3593 + Interview Questions in BIOMOLECULES IN GENERAL AWARENESS Page 2 InterviewSolution

51.

Differentiate between the following: (i) Apoenzyme and Coenzyme, (ii) Competitive inhibition and Allosteric inhibition, (iii) Oligosaccharides and Polysaccharides, (iv) Coenzyme and Prosthetic group, (v) Anabolism and Catabolism.

Answer»

(i) Apoenzyme and Coenzyme,

S. No.	Apoenzyme	Coenzyme
(i)	Apoenzyme is the protein part of enzyme composed of only amino acids.	Coenzyme is the non- protein organic part of the enzyme which is attached to the apoenzyme to form the conjugated protein
(ii)	Larger in size	It is smaller in size.
(iii)	Specific for an enzyme.	It can function as a cofactor for a number of enzymes carrying out specific type of function.
(iv)	Apoenzyme is responsible for catalytic activity of the enzyme.	Coenzyme takes part in the removal of the product of reaction.

(ii) Competitive inhibition and Allosteric inhibition,

S.No	Competitive inhibition	Allosteric inhibition
(i)	No regulatory function.	Regulation of the metabolic activity by stopping the excess formation of the product.
(ii)	Binds with active site.	Binds with some other site except active site.
(iii)	Inhibitor shows very close resemblance to the substrate in structural organisation.	Inhibitor shows no resemblance to the substrate.
(iv)	Inhibitor is not a product of metabolic pathway	Inhibitor is a product or intermediate of metabolic pathway.

(iii) Oligosaccharides and Polysaccharides,

S.No.	Oligosaccharides	Polysaccharides
(i)	Soluble in water.	Not soluble in water
(ii)	Consist of 2-9 monosaccharide units.	Consist of many monosaccharide units.
(iii)	Sweet in taste	Tasteless.
(iv)	Micromolecules of the cell.	Macromolecules of the cell.
(v)	Example : Sucrose, maltose and lactose.	Example : Glycogen, starch and cellulose.

(iv) Coenzyme and Prosthetic group,

Coenzyme	Prosthetic group
It is a non-protein group which is loosely attached to the open end in a functional enzyme.	It is a non-protein part or group which gets attached to open enzyme.
NAD is coenzyme for dehydrogenases of the cytochromes.	Some prosthetic groups have metals e.g., iron porphyrin.

(v) Anabolism and Catabolism.

S.No.	Anabolism	Catabolism
(i)	It is the constructive phase of the metabolism.	It is the destructive phase of the metabolism.
(ii)	Diverge reaction.	Converge reactions
(iii)	It stores energy	It releases energy.
(iv)	e.g., Nutrition, growth etc.	e.g., Respiration.

Discussion

52.	KuhneA. Discovered enzymesB. Coined the term enzymeC. Coined the term geneD. Discovered parathyroid hormone
Answer» Correct Answer - B (B) Kuhne coined the term enzyme.

Discussion

53.	A : The polypeptide coil of collagen helix is strengthened by the estabilishment of hydrogen bond between `gtNH`-group of glycine residue of each strand with -CO group of other two strand. R : In collagen helix locking effect also occurs with the help of proline and hydroxyproline amino acid.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

Discussion

54.	Apoenzyme and coenzyme collectively produceA. holoenzymeB. enzyme-product complexC. cofactorD. prosthetic group
Answer» Correct Answer - A

Discussion

55.	Which one of the following statements regarding enzyme inhibition is correctA. Non-competitive inhinition of an enzyme can be overcome by adding large amount of substrateB. Competitive inhibition is seen when a substrate competes with an enzyme for binding to an inhibitor proteinC. Competitive inhibition is seen when the substrate and the inhibitor competeD. Non-competitive inhibitors often bind to the enzyme irrevesibly
Answer» Correct Answer - C

