Chapter 2 - The Chemistry of Life (71 MCQs) PDF

Chapter 2: Chemistry of Life The organic molecules 6. The sugar found in RNA is: a. Ribose 1. Which three elements are often found in b. Deoxyribose organic compounds?...

Chapter 2: Chemistry of Life The organic molecules 6. The sugar found in RNA is: a. Ribose 1. Which three elements are often found in b. Deoxyribose organic compounds? c. Ribulose a. Carbon, hydrogen, and oxygen d. Erythrose b. Nitrogen, hydrogen, and oxygen c. Carbon, hydrogen, and iron 7. Linkage between two monosaccharides, is: d. Nitrogen, Hydrogen , and phosphorus a. Ionic bond b. Covalent bond 2. Which of the following is the most abundant c. Hydrogen bond biomolecule on the earth? d. Glycosidic bond a. Lipids b. Proteins 8. Glycosidic bond is present in: c. Carbohydrates a. Lactose d. Nucleic acids. b. Maltose c. Sucrose d. All of these Carbohydrates 9. Which of these are correct combinations of monosaccharides to form disaccharides? 3. Units of carbohydrates which cannot be further a. Glucose + Glucose = Maltose hydrolyzed to simpler compounds are: b. Glucose + fructose = Sucrose a. Disaccharides c. Glucose + galactose=Lactose b. Polysaccharides d. All of the above c. Monosaccharides d. Oligosaccharides 10. Sucrose consists of: a. Glucose + glucose 4. Which of the following are glucose and b. Glucose + fructose fructose? c. Glucose + galactose a. Monosaccharides d. Glucose + mannose b. Disaccharide c. Oligosaccharides 11. Maltose consists of: d. Polysaccharides a. Glucose + glucose b. Glucose + fructose 5. The sugar found in DNA is: c. Glucose + galactose a. Xylose d. Glucose + mannose b. Ribose c. Deoxyribose 12. Lactose is an example of: d. Ribulose a. Polysaccharides b. Monosaccharides c. Disaccharides d. Oligosaccharides 1 13. The sugar found in milk is: 19. Starch and glycogen are polymers of: a. Galactose a. Fructose b. Glucose b. Mannose c. Fructose c. Glucose d. Lactose d. Galactose 14. Galactose is a main constituent of 20. A significant source of starch among a. Milk sugar vegetables is b. Honey a. Radish c. Cane sugar b. Spinach d. Chitin c. Potato d. Cauliflower 15. Polysaccharides are: a. Polymers 21. The most abundant carbohydrate found in b. Acids nature is: c. Proteins a. Starch d. Oils b. Glycogen c. Cellulose 16. Which of the following carbohydrates is d. Chitin not a polysaccharide? a. Starch 22. Cellulose is obtained from? b. Glycogen a. Animals c. Cellulose b. Microorganisms d. Maltose c. Plants d. Bacteria 17. Starch is an example of? a. Monosaccharide 23. The tissues with the highest total glycogen b. Disaccharide content are c. Oligosaccharides a. Muscle and kidneys d. Polysaccharides b. Kidneys and liver c. Liver and muscle 18. Which of the following statements is true d. Brain and Liver about polysaccharides? a. Polysaccharides are polymers of glucose 24. In what form is glucose stored in animal b. Polysaccharides are polymers of amino muscles and liver cells? acids a. Glucagon c. Polysaccharides are polymers of peptide b. Vitamins bonds c. Glycogen d. Polysaccharides are polymers of disulfide d. Starch bridges 25. Dietary fibers are rich in: a. Cellulose b. Glycogen c. Starch d. Proteoglycans 2 26. Dietary fiber denotes 32. In mammals, the major fat in adipose a. Undigested proteins tissues is b. Plant cell components that cannot be a. Phospholipid digested by own enzymes b. Triacylglycerol c. All plant cell wall components c. Cholesterol d. All non-digestible water insoluble d. Sphingolipids polysaccharide 33. Triglycerides are 27. A high fiber diet is associated with reduced a. Heavier than water incidence of b. Major constituents of membranes a. Cardiovascular disease c. Non-polar b. C.N.S. disease d. Hydrophilic c. Liver disease d. Skin disease 34. The major storage form of lipids is a. Esterified cholesterol 28. Which type of prosthetic group is present b. Glycerophospholipids in glycolipids? c. Triglycerides a. Carbohydrate d. Sphingolipids b. Protein c. Phosphoric acid 35. Lipids are stored in the body mainly in the d. None of the above form of: a. Phospholipids b. Glycolipids c. Triglycerides Lipids d. Fatty acids 29. Lipids have the following properties: 36. How are triglycerides formed? a. Insoluble in water and soluble in fat solvent a. Triglycerides are formed through b. High energy content dehydration synthesis which results in the c. Structural component of cell membrane loss of water d. All of these b. Triglycerides