94420 + Interview Questions in Chemistry in Class 12

1.	Proteins do not respond to:
Answer» BIURET test Lucas test Ninhydrin test Xanthoproteic test Answer :B

Discussion

2.	Proteins can be classified into two types on the basis of their molecular shapes i.e., fibrous proteins and globular proteins. Examples of globular proteins are ……………..
Answer» Insulin Keratin ALBUMIN Myosin Solution :(A) and (C) GLOBULAR PROTEINS, the polypeptide chain coils to give a spherical shape.

Discussion

3.	Proteins contain
Answer» C,H,O onlyN C, H C, H, 0 and N Answer :D

Discussion

4.	Proteins can be classified into two types on the basis of their molecular shape. i.e., fibrous proteins and globular proteins. Esamples of globular proteins are :
Answer» INSULIN KERATIN ALBUMIN MYOSIN Solution :Insulin and albumin are globular proteins while keratin and myosin are fibrous protein.

Discussion

5.	Proteins cannot be denatured by the addition of
Answer» WATER ACIDS DETERGENTS HEAT ANSWER :A

Discussion

6.	Proteins are used as
Answer» enzymes antivirus vaccines food all of these Answer :D

Discussion

7.	Proteins are polymers of a-amino acids which are connected to each other by
Answer» IONIC BOND. covalent bond peptide bond. coordinate bond. ANSWER :C

Discussion

8.	Proteins are polymers of…………
Answer» SOLUTION :`ALPHA` - AMINO ACIDS

Discussion

9.	Proteins are polymer of amino acids . Which of the following is not a protein
Answer» Wool Nails Hair DNA Answer :D

Discussion

10.	Proteins are important polymers of biological system. What is denaturation of proteins ?
Answer» SOLUTION :The PHENOMENON in which proteins undergo changes in physical and biological properties without AFFECTING its chemical composition under the EFFECT of heat or chemical reagents is CALLED denaturation.

Discussion

11.	Proteins are important polymers of biological system. Give two example of denaturation.
Answer» SOLUTION :Coagulation of EGG white on boiling, curdling of MILK.

Discussion

12.	Proteins are hydrolysed byenzymes into ……….. .
Answer» dicarboxylicaicd HYDROXY ACIDS amino acids AROMATIC acids ANSWER :C

Discussion

13.	Proteins are hydrolysed by enzymes into
Answer» HYDROXY acids `ALPHA`-amino acids dicarboxylic acid none of these Answer :B

Discussion

14.	Proteins are found to have two different types of secondary structures viz. alpha -helix and beta -pleated sheet structurealpha-helix structure of protein is stabilised by …………………
Answer» PEPTIDE bonds van dar WAAL's FORCES HYDROGEN bonds dipole-dipole interactions SOLUTION :

Discussion

15.	Proteins are generally ……… .
Answer» POLY AMIDES polyesters POLYMER poly PEPTIDE ANSWER :D

Discussion

16.	Proteins are formed to have two different types of secondary structures viz, alpha-helix and beta-pleated sheet structure. alpha-helix structure of protein is stabilized by :
Answer» PEPTIDE bonds van DER WAALS, forces Hydrogen bonds Dipole-dipole interactions Answer :C

Discussion

17.	Proteins are found to have two different types of secondary structures viz alpha-helix and beta-pleated sheet structure. alpha-helix structure of protein is stabilised by
Answer» peptide bonds van der WAALS forces hydrogen bonds dipole-dipole interactions Solution :`alpha`-Helix structure of PROTEIN is stabilised by hydrogen bonds between -NH- group of one amino ACID RESIDUE and the group of ANOTHER amino acid residue.