Discussion

56.	Which one of the following statements regarding enzyme inhibition is correctA. Competitive inhibition is seen when a substrate competes with an enzyme for binding to an inhibitor proteinB. Competitive inhibition is seen when the substrate and the inhibtor compete for the active site on the enzymeC. Non-competitive inhibition of an enzyme can be overcome by adding large amount of substrateD. Non-competitive inhibitors often bind to the enzyme irreversibly
Answer» Correct Answer - B

Discussion

57.	Which one of the following statements regarding enzyme inhibition is correctA. Competitive inhibition is seen when a substrate competes with an enzyme for binding to an inhbitor proteinB. Competitive inhibition is seen when the substrate and the inhibitor compete for the active site on the enzymeC. Non-competitive inhibition of an enzyme can be overcome by adding large amount of substrateD. Non-competitive inhibitors often bind to the enzyme irreversrbly
Answer» Correct Answer - B A competitive inhibitor competes with substrate molecule for occupying the active site of an enzyme. These inhibitors have structural resemblance with substrate molecules due to which they easily bind with active site of an enzyme and from an enzyme-inhibitor complex `underset("(enzyme)")(E)+underset("(inhibitor)")(I) rarr"EI complex"`

Discussion

58.	Which one of the following statements regarding enzyme inhibition is correctA. Competitive inhibition occurs when a substrate competes with enzymes for binding to inhibitor protein .B. Competitive inhibition occurs when the substrate and the inhibitor compete for active site on the enzyme.C. Non-competitive inhibition of an enzyme can be overcome by adding large amount of substrate.D. Non-competitive inhibitors often bind to the enzyme irreversibly.
Answer» Correct Answer - B (B) Competitive inhibition occurs when the subsrate and inhibitor compete for active site on the enzyme. Non - competitive inhibition of an enzyme cannot be overcome by adding large amount of substrate. Non-competitive inhibitors often bind to the enzyme reversibly.

Discussion

59.	In which one of the following enzymes, is copper necessarily associated as an activatorA. Lactic dehydrogenaseB. TyrosinaseC. Carbonic anhydraseD. Tryptophanase
Answer» Correct Answer - B

Discussion

60.	A : Non-competitive inhibitors have no effect on `V_(max)`. R : In non-competitive inhibition, inhibitor and substrate bind at same sites on the enzyme.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 - D

Discussion

61.	Which one of the following statements regarding enzyme inhibition is correctA. Competitive inhibition is seen when a substrate competes with an enzyme for binding to an inhibitor proteinB. Competitive inhibition is seen when the substrate and the inhibitor compete for the active site on the enzymeC. Non-competitive inhibition of an enzyme can be overcome by adding large amount of substrateD. Non-competitive inhibitors often bind to the enzyme irreversibly
Answer» Correct Answer - B

Discussion

62.	Which one of the following statements is incorrect about enzyme catalysis?A. Enzymes are mostly proteinous in nature.B. Enzyme action is specific.C. Enzymes are denatured by ultraviolet rays and at high temperature.D. Enzymes are least reactive at optimum temperature.
Answer» Correct Answer - D Enzymes are maximum reactive at optimum temperature.

Discussion

63.	Non-proteinaceous enzyme that acts as a catalyst for the formation of peptide bond is Or 'All enzymes are proteins.' This statement is now modified because an apparent exception to this biological truth isA. SpliceosomeB. RibozymeC. RNA poly ID. RNA poly III
Answer» Correct Answer - B

Discussion

64.	Which of the statements about 'Denaturation' given below are correct ? (1) Denaturation of proteins causes loss of secondary and tertiary structures of the protein. (2) Denaturation leads to the conversion of double strand of DNA into single strand. (3) Denaturation affects primary structure which gets distorted.A. (2) and (3)B. (1) and (3)C. (1) and (2)D. (1), (2) and (3)
Answer» Correct Answer - C Denaturation does not change the primary structure of proteins.

