Test
Chem
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Preguntas del test (60)
1Which of the statements is true for the given redox pairs E0Zn2+/Zn=-0.76 V E0Cu2+/Cu = +0.34 V
- ACu2+ Is the better oxidant and in a reaction with Zn2+, it will be reduced to Cu0
- BCu2+ is the better oxidant and in a reaction with Zn0, it will be reduced to Cu0
- CZn2+ is the better oxidant and in a reaction with Cu0, it will be reduced to Zn0
- DZn0 is the better oxidant and in a reaction with Cu2+, it will be oxidised to Zn2+
2What does the term Apoenzyme mean?
- Aenzyme taking part in apoptosis
- Bnonprotein part of the enzyme
- Cprotein part of the enzyme
- Denzyme having non protein part
3Pyruvic acid, acetoacetic acid and a-ketoglutaric acids are
- AAlpha keto carboxylic acids
- Bketo carboxylic acids
- Chydroxy carboxylic acid
- Dbeta keto carboxylic acids
4Nucleoside is a structure that contains
- AAlpha ribose and nitrogen base linked with 1-4 glycosidic bond
- Bbeta ribose and nitrogen base linked with glycosidic bond
- CAlpha ribose and nitrogen base linked with 1-2 glycosidic bond
- DAlpha ribose and nitrogen base linked with 1-3 glycosidic
5the secondary structure of proteins is sustained by hydrogen bonds and polypeptide chain exists as
- Adouble helix
- Ba-helix
- Clipoprotein
- Dquaternary structure
6Which is the false statement for the reaction
- Athe equation represents direct deamination of serine
- Bthe equation represents transamination of serine
- Cpyruvic acid is the final product of the reaction
- Dammonia is released as a product
7which is the correct order by increasing acidity of the following compounds
- A1-propanol, 2-propanol, glycerol, phenol
- B2-propanol 1-propanol, glycerol, phenol
- Cphenol, glycerol, 1- propanol, 2-propanol
- Dglycerol, phenol, 2-propanol, 1-propanol
8carboxylic acid reacts with
- ACu, alcohols, aldehydes and carbohydrates
- Balkali metals, alcohols, amines and amides
- Calkali metals, thioalcohols, ammonia and PCl3
- DCu, Ketones, PCl5 and triacylglycerols
9Lactic acid reacts with
- A2-aminopropane, 2-propanol, 2-pentanone
- B2-propanol, 1- aminopropane, acetanhydride
- C2- aminopropane, 2-propanol, HNO2
- D2-aminopropane, 2-propanol, NaCl
10The structure repesents
- AAlpha - D - Glucose
- BBeta - D - Mannose
- CD - Mannose
- DAlpha - D - Mannose
11The reaction that are common for amino acids and amines are
- Areaction with aldehydes, acylation and neutralisation
- Breactions with aldehydes, akylation and esterification
- Creactions with HBr, acylation and decarboxylation
- Dreactions with HBr, acylation and alkylation
12For propanol, ethanal and glyceraldehyde is possible to
- Aundergo oxidation with Fehlings reagent and aldol reaction
- Bundergo oxidation with Fehlings reagent and Cannizzaro reaction
- Cundergo oxidation with Fehlings reagent and decarboxylation reaction
- Dundergo oxidation with Fehlings reagent and deamination reaction
13Which is the correct statement
- AAccording to Bronsted- Lowry base is an aton or ion having free electrol orbital
- BAccording to Bronsted- Lowry base is an aton or ion having free electron pair
- CAccording to Bronsted- Lowry base is an aton or ion which can accept a proton
- DAccording to Bronsted- Lowry base is an aton or ion which can donate a proton
14Which of the statement is true for the given reaction?
- AThe oxidising agent's oxidation number is 0
- BThe oxidising agent's oxidation number is +1
- CThe equillibrium shifts to the right
- DThe oxidising agent is H2
15Which of the following statements is false?
