Select the drug that reversibly inhibits the enzyme
COMT and is useful as an adjuvant medication in
advanced parkinson's disease:
A. Pramipexole
B. Entacapone
C. Pergolide
D. Piribedil

1 Answer

Answer :

B. Entacapone

Related questions

Description : Select the correct statement abut donepezil: A. It is a topical carbonic anhydrase inhibitor used in glaucoma B. It is a catechol-'O'-methyl transferase inhibitor used as adjuvant in ... affords symptomatic improvement in Alzheimer's disease D. It is a synthetic cannabinoid with antiemetic property

Last Answer : C. It is a cerebroselective anticholinesterase that affords symptomatic improvement in Alzheimer's diseas

Description : The following category of drugs is not indicated in early/mild cases of Parkinson's disease: A. Central anticholinergic B. MAO-B inhibitor C. COMT inhibitor D. Nonergoline dopaminergic agonist

Last Answer : C. COMT inhibitor

Description : Choose the correct statement about topotecan: A. It is a DNA topoisomerase I inhibitor which causes single strand DNA breaks B. It is a cell cycle specific anticancer drug C. It is a COMT-inhibitor used in advanced parkinsonism D. Both 'A' and 'B' are correc

Last Answer : D. Both 'A' and 'B' are correct

Description : The following is true of selegiline: A. It does not exert antiparkinsonian action unless combined with levodopa B. It overcomes the on-off ' effect in levodopa treated advanced parkinsonian ... D. At doses used in parkinsonism it does not interfere with peripheral metabolism of dietary amines

Last Answer : . At doses used in parkinsonism it does not interfere with peripheral metabolism of dietary amines

Description : Which of the following is a disease modifying antirheumatic drug whose active metabolite inhibits the enzyme dihydro-orotate dehydrogenase: A. Leflunomide B. Nimesulide C. Sulfasalazine D. Colchicine

Last Answer : A. Leflunomide

Description : The following is true of topiramate except: A. It is a broad spectrum antiepileptic drug B. It inhibits the enzyme carbonic anhydrase C. It is used as add-on therapy in refractory partial seizures D. It is not effective in generalized tonic-clonic seizures

Last Answer : D. It is not effective in generalized tonic-clonic seizures

Description : Select the drug which directly inhibits HIV-reverse transcriptase without the need for intracellular activation by phosphorylation: A. Nelfinavir B. Nevirapine C. Stavudine D. Didanosine

Last Answer : B. Nevirapine

Description : Select the antibiotic which inhibits drug metabolizing isoenzyme CYP3A4 resulting in potentially fatal drug interaction with terfenadine: A. Erythromycin B. Clindamycin C. Gentamicin D. Vancomycin

Last Answer : A. Erythromycin

Description : Select the correct statement about ethamsylate: A. It checks capillary bleeding B. It inhibits platelet aggregation C. It is an antifibrinolytic drug D. It is used to fibrose bleeding piles

Last Answer : ut ethamsylate: A

Description : Select the drug which inhibits cyclooxygenase in the brain but not at peripheral sites of inflammation: A. Nimesulide B. Paracetamol C. Ketorolac D. Mephenamic acid

Last Answer : B. Paracetamol

Description : In which of the following conditions estrogen is not the primary drug but is added to progestin as adjuvant: A. Dysfunctional uterine bleeding B. Menopausal syndrome C. Osteoporosis D. Atrophic vaginitis

Last Answer : A. Dysfunctional uterine bleeding

Description : Select the correct statement about nitrous oxide: A. It irritates the respiratory mucosa B. It has poor analgesic action C. It is primarily used as a carrier and adjuvant to other anaesthetics D. It frequently induces post anaesthetic nausea and retching

Last Answer : C. It is primarily used as a carrier and adjuvant to other anaesthetics

Description : The principal process which terminates the action of noradrenaline released from adrenergic nerve ending is: A. Degradation by MAO B. Methylation by COMT C. Axonal uptake D. Extraneuronal uptake

Last Answer : C. Axonal uptake

Description : The following is a reversible and selective MAO-A inhibitor: A. Bupropion B. Entacapone C. Moclobemide D. Selegiline

Last Answer : C. Moclobemide

Description : The following is true about entacapone except: A. It acts by inhibiting degradation of dopamine in the brain B. If prolongs the therapeutic effect of levodopacarbidopa in parkinsonism C. It can accentuate levodopa induced dyskinesias D. It can cause diarrhoea as a side effec

Last Answer : A. It acts by inhibiting degradation of dopamine in the brain

Description : Entacapone differs from tolcapone in the following respect/respects: A. It is shorter acting B. It acts only by inhibiting peripheral metabolism of levodopa C. It is not hepatotoxic D. All of the above are correct

