Chapter 5 Biological Macromolecules

Chapter (5): Biological macromolecules 1. What are formed in the reaction shown A. Ester bond B. Peptide bond C. hydrogen bond D. ionic bond 2. Sulfur can be found in: A. Proteins B. Starch C. DNA D. Cholesterols E. Fats 3. All of the following considered as lipids except of A. B. C. D. E. Fats Phospholipids Some waxes Cholesterols All of them are lipids 4. The sugar that have nitrogen containing appendage in their monomer A. B. C. D. Cellulose Starch Glycogen Chitin 5. Insoluble fibers is A. Carbs B. Cellulose C. Starch D. Glycogen E. A + B 6. Disulfide bridge can stabilize _________structure of protein A. Primary B. Secondary C. Tertiary D. Quaternary E. All of the above 7. Which of the following doesn’t contain amino acids A. B. C. D. E. Hemoglobin Collagens Enzymes RNA Insulin 8. Which of the following doesn’t contain true polymer? A. B. C. D. E. Protein Carbs Lipids DNA RNA 9. Lipids are a group of molecules that_______ A. B. C. D. E. Contain peptide bonds Mix poorly with water Contain polar parts All of the above A+B 10. How many water molecules needed to hydrolyze a polymer made of 4 monomers A. B. C. D. 4 3 2 1 11. In order to synthesize one fat molecule, the dehydration reaction needs remove________ water molecules A. B. C. D. 3 4 5 6 12. Secondary structure of protein form by hydrogen bonding between________ A. Backbone B. Side chain C. R group D. Amino groups E. None of the above 13. Which of the following is “Storage carbs in plant A. B. C. D. E. Starch Cellulose Glycogen Chitin Insulin 14. Enzymes are usually________ A. B. C. D. E. Carbs Fats Nucleic acid Monosaccharides Protein 15. Animals store glucose in the form of which macromolecule A. B. C. D. Amylose Glycogen Glycerol Cellulose 16. Which of the following is true about globular proteins A. It’s hydrophilic amino acids can be found at the surface B. It’s hydrophilic amino acids can be found in the core C. It’s hydrophobic amino acid can be found at the surface D. It’s hydrophobic amino acid can be found in the core E. A + D 17. Which of the following is mismatched A. B. C. D. Polypeptide =peptide bond Fats= ester bond Carbs= glycosidic linkage All of them are correct 18. Which of the following is true about DNA A. It’s 5 end contains OH B. It’s 3 end contains phosphate group C. It contains ribose sugar in its nucleotide D. It is found as a double helix molecule 19. The minimum number of carbons in monosaccharide is A. 4 B. 5 C. 3 D. 2 E. 1 20. In the formation of macromolecule what type of reaction would join two subunits together A. B. C. D. Hydrophobic reaction Hydrolysis reaction Dehydration reaction Denaturation reaction 21. Assuming that all of the below given compound had the same number of carbon atoms, which of the following has the most C-H bonds A. B. C. D. Unsaturated fat Poly saturated fat Polysaccharides Saturated fats 22. The different chemical and physical properties of amino acid depends on A. B. C. D. Carboxyl group Amino group Side chain Alpha Carbon 23. Aldose sugars and ketose sugars differ in A. Position of carbonyl group B. Number of carbonyl groups C. Position of carboxyl group D. Number of carboxyl groups 24. Cholesterol is a A. Triglyceride B. Phospholipid C. Steroid D. Proteins E. All of the above 25. Which of the following isn’t a disaccharide A. B. C. D. Sucrose Maltose Lactose Amylose 26. Which of the following is hydrophobic A. Cellulose B. Starch C. Animal fats D. Oils E. C + D 27. Which the following is true about saturated fats? A. It contains unsaturated fatty acid with double bond B. It contains saturated fatty acid with no kinks C. It is sold at room temperature E. All of them are correct except A 28.Oils are liquid at room temperature because they A. B. C. D. E. Are small molecules Are nonpolar Are hydrophobic Contains unsaturated fatty acid Contains saturated fatty acid 29. Which of the following is true : A. Amylose is branched molecule B. Amylopectin is unbranched molecule C. Starch