- AChelates are complexes which involve multidentate ligands
- BSalycylic acid and glycerol are multidenate ligands
- CMultidentateligands form more than one coordination bond with the central metal ion
- DChelates are multidentate ligands
16Which is the correct expression for the ion product constant of water
- AKw = ([H+])/([OH-])
- BKw = [OH-] . [H+]
- CKw = pH + pOH
- DpKw = [H+] . [OH-]
17The reaction of primary alkyl amine with HNO2 produces
- AUnstable diazonium salt that decomposes to nitroamine and hydrogen
- BStable diazonium salt, nitrosamine and hydrogen
- CUnstable diazonium salt that decomposes to alcohol and hydrogen
- DStable diazonium salt, alcohol and hydrogen
18Ascorbic acid, CoQH2 and cytochrom-Fe2+
- Aare buffers in the human body
- Bare reduced forms of the corresponding redox pairs
- Care oxidised forms of the corresponding redox pairs
- Denzymes
19Normaility shows
- Athe number of moles of the equivalents of the solute per 1000mL of solution
- Bthe percent of the equivalents of solute in 1000mL of solvent
- Cthe number of equivalents of the solute per 1000mL of solution
- Dthe percent of the solute in 100g or 100mL solution or solvent
20Triacylglycerols
- Aare a class of lipids that are esters of glycerol and stearic acid
- Bare a class of lipids that contain glycerol residue and fatty acid residue as structural units
- Care a class of lipids considered derivatives of isoprene
- Daren't lipids, they are heterocyclic compounds
21The activation energy is
- AHeat that is released during the reaction
- BHeat that is absorbed during the reaction
- CEnergy which is stored in ATP
- DEnergy that must be overcome in order for a chemical reaction to occur
22The following equation represents
- Areaction of oxidation, heterogenous catalysis
- Breaction of oxidation, homogenous catalysis
- Creaction of oxidation, auto-catalysis
- Dreaction of reduction, heterogenous catalysis
23Vitamin A, vitamin K and vitamin E are
- Aterpenes
- Bsteroid
- Csphingophospholipids
- Dglycerophospholipids
24Which of the following are biopolymers?
- Amaltose, starch, heparine
- Bsucrose, glucose, ribose
- Cglycogen, hyaluronic acid, amilose
- Dheparine, sucrose, amilose
25Which acid/base pair can serve as a buffer?
- AHCl04/ClO4-
- BNaH2PO4/ K2HPO4
- CHCl/Cl-
- DNaOH/ OH-
26For an acid pKa is 2,75. What is the pKb of its conjugate base?
- A10^-2.75
- B10^-11.25
- C- log 2.75
- D11.25
27Creatinuria is an abnormal condition in which
- Athere is excessive creatine in the urine
- Bthere is excessive creatinine in the urine
- Cthere is excessive phosphocreatine in the urine
- Dthere is excessive phosphocreatinine in the urine
28Competitive inhibitors
- Abind with some site other than active site
- Bbind with enzyme-substrate complex and form a complex which is catlytically inactive
- Cbind tightly to the active site
- Dform a complex in equilibrium with the enzyme thus substrate cannot be as rapidly converted to product
29Which of the following is the product formed between tyrsone and ethanol:
- AA
- BB
- CC
- DD
30Which of the statements is true for the following reactions
- AA salt is formed with the OH group, since HNO3 is a strong acid
- BIt is a substitution reaction, the main product is 2,4,6 - trinitrophenol
- CIt represents esterification, H2SO4 acting as a catalyst
- DIts represents oxidation, the product is quinone
31Which pair represents isomers with different acid-base properties?
- Aisomers don't differ on their acid-base properties
- BA
- CB
- DC
32pH of a solution of strong base is 9.5. What is the concentration of H+ in this solution
- Athere aren't hydrogen ions
- B[H+] = 1.10^-9.5
- C[H+] = 1.10^-4.5
- D[H+] = 1.10^9.5
33What is the chemical structure of insulin?
- Aa lipid connecting with peptide
- Ba peptide connecting with sugar
- Ca mono-chain peptide
- Dtwo chain peptide with disulfide bridges
34Which pair represents positional isomers?
- A2-pentanone and 3-pentanone
- B2-butanone and 3-butanone
- Cbutanal and 2-methylpropanal
- Dpentanal and 2-pentanone
35The isoionic point (the isoionic pH) of the peptide
- Ais the pH at which the concentration of the zwitterions is maximum
- Bis the pH at which the concentration of the zwitterions is minimum
- Cis the pH at which the net charge is positive
- Dthere is no correct answer
36Rhodopsin is
- Aa product of condensation between retinol and opsin and has an imine bond
- Ba product of condensation between retinal and opsin and has an amide bond
- Ca product of condensation between retinol and opsin and has an amide bond
- Da product of condensation between retinal and opsin and has an imine bond
37Monosaccharides form
- Astructural isomer - enantiomers, epimers and anomers
- Bgeometrical isomer - enantiomers, epimers and anomers
- Cstereo isomer - enantiomers, epimers and anomers
- Dfunctional isomer - enantiomers, epimers and anomers
38Which of the following is the correct expression for Kst of K2[HgI4]?
- AA
- BB
- CC
- DD
- AA
39Which vitamines serve as coenymes?
- Avitamin C, vitamin B1 and vitamin K
- Bvitamin B1, vitamin H and vitamin K
- Cvitamin B6, vitamin and vitamin K
- Dvitamin B1, vitamin B6 and vitamin B12
40Phenol and salicylic acid form chelates with Fe3+. The colour of these chelates
- Ais purple
- Bis red
- Cone is purple the other is red
- Dboth are colorless
41Which of the statements is true for the redox pair FAD/FADH2
- AIt takes part in the dehydrogenation of fatty acid
- BIt is involved in the dehydrogenation of ethanol to ethanoic acid
- CVitamin B3 is part of this redox pair
- DFADH2 is the oxidized form of this pair
42Which row contains the correct names for the following structures?