Last Answer : D. All of the above are correct

Description : The primary action by which entacapone and tolcapone enhance the therapeutic effect of levodopa-carbidopa in parkinsonism is: A. Inhibition of levodopa methylation in the liver B. Inhibition of ... of dopamine in the brain D. Facilitation of active transport of levodopa across brain capillaries

Last Answer : A. Inhibition of levodopa methylation in the liver

Description : The most efficacious inhibitor of catecholamine synthesis in the body is: A. α-methyl-p-tyrosine B. α-methyldopa C. α-methyl-norepinephrine D. Entacapone

Last Answer : A. α-methyl-p-tyrosine

Description : Select the drug that acts by inhibiting HIV protease enzyme: A. Zalcitabine B. Efavirenz C. Stavudine D. Nelfinavi

Last Answer : D. Nelfinavir

Description : Select the drug that is fungicidal and acts by inhibiting fungal squalene epoxidase enzyme: A. Ketoconazole B. Terbinafine C. Tolnaftate D. Hamycin

Last Answer : B. Terbinafine

Description : Trimethoprim inhibits bacteria without affecting mammalian cells because: A. It does not penetrate mammalian cells B. It has high affinity for bacterial but low affinity for mammalian dihydrofolate ... bacterial folate synthetase as well as dihydrofolate reductase enzymes D. All of the above

Last Answer : B. It has high affinity for bacterial but low affinity for mammalian dihydrofolate reductase enzyme

Description : Hydrocortisone induces the synthesis of the following protein which in turn inhibits the enzyme phospholipase-A2: A. Heat shock protein-90 B. Inhibin C. Transcortin D. Lipocortin

Last Answer : D. Lipocortin

Description : Choose the correct statement about bambuterol: A. It is an orally acting bronchodilator B. It is a prodrug C. It inhibits the enzyme pseudocholinesterase D. All of the above

Last Answer : D. All of the above

Description : The following is true of linezolid except: A. It inhibits bacterial protein synthesis at an early step B. It is active against vancomycin resistant enterococci C. It is the drug of choice for enterococcal endocarditis D. It can be administered orally as well as by i.v. infusion

Last Answer : C. It is the drug of choice for enterococcal endocarditis

Description : Compared to older tetracyclines, doxycycline produces a lower incidence of superinfection diarrhoea because: A. It is completely absorbed in the small intestines so that drug concentration in the colonic contents ... the microbes of the normal gut flora D. It is a potent tetracycline and inhibits

Last Answer : A. It is completely absorbed in the small intestines so that drug concentration in the colonic contents is low

Description : The following is true of anti-H.pylori therapy except: A. It is indicated in all patients of peptic ulcer B. Resistance to any single antimicrobial drug develops rapidly C. Concurrent ... efficacy of the regimen D. Colloidal bismuth directly inhibits H.pylori but has poor patient acceptability

Last Answer : A. It is indicated in all patients of peptic ulcer

Description : Choose the antiulcer drug that inhibits gastric acid secretion, stimulates gastric mucus and bicarbonate secretion and has cytoprotective action on gastric mucosa: A. Misoprostol B. Sucralfate C. Carbenoxolone sodium D. Colloidal bismuth subcitrate

Last Answer : A. Misoprostol

Description : The following drug increases cyclic-AMP in platelets and inhibits their aggregation without altering levels of thromboxane A2 or prostacyclin: A. Aspirin B. Sulfinpyrazone C. Dipyridamole D. Abciximab

Last Answer : C. Dipyridamole

Description : he following antidiabetic drug inhibits intestinal brush border α-glucosidase enzymes: A. Acarbose B. Pioglitazone C. Metformin D. Guargum

Last Answer : A. Acarbose

Description : Select the antibiotic which inhibits bacterial protein synthesis by interfering with translocation of elongating peptide chain from acceptor site back to the peptidyl site of the ribosome so that ... chain is prematurely terminated: A. Chloramphenicol B. Erythromycin C. Tetracycline D. Streptomycin

Last Answer : B. Erythromycin

Description : Though penicillin G kills the causative organism, it is only of adjuvant value to other measures in: A. Diphtheria B. Subacute bacterial endocarditis C. Syphilis D. Anthrax

Last Answer : A. Diphtheria

Description : Choose the correct statement about lovastatin: A. It markedly lowers plasma triglyceride with little effect on cholesterol level B. It is used as an adjuvant to gemfibrozil for type III ... hypercholesterolemia D. It is a competitive inhibitor of the rate limiting step in cholesterol synthesis

