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3251.

which of the following are basic amino acids?A. Glycine and alanineB. Lysine and arginineC. Glutamic acid and aspartic acidD. Histidine and proline

Answer» Correct Answer - B
3252.

DNA duplication occurs atA. Meiosis -IIB. Mitotic interphaseC. Mitosis onlyD. Meiosis and mitosis both

Answer» Correct Answer - D
3253.

A DNA molecule in which both strands have radioactive thymidine is allowed to duplicate in an environment containing non- radioactive thymidine. What will be the exact number of DNA molecules that contains the radio active thymidine after 3 duplications -A. oneB. twoC. fourD. Eight

Answer» Correct Answer - D
3254.

Precursor of niacin isA. lysineB. theronineC. trytophanD. glycoine

Answer» Correct Answer - C
3255.

A : Hormones are not enzymes, but they can stimulate the release of enzymes. R : Hormones are used up in metabolism, but enzymes can act over and over again.A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1).B. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2).C. If Assertion is true statements but Reason is false, then mark (3).D. If both Assertion and Reason are false statements, then mark (4)

Answer» Correct Answer - B
3256.

Insulin production and its action in human body are responsible for the level of diabetes. This compound belongs to which of the following catefories:A. A coenzymeB. A hormoneC. An enzymeD. An antibiotic

Answer» Correct Answer - B
3257.

The helical structure of protein is stabilised by:A. glycosidic bondsB. dipeptide bondsC. hydrogen bondsD. all of these

Answer» Correct Answer - C
3258.

The helical structure of protein is stabilised by:A. peptide bondsB. dipeptide bondsC. `H-`bondD. ether bonds

Answer» Correct Answer - C
Proteins are stabilized by `H-` bonding.
3259.

The helical structure of protein is stabilised by:A. Dipeptide bondsB. Hydrogen bondsC. Ether bondsD. Peptide bonds

Answer» Correct Answer - B
Keratin, a fibrous protein found in wool, hair, fingernails, and feathers wraps into a helical coil, much like the cord on a telephone. Called an alpha `(alpha-)-` helix, this secondary structure is stablized by the formation of hydrogen bonds between the `N - H` group of one amino acid and the `C = O` group of another amino acid four residues with a distance between turns of `0.54 nm`.
3260.

The helical structure of protein is stabilised by:A. ionic bondB. covalent bondC. Vander Waals forcesD. hydrogen bond

Answer» Correct Answer - D
3261.

Which of the following chemicals can be added for sweetening of food item at cooking temperature and does not provide calories?A. sucroseB. glucoseC. AspartameD. Sucralose

Answer» Correct Answer - D
Sucralose does not decompose while aspertame does all the cooking temperature.
3262.

Substane which bring body temperature down are known asA. AntipyreticsB. AnalgesicsC. AntibioticsD. Hypnotics

Answer» Correct Answer - A
Substances which bring down body temperature are called antipyretics.
3263.

Which of the following can possibly be used as analgesic without causing addiction and modification?A. morphineB. N-Acety -para-aminophenolC. DiazepamD. Tetrahydrocannabinol

Answer» Correct Answer - B
`N`- Acetyl-para-aminophenol is the chemical name of paracetamol.
3264.

Which of the following can possibly to used as analgesic without causing addiction and mood modification?A. MorphineB. DiazepamC. TetrahydrocationalD. N-acetyl-para-aminophenol

Answer» Correct Answer - D
N-acetyle-para-aminophenol or paracetamol is used as analgesic as well as antipyretic.
3265.

Teflon is a polymer of the monomer or Teflon is obtained by the polymerisation ofA. monofluoroetheneB. difluoroentheneC. trifluoroetheneD. tetraflurorethene

Answer» Correct Answer - D
Tetrafluoroethene `(CF_(2)=CF_(2))`.
3266.

Orlon is a polymer ofA. styreneB. tetrafluoro ethyleneC. vinyl chlorideD. acrylonitrile

Answer» Correct Answer - D
Acrylonitrile is a hard, horny and high melting material. It is used in the manufacturer of orlon and Acrilan fibres which are used for making clothes, carpets and blankets.
3267.

The compound required foor the formation of a thermosetting poluymer with methanol isA. benzeneB. pheny aminoC. benzaldehydeD. phenol

Answer» Correct Answer - C
When phenol reacts with `HCHO`, forms bakelite which is a thermosetting polymer.
3268.