are formed through hydrolysis in the addition of water 30. Maximum energy produced by c. Triglycerides are formed through a. Fats dehydration synthesis, which results in the b. Carbohydrates addition of water c. Proteins d. Triglycerides are formed through hydrolysis, d. Nucleic acids which results in the production of water 31. Lipid stores are mainly present in 37. Which of the following protects our heart a. Liver and kidneys from injury? b. Brain a. Skin c. Muscles b. Muscles d. Adipose tissue c. Lubricants d. Fat 3 38. Which of the following acts as a thermal 45. The chemical classification of hormones insulator in mammals? does NOT include a. Skin a. Glucose-containing hormones b. Fat b. Cholesterol-containing hormones c. Lipids c. Steroid hormones d. Proteins d. Protein-based hormones 39. Phospholipids occur in a. Myelin sheath b. Stabilizes chylomicrans Proteins c. Erythrocyte membrane d. All of these 46. Proteins are composed of which biomolecule? 40. The importance of phospholipids as a. Fats constituent of cell membrane is because they b. Amino acids possess c. Lipids a. Fatty acids d. Vitamins b. Both polar and nonpolar groups c. Glycerol 47. Which of the following statements is true d. Phosphoric acid about proteins? a. Proteins are polymers of glucose 41. Catabolism of cholesterol yields some b. Proteins are polymers of amino acids important physiological products like: c. Proteins are polymers of peptide bonds a. Formation of bile acids d. Proteins are polymers of disulfide bridges b. Formation of steroid hormones c. Formation of vitamin C 48. The linkage which joins two amino acid d. All of the above units is called: a. Peptide bond 42. Bile acid is derived from: b. Covalent bond a. Cholesterol c. Ionic bond b. Amino acids d. Hydrogen bond c. Fatty acids d. Bilirubin 49. What is a bond between amino acids called? 43. Bile is produced by: a. Ionic bond a. Liver b. Acidic bond b. Gall-bladder c. Peptide bond c. Pancreas d. Hydrogen bond d. Intestine 50. The resulting molecule after joining two 44. The cholesterol molecule is: amino acid units is called a/an a. Benzene derivative a. Amino group b. Quinoline derivative b. Carboxyl group c. Steroid c. Peptide bond d. Straight chain acid d. Dipeptide 4 51. The protein present in hair is: 58. Pepsin and trypsin are enzymes that are a. Keratin characterized as b. Elastin a. Carbohydrates c. Myosin b. Triglycerides d. Tropocollagen c. Phospholipids d. Proteins 52. Which of the following is the example of defense proteins? a. Dehydrogenase b. Myoglobin Nucleotides c. Hemoglobin d. Immunoglobin 59. The building block of RNAs is called a. An Amino acid 53. Which of the following is the example of b. A nucleotide storage proteins? c. A phospholipid a. Dehydrogenase d. Glycerol b. Myoglobin c. Hemoglobin 60. Nucleotides have how many components? d. Immunoglobin a. 2 b. 3 54. Which of the following is the example of c. 4 transport proteins? d. 5 a. Dehydrogenase b. Myoglobin 61. Considering the structure of DNA, each c. Hemoglobin strand is made up of d. Immunoglobin a. Deoxyribose sugar b. Phosphate unit 55. How many amino acids make up a protein? c. Nitrogen base a. 10 d. All of above b. 20 c. 30 62. In the structure of DNA, how many strands d. 50 are twisted around each other? a. One 56. All proteins contain the: b. Two a. 20 amino acids c. Three b. Different amino acids d. Four c. 300 Amino acids occurring in nature d. Only a few amino acids 63. Strand of RNA is made of: a. Ribose sugar 57. Which of the following is true about b. Phosphate unit enzymes? c. Nitrogen base a. Proteins d. All of above b. Nucleic acids c. Carbohydrates d. DNA molecule 5 64. Existence of RNA is in the form of 71. Oxidative phosphorylation results in the a. Single strand formation of: b. Double strand a. Oxygen c. Triple strand b. AMP d. Four strands c. ADP d. ATP 65. Which one of the following nucleotide bases is not found in DNA? a. Adenine b. Uracil c. Guanine d. Cytosine 66. Which one of the following nucleotide bases is not found in RNA? a. Adenine b. Thymine c. Guanine d. Cytosine 67. Ribosomes are important because they help in: a. Movement b. Respiration c. Protein synthesis d. Grow 68. Ribosome are made up of: a. RNA, DNA and protein b. RNA and DNA c. DNA and protein d. RNA and protein 69. ATP is a a. Nucleoside b. Nucleotide c. Vitamin d. Nucleic acid 70. ATP is made of: a. Ribose sugar b. 3 Phosphate units c. Adenine base d. All of above 6