Chapter 3 outline - Chapter 3 Water and the Fitness of the...

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Chapter 3: Water and the Fitness of the Environment
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The Importance of Water Water is the substance that makes possible life as we know it here on Earth All organisms familiar to us are made of mostly water and live in an environment dominated by water Water is the biological medium here on Earth, and possible on other planets as well
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The Effects of Water’s Polarity A hydrogen bond forms when the oxygen of one water molecule is electrically attracted to the hydrogen of a nearby molecule (+ to -) Hydrogen bonding between water molecules is the basis for water’s unusual properties Cohesion Adhesion Surface Tension
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Organisms in Relation to Cohesion Hydrogen bonding makes water molecules stick to each other, and this cohesion helps pull water upward in the microscopic vessels of plants Hydrogen bonding is also responsible for water’s surface tension Adhesion plays a role by countering the downward pull of gravity
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This note was uploaded on 12/02/2009 for the course SCI 90210 taught by Professor Durkka during the Spring '09 term at École Normale Supérieure.

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Chapter 3 outline - Chapter 3 Water and the Fitness of the...

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