Water 1. Which of the following is facilitated by the ability of the membrane to selectively facilitate the passage of the water across? Salvation Osmosis Dilution Sequestration None 2. The importance of hydrogen bonds in biology is/are that, They are essential in the formation of the three dimension structures of the protein and other biomolecules High heat capacity of the water due hydrogen bonding confers resistant to sudden temperature changes in the body of the organism Formation of the stable cell membranes in aquatic solutions. All of the above None of the above None 3. Life of hydrogen bonding in water Increases with heating Decreases with heating Stabilised by heating No change in the life of H-bonding None 4. The fast mobility of the H3O+ is attributed to which of the following? Small molecular size High charge Proton Hopping mechanism All of the above None 5. Which of the following is not the strategy to transport the insoluble gases into the biological system Using an alternative gas Use of carrier proteins Chemical modification of the gaseous form All of the above. None 6. Which of the following mechanism is employed by multicellular animals to avoid osmotic lysis? Presence of non-expandable cell wall Increasing concentration of certain proteins in blood plasma Active transport of Na+ ions in the interstitial fluids. All of the above 2&3 None 7. What is the best thermodynamic explanation about the solubility of the non-polar compounds in the water System gains small enthalpy Entropy decreases ΔG is positive. All of the above None 8. Which is true about biologically important gases? N2, O2 and Co2 are the biologically important gases They are non polar Movement of them from gaseous phase to aqueous phase decrease the entropy All of the above None 9. Which of the following will have high heat of vaporisation? CH3OH CH3CH2OH Water CH3CH2CH2OH None 10. Which of the following leads to the formation of the dipole in the molecule? Electronegativity High molar mass Strong force of attraction between two molecules Hydrophobicity None Time's up
