calcium Sulphate Explanation: Sulphur (as sulphate) is a major plant nutrient, and is essential for crop growth. Calcium Sulphate (gypsum) is used to improve soil quality. Calcium sulphate ... It is mainly used for the reclamation of sodic soils through ion exchange (calcium replacing sodium).

Calcium salts used as fertilizer is : (1) Calcium Carbide (2) Calcium Carbonate (3) Calcium Cyanide (4) Calcium Sulphate

Description : Calcium salts used as fertilizer is : (1) Calcium Carbide (2) Calcium Carbonate (3) Calcium Cyanide (4) Calcium Sulphate

Last Answer :  Calcium Sulphate

A deficiency of copper effects the formation of normal collagen by reducing the activity of which of the following enzyme? (A) Prolyl hydroxylase (B) Lysyl oxidase (C) Lysyl hydroxylase (D) Glucosyl transferase

Description : A deficiency of copper effects the formation of normal collagen by reducing the activity of which of the following enzyme? (A) Prolyl hydroxylase (B) Lysyl oxidase (C) Lysyl hydroxylase (D) Glucosyl transferase

Last Answer : Answer : B

All the following statements about ceruloplasmin are correct except (A) It is a copper-containing protein (B) It possesses oxidase activity (C) It is synthesised in intestinal mucosa (D) Its plasma level is decreased inWilson’s disease

Description : All the following statements about ceruloplasmin are correct except (A) It is a copper-containing protein (B) It possesses oxidase activity (C) It is synthesised in intestinal mucosa (D) Its plasma level is decreased inWilson’s disease

Last Answer : Answer : C

The deficiency of copper decreases the activity of the enzyme: (A) Lysine oxidase (B) Lysine hydroxylase (C) Tyrosine oxidase (D) Proline hydroxylase

Description : The deficiency of copper decreases the activity of the enzyme: (A) Lysine oxidase (B) Lysine hydroxylase (C) Tyrosine oxidase (D) Proline hydroxylase

Last Answer : Answer : A

The activity of mammalian L-amino acid oxidase, an FMN – flavo protein, is quite (A) Slow (B) Rapid (C) Both (A) and (B) (D) None of these

Description : The activity of mammalian L-amino acid oxidase, an FMN – flavo protein, is quite (A) Slow (B) Rapid (C) Both (A) and (B) (D) None of these

Last Answer : Answer : A

Activity of ceruloplasmin shown in vitro: (A) Reductase (B) Hydrolase (C) Ligase (D) Oxidase

Description : Activity of ceruloplasmin shown in vitro: (A) Reductase (B) Hydrolase (C) Ligase (D) Oxidase

Last Answer : Answer : D

Peptidyl transferase activity of 50 S ribosomal subunits is inhibited by (A) Rifampicin (B) Cycloheximide (C) Chloramphenicol (D) Erythromycin

Description : Peptidyl transferase activity of 50 S ribosomal subunits is inhibited by (A) Rifampicin (B) Cycloheximide (C) Chloramphenicol (D) Erythromycin

Last Answer : Answer : C

The activity of HMG-CoA reductase is inhibited by (A) A fungal inhibitor mevastatin (B) Probucol (C) Nicotinic acid (D) Clofibrate

Description : The activity of HMG-CoA reductase is inhibited by (A) A fungal inhibitor mevastatin (B) Probucol (C) Nicotinic acid (D) Clofibrate

Last Answer : Answer : A

Pyruvate dehydrogenase activity is inhibited by (A) Mercury (B) Zinc (C) Calcium (D) Sodium

Description : Pyruvate dehydrogenase activity is inhibited by (A) Mercury (B) Zinc (C) Calcium (D) Sodium

Last Answer : Answer : A

All of the following statements about the enzymic complex that carries out the synthesis of ATP during oxidative phosphorylation are correct except (A) It is located on the matrix side of the inner mitochondrial membrane (B) It is inhibited by oligomycin (C) It can exhibit ATPase activity (D) It can bind molecular O2

