MCQs-Biology-Evolution and biochemistry multiple choice questions 1. 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 2. Which of the following elements make >99% of the dry living matter? H,O,N , C H, C, S, N H, N, Ca, Na C, N, H, Na None 3. Which of the following trace element isn’t found in any living organism on earth? Fe Co Cu Tc None 4. 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 5. Why carbon is present in most of the biochemicals? It is abundant in the environment It is the most suitable element for biomolecule formation because of its unique chemical properties All the carbon containing compounds have low activation energy thereby speeding up the reactions Other elements preferentially react with carbon None 6. 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 7. What is TRUE about the covalent bonds of silicon and carbon C-C covalent bonds are stronger than Si-Si bonds Si-Si covalent bonds are stronger than C-C bonds C-C covalent bonds are stable than Si-Si bonds C-C covalent bond has high bond energy than Si-Si- bonds All of the above 1 & 4 None 8. 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 9. 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 10. 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 11. 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 12. Most polymeric molecules are thermodynamically unstable but kinetically stable. True False None 13. 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 14. 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 15. Glucose phosphate is a part of the nucleic acids backbone True False None Please fill in the comment box below. Time's up