Discussion

18.	proteins are found to have two different type of secondary sturctures, alpha-helix and betapleated sheet structure alpha-helix structure of protein is stabilised by ______.
Answer» Peptide bond VANDER Waals forces HYDROGEN BONDS dipole - dipole interaction Solution :hydrogen bonds

Discussion

19.	Proteins are biomolecules composed of alpha- amino acids. An alpha-amino acid has a general formula R-underset(underset(NH_(2))(\|))(C)-COOH. The amino acids polymerise and form an amide linkage (peptide linkage) between two monomeric amino acid units. The polymerisation takes place as follows H_(2)N-overset(overset(R_(1))(\|))(CH)-underset(underset(O)(\|\|))(C)-OH+H- underset(darr underset((-2H_(2)O))("Polymerisation"))(HN-overset(overset(R_(2))(\|))(CH)-underset(underset(O)(\|\|))(C))-OH+H-NH- overset(overset(R_(3))(\|))(CH)-underset(underset(O)(\|\|))(C)-OH Two or more similar amino acids can also polymerise, for example a dimer will be like. H_(2)N- overset(overset(R)(\|\|))(CH)-underset(underset(O)(\|\|))(C)-NH-overset(overset(R)(\|\|))(CH)-underset(underset(O)(\|\|))(C)-OH. In the given trimer if R_(1) =H , R_(2) =CH_(3) and R_(3) = Ph then the amino acids present in the trimers are :
Answer» Glycine,ALANINE & PHENYL Alanine Glycine,LEUCINE & Phenyl Alanine Alanine,VALINE & Phenyl Alanine Alanine,Leucine & Lysine Answer :A

Discussion

20.	Proteins are built up of
Answer» Dicarboxylic ACIDS Amino acids Alcohols Hydroxy acids Solution :Proteins are POLYMERS of amino acids Amino acid `to` Dipeptide `to ` POLYPEPTIDE `to ` PROTEIN

Discussion

21.	Proteins are biomolecules composed of alpha- amino acids. An alpha-amino acid has a general formula R-underset(underset(NH_(2))(\|))(C)-COOH. The amino acids polymerise and form an amide linkage (peptide linkage) between two monomeric amino acid units. The polymerisation takes place as follows H_(2)N-overset(overset(R_(1))(\|))(CH)-underset(underset(O)(\|\|))(C)-OH+H- underset(darr underset((-2H_(2)O))("Polymerisation"))(HN-overset(overset(R_(2))(\|))(CH)-underset(underset(O)(\|\|))(C))-OH+H-NH- overset(overset(R_(3))(\|))(CH)-underset(underset(O)(\|\|))(C)-OH Two or more similar amino acids can also polymerise, for example a dimer will be like. H_(2)N- overset(overset(R)(\|\|))(CH)-underset(underset(O)(\|\|))(C)-NH-overset(overset(R)(\|\|))(CH)-underset(underset(O)(\|\|))(C)-OH. In the above trimer, if R_(1)=H , R_(2)=CH_(3) & R_(3)=Ph then total number of optically active stereoisomers will be :
Answer» 8 6 4 2 Solution :The trimer will have structure `H_(2)N-CH_(2)-underset(underset(O)(\|\|))(C)-NH-OVERSET(overset(CH_(3))(._()\|))(CH)-underset(underset(O)(\|\|))(C)-NH-overset(overset(PH)(._(\|)))(CH)-underset(underset(O)(\|\|))(C)-OH`. It has two dissimilar asymmetric atoms, so its total NUMBER of stereoisomers will be `2^(2) =4`.

Discussion

22.	Proteins are composed of:
Answer» Nucleotides Nucleosides Dipeptides Amino acids Answer :C

Discussion

23.	Proteins are
Answer» POLYPEPTIDES polyacids POLYPHENOLS POLYESTERS SOLUTION :polyphenols

Discussion

24.	Protein with special three dimensional structureand biological activity is called :
Answer» NATIVE PROTEIN Conjugative protein SIMPLE protein GLOBULAR protein ANSWER :A

Discussion

25.	Protein with special three dimensional structure and biological activity is called :
Answer» NATIVE PROTEIN Conjugative protein Simple protein GLOBULAR protein Answer :A

Discussion

26.	Protein which acts as hormone is
Answer» Casein Oxytocin Trypsin Keratin Answer :B

Discussion

27.	Protein synthesis in living cells is also called
Answer» Transcription Translation Replication Duplication Answer :B

Discussion

28.	Protein specificity is due to
Answer» TYPES of AMINO ACIDS Sequence of amino acids Time of SYNTHESIS Quantity , Solution :Protein SPECIFICITY is due to sequence of amino acids.

