All are biological importance of water, EXCEPT:
Correct answer: D. Water expands at high temperature
- A. Polar molecule
- B. Universal solvent
- C. High specific heat and high heat of vaporization
- D. Water expands at high temperature
Explanation
Water has a unique property, as it expands when temperature falls below 4°C (39°F). Water is most heavy at 4°C ,therefore ice (solid water) is less dense than liquid water and this is the reason that ice floats in liquid water. Water body freezes on the surface at low temperature. Water has a high surface tension. In living cells this feature of surface tension allows a thin film of water to cover membranes and to keep them moist.
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The chapter covers water's polarity and biological roles, carbohydrates, lipids, proteins and nucleic acids, including their monomers, bonds, structures and functions. It also distinguishes RNA from DNA and explains conjugated molecules such as glycoproteins, glycolipids and nucleoproteins, which combine organic molecules with a non-protein component.
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