Discussion

65.	An optically pure compound `A,` gave an `[alpha]_(D)^(25)=+30^(@),` while a mixture of `A` and its enantiomer `B`, gave `[alpha]_(D)^(25)=+15^(@),` . The ratio of `A` to `B` in the mixture isA. 1 to 3B. 3 to 1C. 1 to 2D. 2 to 1
Answer» Correct Answer - B `(15)/(30)xx100=50` Thus the mixture is 50% opticaaly pure. Hence the amount of `A=50+25=75 B=0+25=25`

Discussion

66.	Assertion `:` Protein are made up of `alpha-` amino acids. Reason`:` During denaturation, secondary and tertiary structures of proteins are destroyed.A. Both assertion and reason correct and the reason is correct expansion to assertion.B. Both assertion and reason are correct but reason is not the correct expansion of assertion.C. Assertion is correct but reason is wrongD. Assertion is incorrect but reason is correct.
Answer» Correct Answer - C Correct Explanation: During formation of proteins, `NH_(2)` group of one amino acid acid condensess with `CO_(2)H` of of the other with elemination of a water molecule to form a peptide bond.

Discussion

67.	Which was the first alkaloid discovered? Mentions its uses.
Answer» Morphine is the first alkaloid to be found. It comes from the plant Opium poppy (Papaver somniferum). It is used as a pain reliever in patients with severe pain levels and cough suppressant.

Discussion

68.	A compound which contains both ……….. And …………..is called amino acid. The amino acids in polypeptide chain are joined by …………bonds.A. amino, carboxylic , group , esterB. amino, carboxylic group, peptide.C. nitrogen , carbon , glycosidicD. hydroxy, carboxylic group, peptide.
Answer» Correct Answer - B

Discussion

69.	Write a note on peptide bonds between amino acids.
Answer» The amino group of one amino acid reacts with carboxyl group of other amino acid, forming a peptide bond. Two amino acids can react together with the loss of water to form a dipeptide. Long strings of amino acids linked by peptide bonds are called polypeptides. In 1953, Fred Sanger first sequenced the Insulin protein.

Discussion

70.	Contractile protein isA. actinB. myosinC. tropninD. tropomyosin
Answer» Correct Answer - A

Discussion

71.	which of the following is a contractile protein ?A. P-proteinB. MyosinC. AlbuminD. Penneases
Answer» Correct Answer - B

Discussion

72.	What is Rubisco ?
Answer» Rubisco is an enzyme involved in carbon fixation, a process by which atmospheric `CO_(2)` is converted by plants to energy rich molecules i.e. glucose.

Discussion

73.	Which one is the most abundant protein in the animal worldA. TrypsinB. HaemoglobinC. CollagenD. Insulin
Answer» Correct Answer - C (C) The most abundant protein in the animal world is collagen.

Discussion

74.	Write a note on RUBISCO.
Answer» Ribulose biphosphate carboxylase oxygenase (RUBISCO) is an enzyme that catalyses the reaction between CO₂ and the CO₂ acceptor molecule in photosynthesis. It is the most abundant protein in the whole biosphere.

Discussion

75.	Which one is the most abundant protein in the animal worldA. haemoglobinB. CollagenC. InsulinD. Trypsin
Answer» Correct Answer - B

Discussion

76.	What is autocatalysis ?
Answer» Activation of a proenzyme by its own activated molecules.

Discussion

77.	Which form of RNA has a structure resembling clover leaf?A. rRNAB. hnRNAC. mRNAD. tRNA
Answer» Correct Answer - D The basic plan of the structure of tRNA assumes the pattern of a clover leaf. The structures cf different tRNAs for almost all amino acids are now available and all of these fit the clover leaf model. The tRNA structure can be decomposed into its prirmary structure and its secondary structure (usually seen as clover leaf structure) and tertiary structure.