Discussion

29.	Protein overset(P)rarr Polypeptide overset(Q)rarr Amino acid. P and Q are-
Answer» INVERTASE and zymase amylase and maltase diastase and lipase pepsin and trypsin Answer :B

Discussion

30.	Protein on hydrolysis gives .. .... alpha-ammino acids ?
Answer» 15 20 30 40 Answer :C

Discussion

31.	Protein on hydrolysis gives
Answer» `BETA`-aminoacids `ALPHA`-aminoacids `GAMMA`-aminoacids `delta`-aminoacids Answer :B

Discussion

32.	Protein is described as a …………...........
Answer» POLYAMIDE POLYESTER POLYPEPTIDE Polyurethane Solution :Polyamide

Discussion

33.	Protein is an important constituent of our diet. It functions mainly as:
Answer» A SOURCE of ENERGY CONSTRUCTION material Shock absorber Reserve food Answer :D

Discussion

34.	Protein is a polymer of
Answer» amino acid. `ALPHA`-amino acids. `BETA`-amino acids. `gamma-`amino acids. Answer :B

Discussion

35.	Protein is a polymer made of
Answer» carbohydrates AMINO ACIDS nucleic acids carboxylic acids Solution :PROTEINS are CONDENSATION polymers of `alpha-` amino acids.

Discussion

36.	Protein is a polymer of:
Answer» GLUCOSE Terephthalic acid Amino acids None of these Answer :C

Discussion

37.	Protein found in a biological system with a unique three-dimensional structure and biological activity is called a native protein. When a protein in its native form, is subjected to a physical change like change in temperature or a chemical change like, change in pH, denaturation of proteins takes. Explain the cause.
Answer» Solution :Due to PHYSICAL or chemical change, hydrogen bonds in proteins are disturbed, GLOBULES unfold and HELIX gets uncoiled therefore, protein LOSES its biological activity. This is CALLED denaturation of proteins.

Discussion

38.	Protein gives blue colour with
Answer» BENEDICT REAGENT iodine SOLUTION Ninhydrin Biuret reagent Solution :When protein is boiled with a dilute solution of ninhydrin (triketo hydrindin), a blue COLOUR is PRODUCED Protein + Ninhydrin solution `oversetDelta to` Blue colour.

Discussion

39.	Protein is a polymer of :
Answer» GLUCOSE Terephthalic ACID AMINO acid Glycol. Answer :C

Discussion

40.	Protein found in a biological system with a unique three - dimensional structure and biological activity is called a native protein. When a protein in its native form , is subjecteed to a physical change like change in temperature or a chemical change like , change in p H , denaturation of protein takes place. Explain the cause.
Answer» Solution :Due to a physical or a chemical change , H-bonds in proteins are broken , globules unfold and helices GET uncoiled to form a THREAD LIKE molecuole. As a result , secondary and tertiary STRUCTURES are destroyed and the protein loses its biological activity. This process is called DENATURATION of proteins.

Discussion

41.	Protein can be most easily removed from
Answer» ALKANES Alkenes Alkynes Benzene SOLUTION :PROTEIN is INSOLUBLE in benzene.

Discussion

42.	Protein fibers are
Answer» polyamide FIBRES vegatable fibres REGENERATED fibers SYNTHETIC fibres Answer :A

Discussion

43.	Protein are found to have two different types of secondary structures viz. alpha-helix and beta -pleated sheet structure , alpha-Helix structure of protein is established by :
Answer» Peptide bonds VAN der Waals FORCES Hydrogen bonds DIPOLE -dipole INTERACTIONS Answer :C