- AA) testosterone, B) glucose amine, C) creatinine, D) aniline
- BA) aldosterone, B) beta-ribose, C) creatinine, D) aniline
- CA) testosterone, B) beta-fructose, C) creatine, D) aniline
- DA) aldosterone, B) beta-ribose, C) creatine, D) aniline
43Which of the following statements are true for trimethyl amine:
- AIt is a stronger base compared to ethylamine, and will react with HNO2
- BIt is a weaker base compared to ethylamine, and will react with HNO2
- CIt is a stronger base compared to ethylamine and will not react with HNO2
- DIt is a weaker base compared to ethylamine and will not react with HNO2
44Reaction between two molecules of alfa-glucose produces
- Asucrose, which is a reducing sugar
- Blactose, which is a nonreducing sugar
- Camilose, which is a reducing sugar
- Dmaltose, which is a reducing sugar
45The reaction represents
- Adehydrogenation of acetyl CoA as part of b-oxidation
- Bhydration of fatty acid, as part of b-oxidation
- Coxidation of fatty acid, as part of b-oxidation
- Dthiolitic cleavage of tioester as part of b-oxidation
46Which of the statement is true for the following heterocyclic ring:
- AIt represents quinoline and is present in the structure atropine
- BIt represents quinoline and is present in the structure quinine
- CIt represents isoquinoline and is present in the structure papverine
- DIt represents quinoline and is present in the structure papverine
47Which of the statements is true for the given reaction?
- AIt occurs in the first step of transamination
- BIt leads to the formation of and imine and water
- CIt shows the formation of an imine between Vit B3 and methylamine
- DThe reaction occurs with the participation of the phosphate group and the product is phosphamide
48Salicylic acid forms
- Athree positional isomers
- Btwo positional isomers
- Cdoesn't form positional isomers
- Dtwo enantiomers
49Lyases
- Aare enzymes that catalyse non-hydrolytic addition or removal of groups
- Bare enzymes that catalyse synthesis of one large molecule from two smaller molecules
- Care enzymes that catalyse the hydrolysis of esters, glycosidic bonds in carbohydrates, and peptide bonds in proteins
- Dare enzymes that catalyse addition and removal of hydrogen
50Aldosterone is
- Amineral corticoid,causes kidney tubules to reabsorb Na+, Cl- and HCO3
- Ba male sex hormone
- Ca female sex hormone
- Dbiogenic amine
51Does the equation represent the reaction between a base and the acetate buffer?
- Ayes, it correctly represent the reaction
- Bno, the products are acetic acid and water
- Cno, the acetate ion does not react with the added base
- Dno, the acetate ion is not part of the acetate buffer
52Which of the following statements is true:
- AImidazole is a 5 membered ring present in the structure of trytophan
- BIndole is fused ring present in the structure of the alkaloid papaverine
- CIndole is a fused ring present in the structure of tryptophan
- DImidazole is a 5 membered ring present in the structure of antipyretics
53<-
- A[Cu(NH3)4]^2+ because it is more stable
- B[Cu(NH3)4]^2+ because it is less stable
- C[Cu(CN)4]^2- because it is more stable
- D[Cu(CN)4]^2- because it is less stable
54Which row represents the conjugate species of the given bases? CH3NH2, OH-, HCO3-, H2NCH2COO-
- AA
- BB
- CC
- DD
55Choose the aldehyde that would participate in the Cannizarro reaction
- A2,2 - dimethylbutanal
- B2-methylbutanal
- C2,3-dimethylbutanal
- D3,3-dimethylbutanal
56The name methyl salicylate is referred to
- Aan acid chloride of salicylic acid
- Ba salt of salicylic acid
- Can ester of salicylic acid formed with its hydroxyl group
- Dan ester of salicylic acid formed with its carboxyl group
57Caffeine is a central nervous system stimulator and it has as structural unit
- Aquinoline
- Bimidazole
- Cpurine
- Disoquinoline
58Arrhenius equation gives the relation between the rate constant and activation energy and temperature. According to the equation
- Arate constant is directly proportional to the activation energy
- Brate constant is directly proportional to the temperature
- Crate constant is reversely proportional to the activation energy and temperature
- Drate constant is directly proportional to the activation energy and temperature
59Which of the following fatty acids is natural
- ACH3 - (CH2)13 - CH2 - COOH
- BCH3 - (CH2)14 - CH2 - COOH
- CCH3 - (CH2)16 - CH2 - COOH
- DCH3 - (CH2)18 - CH2 - COOH
60Which test can be used to prove presence of methionine in a polypeptide chain?
- Alead-sulfide reaction
- Blegals test
- Cninhydrin reaction
- Dbiuret test
Información
- Descripción
- Test sobre Chem, creado por lu lucy el 22/09/2020.
- Autor
- lu lucy
- Idioma
- English
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