Discussion

78.	Which of the following RNAs have clover leaf structure?A. transfer RNAB. messenger RNAC. ribosomal RNAD. heterogenous RNA
Answer» Correct Answer - A

Discussion

79.	The type of RNA responsible for proper se- quence of amino acids in protein synthesis isA. rRNAB. tRNAC. mRNAD. hnRNA
Answer» Correct Answer - C

Discussion

80.	Macromolecules areA. nucleic acids, proteins and polysac- charidesB. nucleic acids and monosaccharidesC. amino acids and polysaccharidesD. amino acids, lipids and nucleotides
Answer» Correct Answer - A

Discussion

81.	________ are water insoluble and small molecular weight compounds as compared to macromolecules.(A) Lipids (B) proteins (C) carbohydrates (D) nucleic acids.
Answer» The correct answer is (A) Lipids

Discussion

82.	The nitrogenous organic base purine occurring in RNA isA. cytosineB. thymineC. guanineD. uracil
Answer» Correct Answer - C Purines are 9-membered double ring nitrogen bases which possess nitrogen at 1, 3, 7 and 9 positions, e.g. adenine (A), guanme (G). These purines are present in both DNA and RNA.

Discussion

83.	Most diverse macromolecules, found in the cell both physically and chemically areA. proteinsB. carbohydratesC. nucleic acidsD. lipids
Answer» Correct Answer - A Proteins are the most diverse among organic compounds. Among the biomolecules, proteins constitute 9-12%, fat 1-3%, carbohydrates 1-2%, minerals 1-3%, nucleic acids 2% and water 60-75%.

Discussion

84.	The most diverse chemical isA. phosphopildB. CelluloseC. proteinsD. carbohydrates
Answer» Correct Answer - C

Discussion

85.	Assertion. Glucose is the main fuel in all cells. Reason. The cells draw glucose from the blood.A. If both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.B. If both Assertion and Reason are true but Reason is not a correct explanation of the Assertion.C. If Assertion is true but the Reason is false.D. If both Assertion and Reason are false.
Answer» Correct Answer - B

Discussion

86.	Assertion. A variety of organisms are adapted for land life. Reason. Terrestrial organisms are independent of water.A. If both Assertion and Reason are true and the Reason is a correct explanation of the Assertion.B. If both Assertion and Reason are true but Reason is not a correct explanation of the Assertion.C. If Assertion is true but the Reason is false.D. If both Assertion and Reason are false.
Answer» Correct Answer - C

Discussion

87.	Which one of the following is not given by Erwin Chargaff ?A. Base composition of DNA varies from one species to anotherB. The base composition of DNA does not change with age, nutrition or changes in the environmentC. Molar amounts of adenine are equal to the molar amounts of thymineD. DNA can transcribe RNA
Answer» Correct Answer - D

Discussion

88.	Chargaff analyzed the composition of DNA from various sources. Mention what were his implications from all his experiments.
Answer» Implications proposed by Erwin Chargaff: 1. Purine and pyrimidine always occur in equal amount in DNA. 2. The base ratio i.e. A+T/G+C may vary in the DNA of different groups of animals and plants but the ratio remains constant for particular species.

88.

Chargaff analyzed the composition of DNA from various sources. Mention what were his implications from all his experiments.

Answer»

Implications proposed by Erwin Chargaff:

1. Purine and pyrimidine always occur in equal amount in DNA.

2. The base ratio i.e. A+T/G+C may vary in the DNA of different groups of animals and plants but the ratio remains constant for particular species.

Discussion

89.	2,4-Dichlorphenoxyacetic acid is used asA. FungicideB. InseticideC. HerbicideD. Moth repellent
Answer» Correct Answer - C 2,4-Dichlorophenoxycetic acid is a herbicide.