Last Answer : D. It is a competitive inhibitor of the rate limiting step in cholesterol synthesis

Description : The following is not itself an efficacious diuretic, and is used only as an adjuvant/corrective to other diuretics: A. Acetazolamide B. Metolazone C. Spironolactone D. Indapamide

Last Answer : C. Spironolactone

Description : Lugol’s iodine is used in hyperthyroidism: A. As long term definitive monotherapy B. Preoperatively for 10-15 days C. Postoperatively for 10-15 days D. As adjuvant to carbimazole for long term therap

Last Answer : B. Preoperatively for 10-15 days

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

Description : The antiparkinsonian action of central anticholinergics has the following features except: A. They control tremor more than rigidity B. They produce a low ceiling therapeutic effect C. They are effective in neuroleptic drug induced parkinsonism D. They are the preferred drugs in advanced case

Last Answer : D. They are the preferred drugs in advanced cases

Description : Select the drug which reduces cholesterol synthesis in liver, increases expression of LDL receptors on hepatocytes and has been found to reduce mortality due to coronary artery disease: A. Simvastatin B. Nicotinic acid C. Gemfibrozil D. Colestipol (

Last Answer : A. Simvastatin

Description : The shape of an enzyme and consequently its activity can be reversibly altered from moment to moment by (A) Heat (B) Amino acid substrate (C) Allosteric subunits (D) Sulfur substitutions

Last Answer : Answer : C

Description : A substance unrelated to substrate but capable of reversibly changing activity of enzyme by binding to a site other than active site is called (a) Competitive inhibitor (b) Non-competitive inhibitor (c) Catalytic inhibitor (d) Allosteric modulator/inhibitor

Last Answer : Ans. ((d))

Description : Which one of the following statements is incorrect? (a) The competitive inhibitor does not affect the rate of breakdown of the enzyme-substrate complex. (b) The presence of the competitive inhibitor ... . (d) In competitive inhibition, the inhibitor molecule is not chemically changed by the enzyme.

Last Answer : (b) The presence of the competitive inhibitor decreases the Km of the enzyme for the substrate

Description : The principles of antihypertensive drug usage enunciated in JNC VI and WHO-ISH guidelines include the following except: A. Therapy for grade I and II hypertension should be initiated with a single drug ... initially fails to lower BP, it should be replaced by a drug/combination from another class

Last Answer : C. All subjects with BP higher than 140/90 mmHg should be put on antihypertensive medication immediately

Description : The following drug is routinely used in preanaesthetic medication for prolonged operations: A. Atropine B. Morphine C. Promethazine D. Ranitidine

Last Answer : D. Ranitidine

Description : Which of the following is true of ‘placebos’: A. Placebo is a dummy medication B. Placebo is the inert material added to the drug for making tablets C. Placebos do not produce any effect D. All patients respond to placebos

Last Answer : A. Placebo is a dummy medication

Description : Select the factor which indicates that withdrawal of the successfully used antiepileptic medication is likely to result in recurrence of seizures: A. Childhood epilepsy B. Partial seizures C. Treatment started soon after seizure onset D. Absence of EEG abnormality

Last Answer : B. Partial seizures

Description : Choose the correct statement(s) about inhaled glucocorticoids in chronic obstructive pulmonary disease (COPD): A. They are indicated in COPD only for severe/ advanced cases B. Instituted early they retard the progression of COPD C. Their use predisposes to respiratory infections D. Both 'A' and 'B

Last Answer : A. They are indicated in COPD only for severe/ advanced cases

Description : Anticoagulant medication is indicated in: A. Immobilized elederly patients B. Buerger’s disease C. Stroke due to cerebral thrombosis D. All of the above

Last Answer : A. Immobilized elederly patients

Description : Which of the following is a specific inhibitor of the enzyme alcohol dehydrogenase and is useful in the treatment of methanol poisoning: A. Disulfiram B. Ethylene glycol C. Calcium leucovorin D. Fomepizole

Last Answer : D. Fomepizole

Description : Select the drug which inhibits cyclooxygenase irreversibly: A. Aspirin B. Mephenamic acid C. Naproxen D. Diclofenac

Last Answer : A. Aspirin

Description : If a drug is active against the preerythrocytic stage of the malarial parasite it will be useful as a: A. Suppressive prophylactic B. Causal prophylactic C. Clinical curative D. Radical curative

Last Answer : B. Causal prophylactic

Description : 15.45 To be a useful inhaled glucocorticoid the drug should have: A. High oral bioavailability B. Low oral bioavailability C. Additional bronchodilator activity

Last Answer : B. Low oral bioavailability