Discussion

44.	Protective sols are :
Answer» LYOPHILIC lyophobic both (A) and (B) NONE of (A) and (B) ANSWER :A

Discussion

45.	Protein can be most easily removed by:
Answer» Alkanes Alkenes Alkynes Benzene Answer :C

Discussion

46.	Protactinium-234 (""_(91)^(234)Pa) decays to ""_(92)^(234)U with the emission of :
Answer» `ALPHA`-PARTICLE `beta`- particle `LAMBDA`-ray positron. Answer :B

Discussion

47.	Prostaglandin E_(1)1 is a compound produced by the body to regular a variety of processes including blood clottind, fevar, pain and inflammation. A.Which of the following functional groups is not contained in 1 ? (a) A ketone(b) An alcohol(c ) A carboxylic acid (d) An alkene (e ) A nitrile B. How many asymmetric (stereogenic) centres are present in compound 1 ? (a) 3(b) 4(c ) 5(d) 6 C. How many sp^(2) hybridised atoms are persent in compound 1 ? (a) 1(b) 2 (c ) 3 (d) 4 D. What is the geometric configuration about the double bond in compound 1 ? (a) e(b) Z
Answer» SOLUTION :N//A

Discussion

48.	Protection of iron by coating with zinc is called______.
Answer» SOLUTION :GALVANISATION

Discussion

49.	Prosthetic group of glyco-protein is………………….
Answer» LIPID CARBOHYDRATE Nucleic acid Vitamin Solution :Carbohydrate

Discussion

50.	Prostaglandins is
Answer» a GROUP of `C_(20)` lipids a group of `C_(10)` lipids a group of `C_(50)` lipids a group of `C_(100)` lipids Answer :A

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Proteins do not respond to:

Proteins can be classified into two types on the basis of their molecular shapes i.e., fibrous proteins and globular proteins. Examples of globular proteins are ……………..

Proteins contain

Proteins can be classified into two types on the basis of their molecular shape. i.e., fibrous proteins and globular proteins. Esamples of globular proteins are :

Proteins cannot be denatured by the addition of

Proteins are used as

Proteins are polymers of a-amino acids which are connected to each other by

Proteins are polymers of…………

Proteins are polymer of amino acids . Which of the following is not a protein

Proteins are important polymers of biological system. What is denaturation of proteins ?

Proteins are important polymers of biological system. Give two example of denaturation.

Proteins are hydrolysed byenzymes into ……….. .

Proteins are hydrolysed by enzymes into

Proteins are found to have two different types of secondary structures viz. alpha -helix and beta -pleated sheet structurealpha-helix structure of protein is stabilised by …………………

Proteins are generally ……… .

Proteins are formed to have two different types of secondary structures viz, alpha-helix and beta-pleated sheet structure. alpha-helix structure of protein is stabilized by :

Proteins are found to have two different types of secondary structures viz alpha-helix and beta-pleated sheet structure. alpha-helix structure of protein is stabilised by

proteins are found to have two different type of secondary sturctures, alpha-helix and betapleated sheet structure alpha-helix structure of protein is stabilised by ______.

Proteins are built up of

Proteins are composed of:

Proteins are

Protein with special three dimensional structureand biological activity is called :

Protein with special three dimensional structure and biological activity is called :

Protein which acts as hormone is

Protein synthesis in living cells is also called

Protein specificity is due to

Protein overset(P)rarr Polypeptide overset(Q)rarr Amino acid. P and Q are-

Protein on hydrolysis gives .. .... alpha-ammino acids ?

Protein on hydrolysis gives

Protein is described as a …………...........

Protein is an important constituent of our diet. It functions mainly as:

Protein is a polymer of

Protein is a polymer made of

Protein is a polymer of:

Protein gives blue colour with

Protein is a polymer of :

Protein can be most easily removed from

Protein fibers are

Protein are found to have two different types of secondary structures viz. alpha-helix and beta -pleated sheet structure , alpha-Helix structure of protein is established by :

Protective sols are :

Protein can be most easily removed by:

Protactinium-234 (""_(91)^(234)Pa) decays to ""_(92)^(234)U with the emission of :

Protection of iron by coating with zinc is called______.

Prosthetic group of glyco-protein is………………….

Prostaglandins is