An antibiotic effective in treatment of pneumonia, bronchitis etc. isA. PenicillinB. PatulinC. ChloromycetinD. Chloramphenicol

Answer» Correct Answer - C
Chloromycetin is effective in treatment of pneumonia, bronchitis etc.
3269.

In disaccharide and poly saccharides two or more monosaccharides units are held together byA. acetal bondB. glycosidic linkageC. ether linkageD. all of these

Answer» Correct Answer - D
3270.

Carbohydrates are classified on the basis of their bahaviour on hydrolysis and also as reducing or non-reducing sugar. Sucrose is a ............ .A. monosaccharideB. disaccharideC. reducing sugarD. non-reducing sugar

Answer» Correct Answer - B::D
3271.

Write the major classes in which carbohydrates are classified based upon hydrolysis.

Answer» There are three main classes. These are : monosaccharides, oligosaccharides and polysaccharides.
3272.

Number of sugar units in oligo saccharides are ……(a) 6 to 10 (b) 1 to 10 (c) 2 to 8 (d) 2 to 10

Answer»

Number of sugar units in oligo saccharides are 2 to 10.

3273.

Aldehydes ahd ketones are converted to acetals by treatment with an alcohol and a trace of acid catalyst. These conditions also convert aldoses and ketoses to the acetals, call glycosides. In glycosides, an aglycone is the group bonded to the anomeric carbon atom. Example : Methanol is the aglycone in a methyl glycoside. In sucrose, two menosaccharides unit liked by A. Only `beta`-glycosidic linkage is presentB. Only `alpha`-glycosidic linkage is presentC. `alpha`-glycosidic linkage on glucose and `beta`-glycosidic linkage on fructoseD. `beta`-glycosidic linkage on fructose and `alpha`-glycosidic linkage on glucose

Answer» Correct Answer - B
3274.

Carbohydrates are polyhydroxy aldehydes or ketones or substances which generally give these upon hydrolysis. These have been classified as mono, oligo or polysaccharides. These are all optically active since they contain number of chiral carbon atoms in their molecules. Further, the carbohydrates may be either reducing or non-reducing in nature. In disaccharides and polysaccharides, the monosaccharides are linked to each other by Glycosidic linkages. Which of the following given the same osazone ?A. Glucose, FructoseB. Glucose, GalactoseC. Maltose, LactoseD. Sucrose, Fructose

Answer» Correct Answer - A
Both form the same osazone.
3275.

Which of the following compound can not show haloform reation ?A. B. C. D. `PhCH_(2)-overset(O)overset(||)(C)-CH_(3)`

Answer» Correct Answer - d
3276.

All proteins are made up of `alpha`-amino acids which act as the building blocks. `alpha`-amino acids that are synthesised in the body, are known as non-essential `alpha`-amino acids while the one which the body fails to synthesise, are called essential `alpha`-amino acids. All of them exist as dipolar ions also known as Zwitterions. For all the `alpha`-amino acids, there is a certain pH of the medium known as isoelectric point at which the dipolar ions behave as electrically neutral species. In acidic medium, the ion migrates towards cathos while in basic medium, it migrates towards anode on passing electric current. The isoelectric point of an amino acid isA. the pH at which it exists in basic formB. the pH at which it exists in acidic formC. the pH at which it exists in zwitterion formD. the pH equal to its Pka.

Answer» Correct Answer - C
3277.

One of the different amino acids which can be synthesised in the body is:A. AlanineB. LysineC. ValineD. Histidine

Answer» Correct Answer - A
Except alanine, all amino acids are essential amino acids which cannot be synthesised in the body and must be obtained through diet.
3278.

Carbohydrates are polyhydroxy aldehydes or ketones or substances which generally give these upon hydrolysis. These have been classified as mono, oligo or polysaccharides. These are all optically active since they contain number of chiral carbon atoms in their molecules. Further, the carbohydrates may be either reducing or non-reducing in nature. In disaccharides and polysaccharides, the monosaccharides are linked to each other by Glycosidic linkages. In the polysacharides, the monosaccharides are linked to each other by :A. Glyosidic LinkageB. Peptide LinkageC. Nucleosidic LinkageD. None is correct

Answer» Correct Answer - A
Glycosidic linkage is present in monosaccharides.
3279.