contains alpha glucose in its monomer D. Human can digest starch E. Both C and D are correct 30. Misfolded protein involved in: A. Mad cow disease B. Parkinson’s disease C. Cystic fibrosis D. Alzheimer’s E. All of the above 31. which of the following found only in RNA: A. Ribose sugar and adenine B. Deoxyribose sugar and uracil C. Ribose sugar and uracil D. Ribose sugar and guanine E. Any of the above 32. Large organic molecules are usually assembled by polymerization of few kinds of simple subunits. Which of the following is exception to this statement ? A. A steroid B. Cellulose C. DNA D. An enzyme E. A contractile protein 33. The bonding of two amino acid molecules to form larger molecule requires : A. The release of water molecule B. The release carbon dioxide molecule C. The addition of nitrogen atom D. The addition of water molecule E. The release of nitrogen dioxide molecule 34. Which of the following is false about cellulose? A. It made of B-glucose B. It is the main component of plant cell wall C. Can form hydrogen bond with other parallel cellulose molecules D. it cannot be digested by human enzymes E. All of them are true 35. Which of the following not polymer A. Steroid B. Starch C. Cellulose D. Chitin 36. The bond at (X) is described as_______ bond A. B. C. D. Glycosidic Ester Peptide Ionic 37. Which of the following nitrogenous bases is purine A. C and G B. A and G C. U and T 38. What type of macromolecule carries out catalysis in biological systems A. Protein called enzymes B. Carbs called starches C. Lipids called steroids 39. What are the most diverse macromolecule in the cell A. B. C. D. Lipid Mineral salts Proteins Carbs 40. In a sucrose molecule, the linkage between glucose and fructose is: A. 1-4 glycosidic B. 1-2 glycosidic C. 1-6 glycosidic D. Peptide E. Ester 41. The figure represents A. B. C. D. Purine Pyrimidine Sugar Fat 42. Molecule with which functional group may form polymers via dehydration reactions ? A. hydroxyl group B. carbonyl group C. Carboxyl group D. Either carbonyl or carboxyl group E. Either carboxyl or hydroxyl group 43. Which of these molecules is not formed by dehydration reaction ? A. Fatty acid B. Disaccharide C. DNA D. Protein E. Amylose 44. Which of these classes of biological molecule consist of both small molecules and macromolecules polymers ? A. Lipids B. Carbohydrates C. Protein D. Nucleic acid E. Lipids, carbohydrates, protein and nucleic acid all consist of only macromolecular polymer 45. Which of the following is not a polymer ? A. Glucose B. Starch C. Cellulose D. Chitin E. DNA 46. Which of the following is true about sickle cell anemia? A. It is caused by point mutation that lead to substitution of one amino acid B. It is involved abnormal alpha subunit C. Hemoglobin molecules aggregate in a long fiber D. Reduced capacity for oxygen transport E. All of them are true except of (B) 47. Which of the following categories includes all other in the list? A. Disaccharide B. Polysaccharide C. Starch D. Carbohydrate 48. Which is the chemical reaction mechanism by which cell make polymer from monomers ? A. Phosphodiester linkages B. Hydrolysis C. Dehydration reaction D. Ionic bonding of monomers E. The formation of disulfide bridges between monomers 49. According to the figure A) Which bond is peptide bond? A. B. C. D. E. A B C D E B) Which bond is closest to the amino terminus of the molecule? A. B. C. D. E. A B C D E C) At which bond water needed to be added to achieve hydrolysis of the peptide A. B. C. D. E. A B C D E 50. How many molecules of water are needed to completely hydrolyze a polymer that is 11 monomers long? A. 12 B. 11 C. 10 D. 9 E. 8 51. Which of the following is best summarizes the relationship between dehydration reaction and hydrolysis ? A. Dehydration reaction assemble polymers, and hydrolysis reaction break down polymers B. Dehydration reaction eliminate water from lipid membranes, and hydrolysis make lipid membranes water permeable C. Dehydration reaction can occur