Discussion

90.	The beewax isA. promethazineB. mifepristoneC. bithionalD. myricyl palmitate
Answer» Correct Answer - D See waxes.

Discussion

91.	Hydrolysis of sucrose with dilute aqueous sulphuric acid yieldsA. 1:1 (D) (+)-Glucose,D-(-)-fructoseB. 1:2(D) (+)-Glucose,D-(-)-fructoseC. 1:1(D) (-)-Glucose,D-(+)-fructoseD. 1:2(D) (-)-Glucose,D-(+)-fructose
Answer» Correct Answer - A

Discussion

92.	Sucrose on reacting with conc. Sulphuric acid givesA. arabinose and `SO_(2)`B. glucose and fructoseC. carbon and waterD. carbon, water and `SO_(2)`
Answer» Correct Answer - C `C_(12)H_(22)O_(11) overset(Conc. H_(2)SO_(4)) to 12 C +11H_(2)O`

Discussion

93.	Which of the following is not correct?A. chlorophyll is responsible for the synthesis of carbohydrates in plantsB. the compound formed in the addition of oxygen to haemoglobin is called oxyhaemoglobinC. acetyl salicylic acid is known as aspirinD. the metal ion present in vitamin `B_(12)` is `Mg^(2+)`
Answer» Correct Answer - D Metal present in `B_(12)` is Co.

Discussion

94.	The figure given below shows the conversion of a substrate into product by an enzyme. In which one of the four options (a-d) the components of reaction labelled as A, B, C and D are identified correctly A. `{:(,"A","B","C","D"),((a),"Potential energy","Transition state","Activation energy with enzyme","Activation energy without enzyme"):}`B. `{:(,"A","B","C","D"),((a),"Transition state","Potential energy","Activation energy without enzyme","Activation energy with enzyme"):}`C. `{:(,"A","B","C","D"),((a),"Potential energy","Transition state","Activation energy with enzyme","Activation energy without enzyme"):}`D. `{:(,"A","B","C","D"),((a),"Activation energy with enzyme","Transition state","Activation energy without enzyme","Potential energy"):}`
Answer» Correct Answer - B (b) Activation energy is required for overcoming the energy barrier which gets reduced in the presence of enzyme.

Discussion

95.	Number of `pi` electrons which are delocalized in melamine is X and number of lone pairs which are lacalized in melamine is Y. Find value of X- Y.
Answer» Correct Answer - 9 12-3=9

Discussion

96.

Enumerate the main differences between DNA and RNA.

Answer»

S. No.	Deoxyribonucleic Acid (DNA)	Ribonucleic Acid (RNA)
(i)	Found in chromosomes of the nucleus.	Found in the cytoplasm, in nucleolus and nucleoplasm and associated with chromosomes.
(ii)	They are double stranded structure; two strands coiled spirally in opposite direction.	They are single-stranded polynucleotide chains; strand in RNA is coiled on itself and may be united by hydrogen (H) bonds.
(iii)	The sugar is deoxyribose.	The sugar is ribose
(iv)	Four nitrogenous bases in it are : (i) Adenine, (ii) Guanine, (iii) Cytosine, (iv) thymine.	Four nitrogenous bases in it are : (i) Adenine, (ii) Guanine, (iii) Cytosine, (iv) Uracil. i.e., in RNA, thymine is replaced by uracil.
(v)	Purines and pyrimidines occur in equal proportion.	Not occur in equal proportion/ratio.
(vi)	DNA is the hereditary material.	It is not the hereditary material except in few viruses.
(vii)	Can replicate and makes its copy.	Cannot replicate; it is made from DNA.
(viii)	Controls structure, metabolism, differentiation and inheritance.	Helps in protein synthesis; function as a messenger and translates messages coded in DNA into protein.
(ix)	Very long molecule; with very high molecular weight.	Relatively short molecule with low molecular weight.
(x)	Genetic material in all prokaryotic and eukaryotic cells.	Genetic material only in some viruses.