Description : All of the following statements about the enzymic complex that carries out the synthesis of ATP during oxidative phosphorylation are correct except (A) It is located on the matrix side of the inner ... inhibited by oligomycin (C) It can exhibit ATPase activity (D) It can bind molecular O2

Last Answer : D

Many xenobiotics are oxidized by cytochrome P450 in order to (A) increase their biological activity (B) increase their disposition in lipophilic compartments of the body (C) increase their aqueous solubility (D) all of the above

Description : Many xenobiotics are oxidized by cytochrome P450 in order to (A) increase their biological activity (B) increase their disposition in lipophilic compartments of the body (C) increase their aqueous solubility (D) all of the above

Last Answer : (D) all of the above

At the adrenergic synapse, the concentration of adrenaline in synaptic cleft: a. increased by cocaine which inhibit reuptake of adrenaline b. decreased by MAO (monoamine oxidase) - inhibitors c. controlled chiefly by the activity of the enzyme COMT d. increased by noradrenaline receptor blockers

Description : At the adrenergic synapse, the concentration of adrenaline in synaptic cleft: a. increased by cocaine which inhibit reuptake of adrenaline b. decreased by MAO (monoamine oxidase) - inhibitors c. controlled chiefly by the activity of the enzyme COMT d. increased by noradrenaline receptor blockers

Last Answer : increased by cocaine which inhibit reuptake of adrenaline

Which of the following categories of medications may result in seizure activity if withdrawn suddenly? a) Tranquilizers Abrupt withdrawal of tranquilizers may result in anxiety, tension, and even seizures if withdrawn suddenly. b) Adrenal corticosteroids Abrupt withdrawal of steroids may precipitate cardiovascular collapse. c) Antidepressants Monoamine oxidase inhibitors increase the hypotensive effects of anesthetics. d) Diuretics Thiazide diuretics may cause excessive respiratory depression during anesthesia due to an associated electrolyte imbalance.

Description : Which of the following categories of medications may result in seizure activity if withdrawn suddenly? a) Tranquilizers Abrupt withdrawal of tranquilizers may result in anxiety, tension, ... may cause excessive respiratory depression during anesthesia due to an associated electrolyte imbalance.

Last Answer : a) Tranquilizers Abrupt withdrawal of tranquilizers may result in anxiety, tension, and even seizures if withdrawn suddenly.

Choose the correct statement about allopurinol: A. It is a purine antimetabolite with antineoplastic activity B. It is a competitive inhibitor of xanthine oxidase C. It is inactive itself, but its metabolite alloxanthine is a competitive inhibitor of xanthine oxidase D. Both allopurinol as well as its metabolite alloxanthine are noncompetitive inhibitors of xanthine oxidase

Description : Choose the correct statement about allopurinol: A. It is a purine antimetabolite with antineoplastic activity B. It is a competitive inhibitor of xanthine oxidase C. It is inactive itself ... D. Both allopurinol as well as its metabolite alloxanthine are noncompetitive inhibitors of xanthine oxidase

Last Answer : B. It is a competitive inhibitor of xanthine oxidase

Auxin destruction activity is inhibited by : a. Blue light b. Red light c. Green light d. None of the above

Description : Auxin destruction activity is inhibited by : a. Blue light b. Red light c. Green light d. None of the above

Last Answer : Red light

Which statement is NOT correct about PTH? A) When calcium level rises, PTH secretion is inhibited. B) When calcium level lowers, PTH secretion is stimulated. C) PTH has the opposite effect of calcitonin. D) PTH stimulates calcium absorption from the gut. E) PTH decreases the activity of osteoclasts.

Description : Which statement is NOT correct about PTH? A) When calcium level rises, PTH secretion is inhibited. B) When calcium level lowers, PTH secretion is stimulated. C) PTH has the opposite effect of ... . D) PTH stimulates calcium absorption from the gut. E) PTH decreases the activity of osteoclasts.

Last Answer : E) PTH decreases the activity of osteoclasts.