CHAPTER BIOMOLECULES. Chapterwise Previous year Qs. (c) hydrolysis of ATP (d) defence mechanism Ans: (b)
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1 259 CHAPTER BIOMOLECULES 1. On hydrolysis of starch, we finally get [1991] (a) Glucose (b) Fructose (c) Both (d) and 2. The couplings between base units of DNA is through: [1992] (a) Hydrogen bonding (b) Electrostatic bonding (c) Covalent bonding (d) Vander Waals forces 3. Enzymes take part in a reaction and [1993] (a) decrease the rate of a chemical reaction (b) increase the rate of a chemical reaction (c) both (d) and 4. Chemically considering digestion is basically (a) Anabolism [1994] (b) Hydrogenation (c) Hydrolysis (d) Dehydrogenation. 5. The alpha-dglucose and beeta-dglucose differ from each other due to difference in carbon atom with respect to its [1995] (a) conformation (b) configuration (c) number of OHgroups (d) size of hemiacetal ring 6. Which of the following protein destroy the antigen when it enters in body cell? [1995] (a) antibodies (b) insulin (c) chromoprotein (d) phosphoprotein 7. In reference to biological role, Ca 2+ ions are important in [1996] (a) triggering the contraction of muscles (b) generating right electrical potential across cell membrane (c) hydrolysis of ATP (d) defence mechanism 8. [D] (a) L-glucose + D-fructose (b) L-glucose + L-fructose (c) D-glucose + D-fructose (d) D-glucose + L-fructose 9. Areagent suitable for the determination of Nterminal residue of a peptide is [1996] (a) p-toluenesulphonyl chloride (b) 2, 4-dinitrophenylhydrazine (c) carboxypeptidase (d) 2, 4-dinitrofluorobenzene 10. The reactions of (a) oxygen and (b) carbon monoxide with haeme (the prosthetic group of haemoglobin) give (c) only oxygen-haeme complex (d) only carbon monoxide-haeme complex 11. Identify an element amongst the following which is responsible for oxidation of water to O2 in biological processes [1997] (a) Fe (b) Mn (c) Mo (d) Cu 12. Which one of the following chemical units is certainly to be found in an enzyme? [1997] (a)
2 260 (d) 40 (b) (c) (d) 13. The number of molecules of ATP produced in the lipid metabolism of a molecule of palmitic acid is [1998] (a) 130 (b) 36 (c) 56 (d) In DNA the complementary bases are [1998] (a) adenine and thymine; guanine and cytosine (b) uracil and adenine; cytosine and guanine (c) adenine and guanine; thymine and cytosine (d) adenine and thymine; guanine and uracil 15. Glucose molecule reacts with 'X' number of molecules of phenylhydrazine to yield osazone. The value of 'X' is [1998] (a) four (b) one (c) two (d) three 16. Which of the following is the sweetest sugar? (a) Sucrose (b) Glucose [1999] (c) Fructose (d) Maltose 17. In cells the net production of ATPmolecules generated from one glucose molecule is [1999] (a) 46 (b) 32 (c) Which of the following is a steroid hormone? (a) Cholesterol (b) Adrenaline [1999] (c) Thyroxine (d) Progesterone 19. The dominant cation in the blood plasma (extracellular fluid) is [1999] (a) potassium (b) calcium (c) magnesium (d) sodium 20. The number of essential amino acids in man is [2000] (a) 8 (b) 10 (c) 18 (d) Mg is present in which of the following : [2000] (a) Starch (b) Chlorophyll (c) Both (d) None 22. Which of the following gives positive Fehling solution test? [2001] (a) Protein (b) Sucrose (c) Glucose (d) Fats 23. [2001] (a) C N bond length in proteins is longer than usual bond length of the C N bond (b) Spectroscopic analysis shows planar structure of the NH O C group (c) C N bond length in proteins is smaller than usual bond length of the C N bond (d) None of the above
3 Which is correct statement? [2001] (a) Starch is a polymer of D-glucose (b) In cyclic structure of fructose, there are four carbons and one oxygen atom (c) Amylose is a component of cellulose (d) Proteins are composed of only one type of amino acids 25. Which of the following is correct about H bonding in nucleotide? [2001] (a) A--- A and T--- T (b) G--- T and A--- C (c) A--- G and T--- C (d) A--- T and G--- C 26. Cellulose is a polymer of [2002] (a) Glucose (b) Fructose (c) Ribose (d) Sucrose 27. Enzymes are made up of [2002] (a) Edible proteins (b) Proteins with specific structure (c) Nitrogen containing carbohydrates (d) Carbohydrates 28. Which is not a true statement? [2002] (a) alpha-carbon of alpha-amino acid is asymmetric (b) All proteins are found in L-form (c) Human body can synthesize all proteins they need (d) At ph= 7 both amino and carboxylic groups exist in ionised form 29. Glycolysis is [2003] (a) conversion of glucose to haem (b) oxidation of glucose to glutamate (c) conversion of pyruvate to citrate (d) oxidation of glucose to pyruvate 30. Phospholipids are esters of glycerol with [2003] (a) Three phosphate groups (b) Three carboxylic acid residues (c) Two carboxylic acid residues and one phosphate group (d) One carboxylic acid residue and two phosphate groups 31. Chargaff's rule states that in an organism [2003] (a) Amounts of all bases are equal (b) Amount of adenine is equal to that of thymine and the amount of guanine is equal to that of cytosine (c) Amount of adenine is equal to that of guanine and the amount of thymine is equal to that of cytosine (d) Amount of adenine is equal to that of cytosine and rthe amount of thymine is equal to that of guanine 32. Which one of the following structures represents the peptide chain? [2004] (a) (b) (c) (d) 33. Asequence of how many nucleotides in messenger RNAmakes a codon for an amino acid? [2004] (a) Three (b) Four (c) One (d) Two 34. The hormone that helps in the conversion of glucose to glycogen is [2004] (a) Cortisone (b) Bile acids (c) Adrenaline