Discussion

97.	(a) Name the type of linkages responsible for the formation of primary and secondary structures of proteins. (b) On electrolysis in acidic solution, `alpha`-amino acids migrate towards cathose while in alkaline medium, they migrate towards anode. Explain. (c ) What are essential and non-essential amino acids ? Give two examples of each
Answer» (a) Peptide linkages (-CO-NH-) are present in the primary structures of proteins while the secondary structures of proteins involve hydrogen bonding. (b) An `alpha`-amino acid has a dipole a structure. In acidic medium, it exixts as a positive ion. `underset("Dipolar ion")(H_(3)overset(+)(N)-overset(H)overset(\|)underset(R )underset(\|)(C )-COO^(-))+underset(("Acid"))(H^(+))rarr underset(("Positive ion"))(H_(3)overset(+)(N)-overset(H)overset(\|)underset(R )underset(\|)(C )-COOH)` In electric field, the positive ion moves towards cathode. In alkaline medium, the dipolar ion changes to anion and moves towards anode under the influence of applied electric field. `H_(3)overset(+)(N)-overset(H)overset(\|)underset(R )underset(\|)(C )-COO^(-)underset(("Base"))(OH^(-))rarr underset(("Negative ion"))(H_(2)N-overset(H)overset(\|)underset(R )underset(\|)(C )-COO^(-))+H_(2)O` (c ) Amino acids which are not synthesised by the body are called essential amino acids. For example, Leucine and Lysine. Amino acids which are synthesised by the body are known as non-essential amino acids. For erxample, Glycine and Alanine.

Discussion

98.

Explain briefly the structural levels of proteins.OR Describe primary and secondary structures of proteins.

Answer»

Proteins are macromolecules having one or more polypeptide chains of amino acids. These are highly organised linear polymers of amino acids. Proteins have four structural levels - primary, secondary, tertiary and quaternary.

(i) Primary structure : The linear sequence of amino acids in a polypeptide chain is the primary structure of protein. The first amino acid is called N-terminus and last amino acid is called C-terminus.

(ii) Secondary structure : The polypeptide chains are coiled or folded in the form of helix. The structure is maintained by a series of regularly spaced intra or inter molecular hydrogen bonds formed between the amino acids of the same or different polypeptide chains. Such a conformation is termed as secondary structure. There are 3 types of secondary structure, αhelix, β-pleated and collagen helix.

(iii) Tertiary structure : The helical polypeptide molecules further coiled to assume a complex but specific form is called tertiary structure. They are so arranged as to hide nonpolar amino acid inside and expose the polar side chains. These structure are maintained by several types of bonds such as hydrogen bonds, vander Waal interaction, ionic bonds, disulphide bonds etc., between the polypeptide chains.

(iv) Quaternary structure: Each polypeptide develops its own tertiary structure and functions as subunit of the protein. The different charged subunits pack together to give specific conformation. Large proteins such as haemoglobin have quaternary structure. It has four chains, two α-chains and two β-chains.

Discussion

99.	which amino acid is nonessential for human body ?A. GlycineB. phhenyl alannineC. ArginineD. Methionine
Answer» Correct Answer - A

Discussion

100.	State the significance of primary and secondary structures of proteins.
Answer» Correct Answer - Primary structure The sequence in which various amino acids are arranged in a protein is called primary struture The amino acid sequence of a protein determines its function and is critical of its biological activity Secondary structure Secondary structure determines the coilling of the plypeptide chain into helical structure The secondary structure arised due to regular folding of various amino acids It is of two types alpha-helix and beta-pleated sheet configuration .

Discussion

Explore topic-wise InterviewSolutions in .

Differentiate between the following: (i) Apoenzyme and Coenzyme, (ii) Competitive inhibition and Allosteric inhibition, (iii) Oligosaccharides and Polysaccharides, (iv) Coenzyme and Prosthetic group, (v) Anabolism and Catabolism.

KuhneA. Discovered enzymesB. Coined the term enzymeC. Coined the term geneD. Discovered parathyroid hormone

Apoenzyme and coenzyme collectively produceA. holoenzymeB. enzyme-product complexC. cofactorD. prosthetic group

In which one of the following enzymes, is copper necessarily associated as an activatorA. Lactic dehydrogenaseB. TyrosinaseC. Carbonic anhydraseD. Tryptophanase

Which one of the following statements is incorrect about enzyme catalysis?A. Enzymes are mostly proteinous in nature.B. Enzyme action is specific.C. Enzymes are denatured by ultraviolet rays and at high temperature.D. Enzymes are least reactive at optimum temperature.

