MCQs-Biology-Evolution and biochemistry multiple choice questions 1. Carbon element, Has atomic number of six Has atomic mass of 12 Is considered as a standard in determining the atomic mass All of the above None of the above None 2. Which of the following is TRUE? >99% mass of the living matter is formed of H,O,N and C All the elements from periodic table are essential for the life on earth Only about 30 elements from periodic table participate in the making of life on earth 1 & 3 1 & 2 None 3. Which of the following is NOT correct about carbon element? It can attain a stable electronic configuration by sharing 4 electron It can form stable covalent bond than any other element with the valency of 4 Carbon can form 1, 2 and 3 stable covalent bond with itself It can not form a covalent bond with 4 different types of element limiting the variety of molecules it can form. None 4. Glucose phosphate is a part of the nucleic acids backbone True False None 5. Approximate time since the emergence of life on earth is, 4.5 billion years 3.5 billion years 20000 years 3.5 million years None 6. Polymers of the silicon, Don't form Are stable only at high temperature in water Are unstable in the presence of water Can support the life by forming long chain polymers. None 7. Which of the following defines the process of respiration The process of synthesis of oxygen from the splitting of two H2O molecules The transfer of electron to O2 by other energy yielding molecules Transfer of electron to any molecule with the emission of energy The process of oxidation through fermentation None 8. Which of the following is not the class of polymeric macromolecule? Proteins Nucleic acids Polysaccharides Fatty acids None 9. The common point between silicon and carbon is Both elements have valency of 4 Both elements have same bond energies Oxidation products of both the elements are soluble in water Both elements can form stable covalent bond in presence of water. None 10. Which of the following is NOT TRUE about silicon and carbon Both the elements belong to same group in the periodic table and may have common chemical properties Bothe elements have valency of 4 Silicon is an alternate element for the replacement carbon in biomolecules All of the above None of the above None 11. Water is present in abundant quantity in all the living organism and the reason is, Polarity and hydrogen bond forming ability of the water Size of the molecule Tetrahedral structure of the molecule None of the above None 12. Triple alpha process is A process of synthesis of carbon element A process of burning of hydrogen A fusion reaction that results in the formation of heavy nuclei A process of death of the star None 13. Which of the following property of the carbon is advantageous for life on earth? It can form long chain carbon compounds It can form ring structured compounds It forms stable covalent bonds with other elements All of the above None of the above None 14. Most polymeric molecules are thermodynamically unstable but kinetically stable. True False None 15. Which of the following is TRUE about the statements A and B? A. Upto >99% weight of the living organism is made of H, O, N and C. B. They form more stable covalent bonds with other elements Statement A is true and Statement B is an explanation Statement A and B are false Statement A and B are true but statement B is not the explanation of A Statement A is true and statement B is false None Please fill in the comment box below. Time's up