Which of the following will give white ppt. with aq.`AgNO_(3)` ?A. Ph-ClB. C. `Ph-CH_(2)-I`D. `H_(2)-CH_(2)CH_(2)CH_(2)CH_(2)-Cl`

Answer» Correct Answer - d
3280.

All proteins are made up of `alpha`-amino acids which act as the building blocks. `alpha`-amino acids that are synthesised in the body, are known as non-essential `alpha`-amino acids while the one which the body fails to synthesise, are called essential `alpha`-amino acids. All of them exist as dipolar ions also known as Zwitterions. For all the `alpha`-amino acids, there is a certain pH of the medium known as isoelectric point at which the dipolar ions behave as electrically neutral species. In acidic medium, the ion migrates towards cathos while in basic medium, it migrates towards anode on passing electric current. Which of the following is not an essential `alpha`-amino acid ?A. LysineB. PhenylalanineC. ValineD. Glycine

Answer» Correct Answer - D
Glycine is synthesised by the body.
3281.

The halides which will not gives ppt. with `AgNO_(3)` :A. B. C. D.

Answer» Correct Answer - a
Partial double bond character in A make it unreactive.
3282.

Which is the following will give positive iodoformA. `Me-underset(O)underset(||)C-underset(O)underset(||)C-Me`B. C. `Me-overset(O)overset(||)C-OH`D. `Me-underset(OH)underset(|)overset(Me)overset(|)C-CH_(2)-Me`

Answer» Correct Answer - b
3283.

Which of the following compounds will gives iodoform with `NaOH+I_(2)` ?A. B. `Ph-overset(O)overset(||)C-CH_(2)-overset(O)overset(||)C-Ph`C. `CH_(3)underset(Ots)underset(|)CHH-CH_(3)`D. `Me-underset(O)underset(||)C-OH`

Answer» Correct Answer - a,b,c
3284.

Which of the following pairs gives positive iodoform test ?A. Glucose, sucroseB. Glucose, fructoseC. Hexanal, acetophenoneD. Fructose, sucrose

Answer» Correct Answer - B
Both glucose and fructose give positive iodoform test.
3285.

A compound that gives a positive iodoform test is :A. 1-pentanolB. 2-pentanolC. 3-pentanolD. 4-pentanol

Answer» Correct Answer - b
3286.

There are four alcohols P,Q,R,S which have 3,2,1,zero alpha hydrogen atoms which will not gives any colour in Victor Meyer test:A. PB. QC. RD. S

Answer» Correct Answer - d
3287.

Number of compounds having molecular formula `C_(5)H_(12)O` giving blue coloured complex in Victor Meyer test will be .

Answer» Correct Answer - 5
3288.

Alcohols which can give white turbidity immediately on reaction with Lucas reagent are :A. B. `Ph_(3)C-OH`C. `H_(3)C-OH`D. `H_(3)C-underset(H)underset(|)overset(CH_(3))overset(|)C-OH`

Answer» Correct Answer - a,b
3289.

Consider the following sequence of reaction, `overset(1. BrCH_(2)(COOEt)_(2))underset(2.C_(2)H_(5)O^(Theta)Na^(o+))rarr A overset(1. Ph-CH_(2)-Br)underset(2. HCl, H_(2)O, Delta)rarr B` The major final product (B) is :A. `H_(2)N-CH_(2)COOH`B. `Ph-underset(NH_(2))underset(|)(CH)-COOH`C. `Ph-CH_(2)-overset(NH_(2))overset(|)(CH)-COOH`D. `PhCH_(2)-underset(NH_(2))underset(|) overset(COOEt) overset(|)C-COOH`

Answer» Correct Answer - C
3290.

Deficiency of which vitamin causes degeneration of spinal cord?A. EB. KC. `B_12`D. A

Answer» Correct Answer - C
Degeneration of spinal cord is also known as lichtheims disease. It arises due to deficiency of vitamin- `B_12` (i.e. cyanocobalamine , `C_63H_88N_14PCo`) . It is usually associated with pernicious anaemia. Sources of vitamin -`B_12` are liver of ox, sheep , pig , fish ,etc.
3291.

Enumerate the properties of enzymes and ” its classification.

