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Water is a major component of cells,
Properties of Water typically forming between 70 and 95% of
the cell mass. It provides an
environment for those organisms that
live in water.
Small molecular size however
due to hydrogen bonding water
is a liquid, NOT a gas!
Small molecular structure and liquid
state medium for chemical
reactions including cell biochemistry
and molecular evolution
Excellent solvent for polar molecules and ions because of its dipole charges
Non polar molecules are insoluble in water, and will collect together in an aqueous
medium (hydrophobic interactions). Such interactions of non-polar side groups in
amino acids stabilise protein structure…read more

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It serves as a transport medium in blood, lymph, xylem and phloem.
Because hydrogen bonding restricts
water molecule movement, water The large amount
needs to absorb a relatively large of heat required to
amount of heat to change temperature. make water
This property increases the evaporate makes
temperature stability of habitats and it a good coolant
internal body conditions, resisting (sweating /
temperature change when the external panting)
temperature changes…read more

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Conversely a large amount of heat must be withdrawn
from water to make it freeze, an advantage for both
the bodies or organisms and those living in water
Ice is less dense than water, thus floating on water
and insulating it (cage structure). This reduces the
tendency of large bodies of water (and the organisms
they contain) to freeze.
Because of their dipole charges water molecules have
high cohesion, and thus high surface tension. This
allows water columns to move up xylem vessels
without `breaking', and some organisms to move about
on the surface of water (pond skaters)…read more


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