only after hydrolysis D. Hydrolysis creates monomers, and dehydration reaction break down polymers E. Dehydration reaction ionize water molecules and add hydroxyl group to polymers; hydrolysis reaction release hydroxyl group from polymers 52. Lactose, a sugar in milk, is composed of one glucose molecule joined by a glycosidic linkage to one galactose molecule. How is lactose classified? A. As a pentose B. As a hexose C. as a monosaccharide D. As a disaccharide E. As a polysaccharide 53. Human sex hormone can be classified as A. B. C. D. E. Protein Lipid Steroids B+C A+ B 54.The simplest amino acid is A. B. C. D. Glycine Serine Valine Lysine 55. which of the following is true of both starch and cellulose ? A. They are both polymers of glucose B. They are cis-trans isomers of each other C. They can both be digested by humans D. They are both used for energy storage in plants E. They are both structural components of the plant cell wall 56. which of the following statements is true for the class of biological molecules known as lipids? A. They are insoluble in water B. They are made from glycerol, fatty acid, phosphate C. They contain less energy than proteins and carbohydrates D. They are made by dehydration reaction E. They contain nitrogen 57. when protein lose its native shape it called: A. Denaturation B. Renaturation C. Destruction D. Deformation E. None of the above 58. Phospholipids contain : A. Glycerol B. 2 hydrocarbon tails C. Phosphate group D. Amino group E. All of them except of (D) 59. There are 20 different amino acids, what makes one amino acid different from another A. B. C. D. Different side chain (R group) attached to COOH group Different side chain (R group) attached to amino groups Different side chain (R group) attached to a carbon Different asymmetric carbons 60. Upon chemical analysis, a particular polypeptide was found to contain 100 amino acids, how many peptide bonds are present in this protein A. B. C. D. E. 100 101 99 98 97 61. If a DNA sample were composed of 10% thymine, what would be the percentage of guanine A. B. C. D. 10 20 40 80 62. which of the following polymers contain nitrogen ? A. Starch B. Glycogen C. Cellulose D. Chitin E. Amylopectin 63. a molecule with the chemical formula C6H12O6 is probably a: A. Carbohydrate B. Lipid C. Monosaccharide D. Carbohydrate and lipid only E. Carbohydrate and monosaccharide only 64. The molecular formula for glucose is C6H12O6. What would be the molecular formula for a polymer made by linking 10 glucose by dehydration reaction (CHO) A. B. C. D. (60 120 60) (6 12 6) (60 102 51) (60 100 50) 65. A: A represent—-—— bond B: B represent———— C: C represent ————- 66.The figure shows A. B. C. D. E. Phospholipid bilayer The structure of cell membrane Unsaturated fats Cholesterols A+B 67.The figure shows A.RNA 3d shape B. Collagen C. Cellulose D. DNA 68. The figure represents A. Nucleotide B. Nucleoside mono phosphate C. Nucleoside diphosphate D. A+ B 69. Which of the following pairs of base form normal double helix of DNA A. B. C. D. 5’-AGCT-3’ with 5’-TCGA-3’ 5’-GCGC-3’ with 5’-TATA-3’ 5’-ATGC-3’ with 5’-GCAT-3’ All of the above are correct 70. The molecular formula for a polymer of 10 ribose molecules (C H O) A. 6 12. 6 B. 5. 10 5 C. 60 120 60 D. 60 102 51 E. 50 92 41 71. Which of the molecules shown in the figure is the monomer of cellulose A. B. C. D. E. A B C D E 72. The tertiary structure of protein is the Unique 3d shape of the fully folded polypeptide 73. RNA molecules can find as a 3D shape due to : A. Hydrogen bonds between complementary base pairing Answers 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 32. 33. 34. 35. 36. 37. 38. 39. 40. 41. 42. 43. 44. 45. 46. B A E D B C D C B B A A A E B E D D C C D C A C D E E D E E C A A E A B B A C B B E A B A E 47. 48. 49. 50. 51. 52. 53. 54. 55. 56. 57. 58. 59. 60. 61. 62. 63. 64. 65. 66. 67. 68. 69. 70. 71. D C A) C B) A C) C C A D D A A A A E C C C D E C A: Peptide bond B: C terminus C: N terminus E B A C E A