Answer»

Properties of Enzymes:

  • Enzymes are needed in a minute quantity for the acceleration of biochemical reactions.
  • Enzymes exhibit specificity in their reactions. Each enzyme can act on a particular substance only.
  • Enzymes act within a narrow range of pH and temperature. So they are referred to as thermolabile compounds.
  • Enzymes can act either way in a biochemical reaction because biochemical reactions are reversible.
  • Enzymes can be destroyed or inactivated by a number of substances like cyanide, iodo acetic acid, malonic acid, etc. The substances capable of hampering enzymatic reactions are called enzyme inhibitors.
  • Enzymes work in teams, making cell metabolism a continuous process.
  • Classification of enzymes. ‘Enzymes are classified into six major groups based on type of functions.

They are :-

  • Oxide-Reductases
  • Transferases
  • Hydrolases
  • Lyases
  • Isomerases
  • Ligases

(1) Oxide-Reductases:

These are enzymes catalysing oxidation and reduction reactions. These oxidation and reduction reactions are generally referred to as redox reactions.

(2) Transferases: 

These enzyme accelerate reactions involving transfer of functional groups from one compound to another compound.

(3) Hydrolases: 

These are enzymes capable of accelerating hydrolytic reactions. Breaking down of large molecules with the addition of water is called hydrolysis. Enzymes involved in hydrolytic reaction are referred to as hydrolases.

(4) Lyases:

These enzymes catalyse reactions involving breaking of large molecules without addition of water.

(5) Isomerases:

These enzymes catalyse reactions involving rearrangement of molecule structure of substrate to form an isomer. Hence they catalyse isomerisation reactions they are termed as isomerases.

(6) Ligases:

These enzymes accelerate synthetic reactions like polymerisation. 

3292.

If the sequence of bases in one strand of `DNA` is `ATGACTGTC` then the sequence of bases in its complementary strands is:A. `TACTGACAG`B. `TUCTGUC CUG`C. `GUAGTUAUG`D. None of the above

Answer» Correct Answer - A
3293.

Difference between globular protein and fibrous protein. 

Answer»
 Globular Protein Fibrous Protein 
1. they form α‐helix structure. 1. they have β‐pleated structure.
2. they are water soluble. 2. they are water insoluble. 
3. they involve H bonding. 3. they have strong intermolecular forces of attraction.

3294.

Name one fibrous and one globular protein.

Answer» Collagen, histone.
3295.

The example of globular protein is(a) Collagen(b) Insulin(c) Myosin(d) Keratin

Answer»

The answer is (b) Insulin

3296.

Turn over number of an enzyme meansA. number of substrate molecules acted upon by one molecule of an enzyme per minuter.B. number of enzyme molecules acting on one molecule of substrate per mintue.C. number of molecules of end product produced by an enzyme in one minute.D. number of subsrate molecules acted upon by an enzyme per second.

Answer» Correct Answer - A
3297.

Listed below are certain proteins. Which of them are the only structural proteins ? (i) Collagen (ii) Trypsion (iii) Keratin (iv) Actin (v) Albumin (vi) TubulinA. (i),(iii),(iv)B. (ii),(iv),(v), (vi)C. (i),(iii),(vi)D. (i),(iii), (iv),(v),(vi)

Answer» Correct Answer - C
3298.

The Michaelis constant `K_(m)` isA. Numerically equal to `1/2V_(max)`B. Dependent on the enzyme concentrationC. Numerically equal to the substrate concentration that gives half maximal velocityD. Increased in the presence of non-competitive inhibitor

Answer» Correct Answer - C
3299.

Michaelis constant `K_(m)` is equla toA. `(K_(1))/(K_(2)-K_(3))`B. `(K_(1)+K_(2))/(K_(1))`C. `(K_(2)-K_(3))/(K_(1))`D. `(K_(1)-K_(2))/(K_(3))`

Answer» Correct Answer - B
3300.

The value of `K_(m)` (Michaelis-Meten constant) varies form `10^(6)` to `10^(-6)` M but for allosteric enzyme, there is no constant `k_(m)` value. This `K_(m)` is .A. substrate concentration at which the enzymatic reaction attains half its maximum vleocity `((1)/(2)V_("max"))`B. enzyme concentration at which the reaction attaines `(1)/(2)V_("max")`.C. end prouduct concentration at which reaction attains `(1)/(2)V_("max")`.D. none of the above statements is correct.

Answer» Correct Answer - A