Multiple Choice Questions on Biomolecules

Multiple Choice Questions on Biomolecules 1. Which is distributed more widely in a cell? a) DNA b) RNA c) Chloroplast d) Sphaerosomes 2. What are the most diverse molecules in the cell? a) Lipids b) Proteins c) Carbohydrates d) Mineral salts 3. Which of the following is a reducing sugar? a) Sucrose b) Galactose c) β-Methyl galactocidase d) Gluconic acid 4. The four elements that make up 99% of all elements found in a living system are a) C, H, O and P b) C, H, O and S c) C, H, O and N d) C, N, O and P 5. Glycogen is a polymer of a) Galactose b) Glucose c) Fructose d) Sucrose 6. Carbohydrates, the most abundant biomolecules on earth, are produced by a) all bacteria, fungi and algae b) viruses, fungi and bacteria c) some bacteria, algae and green plant cells d) Fungi, algae and green plant cells 7. Which of the following is the simplest amino acid? a) Alanine b) Glycine c) Asparagine

d) Tyrosine 8. Which is wrong about nucleic acids? a) DNA is single stranded in some viruses b) one turn of Z DNA has 12 bases c) RNA is double stranded occasionally d) Length of one helix is 45Ao in B-DNA 9. A segment of DNA has 120 adenine and 120 cytosine bases. The total number of nucleotides present in the segment is a) 480 b) 240 c) 120 d) 60 10. Mineral associated with cytochrome is a) Cu b) Mg c) Fe d) Cu and Ag Answers 1. b) RNA 2. b) Proteins 3. b) Galactose 4. c) C, H, O and N 5. b) Glucoseb) Glucose 6. c) some bacteria, algae and green plant cells 7. b) Glycine 8. d) Length of one helix is 45Ao in B-DNA 9. a) 480 10. c) Fe

Multiple Choice Questions on Biomolecules 1. In double helix of DNA, the two strands are a) coiled around a common axis b) coiled differently c) coiled over protein sheath d) coiled around each other 2. Living cell contains 60-95% water. Water present in human body is a) 60-65% b) 70-75% c) 65-70% d) 75-80%

3. Nucleotides are building blocks of nucleic acids. Each nucleotide is a composite molecule formed by a) base- sugar- phosphate b) base- sugar- OH c) sugar-phosphate d) (base sugar phosphate)n 4. The major role of minor elements inside living organisms is to act as a) Co factors of enzymes b) Binder of cell structure c) Constituent of hormones d) Building blocks of important amino acids 5. Lipids are insoluble in water because lipid molecules are a) Hydrophilic b) Neutral c) Zwitter ions d) Hydrophobic 6. ATP is a) vitamin b) Enzyme c) Nucleic acid d) Nucleotide 7. Which of the following have carbohydrate as prosthetic group a) Glycoprotein b) Lipoprotein c) Nucleoprotein d) Chromoprotein 8. Lactose is composed of a) glucose + galactose b) fructose+ galactose c) glucose + fructose d) glucose + glucose 9. In which of the following groups are all polysaccharides? a) Sucrose, glucose and fructose b) Maltose, lactose and fructose c) glycogen, sucrose and maltose d) Glycogen, cellulose and starch 10. Amino acids are produced from a) Proteins b) Fatty acids c) Essential oils d) α-keto acids 11. In RNA, thymine is replaced by

a) adenine b) guanine c) cytosine d) uracil 12. Which purine base is found in RNA? a) Thymine b) Uracil c) Cytosine d) Guanine 13. Which of the following nucleotide sequences contains four pyrimidine bases? a) GATCAATGC b)UAGCGGUAA c) GCUAGACAA d) both b and c 14. Cellulose, the most important constituent of plant cell wall is made up of a) Branched of glucose molecules linked by β-1, 4 glycosidic bond in straight chain and α-1,6 glycosidic bond at the site of branching b) Unbrached chain of glucose molecules linked by β--1,4 glycosidic bond c) Branched chain of glucose molecules linked by β-1, 4 glycosidic bond d) Branched chain of glucose molecules linked by β-1, 4 glycosidic bond in straight chain and α-1,6 glycosidic bond at the site of branching 15. Enzymes, vitamins and hormones can be classified into a single category of biological chemicals, because all of these a) Enhance oxidative metabolism b) Help in regulating metabolism c) are conjugated proteins d) are exclusively synthesised in the body of a living organism as at present Answers 1. a) coiled around a common axis 2. c) 65-70% 3. a) base- sugar- phosphate 4. a) Co factors of enzymes 5. d) Hydrophobic 6. d) Nucleotide 7. a) Glycoprotein 8. a) glucose + galactose 9. d) Glycogen, cellulose and starch 10. a) Proteins 11. d) uracil 12. d) Guanine 13. a) GATCAATGC 14. b) Unbrached chain of glucose molecules linked by β--1,4 glycosidic bond 15. b) Help in regulating metabolism