Non-proteinaceous enzyme that acts as a catalyst for the formation of peptide bond is Or 'All enzymes are proteins.' This statement is now modified because an apparent exception to this biological truth isA. SpliceosomeB. RibozymeC. RNA poly ID. RNA poly III

An optically pure compound `A,` gave an `[alpha]_(D)^(25)=+30^(@),` while a mixture of `A` and its enantiomer `B`, gave `[alpha]_(D)^(25)=+15^(@),` . The ratio of `A` to `B` in the mixture isA. 1 to 3B. 3 to 1C. 1 to 2D. 2 to 1

Which was the first alkaloid discovered? Mentions its uses.

A compound which contains both ……….. And …………..is called amino acid. The amino acids in polypeptide chain are joined by …………bonds.A. amino, carboxylic , group , esterB. amino, carboxylic group, peptide.C. nitrogen , carbon , glycosidicD. hydroxy, carboxylic group, peptide.

Write a note on peptide bonds between amino acids.

Contractile protein isA. actinB. myosinC. tropninD. tropomyosin

which of the following is a contractile protein ?A. P-proteinB. MyosinC. AlbuminD. Penneases

What is Rubisco ?

Which one is the most abundant protein in the animal worldA. TrypsinB. HaemoglobinC. CollagenD. Insulin

Write a note on RUBISCO.

Which one is the most abundant protein in the animal worldA. haemoglobinB. CollagenC. InsulinD. Trypsin

What is autocatalysis ?

Which form of RNA has a structure resembling clover leaf?A. rRNAB. hnRNAC. mRNAD. tRNA

Which of the following RNAs have clover leaf structure?A. transfer RNAB. messenger RNAC. ribosomal RNAD. heterogenous RNA

The type of RNA responsible for proper se- quence of amino acids in protein synthesis isA. rRNAB. tRNAC. mRNAD. hnRNA

Macromolecules areA. nucleic acids, proteins and polysac- charidesB. nucleic acids and monosaccharidesC. amino acids and polysaccharidesD. amino acids, lipids and nucleotides

________ are water insoluble and small molecular weight compounds as compared to macromolecules.(A) Lipids (B) proteins (C) carbohydrates (D) nucleic acids.

The nitrogenous organic base purine occurring in RNA isA. cytosineB. thymineC. guanineD. uracil

Most diverse macromolecules, found in the cell both physically and chemically areA. proteinsB. carbohydratesC. nucleic acidsD. lipids

The most diverse chemical isA. phosphopildB. CelluloseC. proteinsD. carbohydrates

Chargaff analyzed the composition of DNA from various sources. Mention what were his implications from all his experiments.

2,4-Dichlorphenoxyacetic acid is used asA. FungicideB. InseticideC. HerbicideD. Moth repellent

The beewax isA. promethazineB. mifepristoneC. bithionalD. myricyl palmitate

Hydrolysis of sucrose with dilute aqueous sulphuric acid yieldsA. 1:1 (D) (+)-Glucose,D-(-)-fructoseB. 1:2(D) (+)-Glucose,D-(-)-fructoseC. 1:1(D) (-)-Glucose,D-(+)-fructoseD. 1:2(D) (-)-Glucose,D-(+)-fructose

Sucrose on reacting with conc. Sulphuric acid givesA. arabinose and `SO_(2)`B. glucose and fructoseC. carbon and waterD. carbon, water and `SO_(2)`

Number of `pi` electrons which are delocalized in melamine is X and number of lone pairs which are lacalized in melamine is Y. Find value of X- Y.

Enumerate the main differences between DNA and RNA.

Explain briefly the structural levels of proteins.OR Describe primary and secondary structures of proteins.

which amino acid is nonessential for human body ?A. GlycineB. phhenyl alannineC. ArginineD. Methionine

State the significance of primary and secondary structures of proteins.