4 262 (d) Insulin 35. The enzyme which hydrolyses triglycerides to fatty acids and glycerol is called [2004] (a) Maltase (b) Lipase (c) Zymase (d) Pepsin 36. The correct statement in respect of protein haemoglobin is that it [2004] (a) functions as a catalyst for biological reactions (b) maintains blood sugar level (c) acts as an oxygen carrier in the blood (d) forms antibodies and offers resistance to dieases 37. The helical structure of protein is stabilized by [2004] (a) dipeptide bonds (b) hydrogen bonds (c) ether bonds (d) peptide bonds 38. Which functional group participates in disulphide bond formation in proteins? [2005] (a) Thioester (b) Thioether (c) Thiol (d) Thiolactone 39. The cell membranes are mainly composed of (a) fats (b) proteins [2005] (c) phospholipids (d) carbohydrates 40. Which one of the following is a peptide hormone? [2006] (a) Testosterone (b) Thyroxin (c) Adrenaline (d) Glucagon 41. The human body does not produce [2006] (a) Vitamins (b) Hormones (c) Enzymes (d) DNA 42. [2006] (a) Diastase and Lipase (b) Pepsin and Trypsin (c) Invertase and Zymase (d) Amylase and Maltase 43. RNAand DNAare chiral molecules, their chirality is due to [2007] (a) chiral bases (b) chiral phosphate ester units (c) D-sugar component (d) L-sugar component. 44. Which one of the following is an amine hormone? (a) Thyroxine (b) Oxypurin [2008] (c) Insulin (d) Progesterone 45. In DNA, the complimentary bases are: [2008] (a) Adenine and thymine; guanine and cytosine (b) Adenine and thymine; guanine and uracil (c) Adenine and guanine; thymine and cytosine (d) Uracil and adenine; cytosine and guanine 46. The segment of DNAwhich acts as the instrumental manual for the synthesis of the protein is: [2009] (a) ribose (b) gene
![263 (c) nucleoside (d) nucleotide 47. Which of the following hormones contains iodine? [2009] (a) Testosterone (b) Adrenaline (c) Thyroxine (d) Insulin 48.](/docs-images/94/122302117/images/5-1.jpg "Which one of the following does not exhibit the phenomenon of mutarotation? [2010] (a) (+) Sucrose (b) (+) Lactose (c) (+) Maltose (d) ( ) Fructose 49.")
5 263 (c) nucleoside (d) nucleotide 47. Which of the following hormones contains iodine? [2009] (a) Testosterone (b) Adrenaline (c) Thyroxine (d) Insulin 48. Which one of the following does not exhibit the phenomenon of mutarotation? [2010] (a) (+) Sucrose (b) (+) Lactose (c) (+) Maltose (d) ( ) Fructose 49. Fructose reduces Tollen s reagent due to: [2010] (a) enolisation of fructose followed by conversion to glucose (having aldehydic group) by the base present in Tollen s reagent (b) asymmetric carbons (c) primary alcoholic group (d) secondary alcoholic group 50. Which one of the following statements is not true regarding (+) Lactose? [2011] (a) On hydrolysis (+) Lactose gives equal amount of D(+) glucose and D(+) galactose. (b) (+) Lactose is a E-glycoside formed by the union of a molecule of D(+) glucose and a molecule of D(+) galactose. (c) (+) Lactose is a reducing sugar and does not exhibit mutarotation. (d) (+) Lactose, C12H22O11 contains 8- OHgroups. 51. Which of the statements about "Denaturation" given below are correct? [2011 M] (a) Denaturation of proteins causes loss of secondary and tertiary structures of the protein. (b) Denturation leads to the conversion of double strand of DNAinto single strand (c) Denaturation affects primary strucrture which gets distorted (d) 52. Which one of the following, statements is incorrect about enzyme catalysis? [2012] (a) Enzymes are mostly proteinous in nature. (b) Enzyme action is specific. (c) Enzymes are denaturated by ultraviolet rays and at high temperature. (d) Enzymes are least reactive at optimum temperature. 53. Deficiency of vitamin B1 causes the disease [2012] (a) Convulsions (b) Beri-Beri (c) Cheilosis (d) Sterility 54. Which one of the following sets of monosaccharides forms sucrose? [2012] (a) (b) (c) (d) 55. In DNAthe linkages between different nitrogenous bases are: [NEETKar. 2013] (a) peptide linkage (b) phosphate linkage (c) H-bonding (d) glycosidic linkage
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Organic Molecules. 8/27/2004 Mr. Davenport 1
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