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Summary AP Biology Unit 1 Test exam 2024
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AP Biology Unit 1 Test exam 2024
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AP Biology Unit 1 Test exam 2024water - -polar molecule
-polar colvalent bonds
-oxygen end is partial negative and the hydrogens have a partially positive end
-cohesive
polar covalent bonds - -opposite ends of the molecule have opposite charges
cohesion - -H bonding between H2O creates it (sticky)
-allows for the movement of water against gravity
-high surface tension
-water moves up a tree by transpiration (helped by ____)
adhesion - -H2O molecules form H bonds with other substances
~capillary action
~meniscus
~water climbs up fiber
solvent - -water is the universal one
,AP Biology Unit 1 Test exam 2024
-polar water molecules will surround the (+) and (-) ions causing the ions to
separate and dissolve
-dissolve solutes and create aqueous solutions
hydrophilic - -some molecules have an affinity for water
-polar and ionic molecules
-ex: cotton, cellulose, paper
hydrophobic - -some substances do not have an affinity for water
-nonpolar and non ionic substances
-ex: fat, glycerol, oils
floats - -less dense when it is solid, water ______
-forms crystal lattice structure
-important because oceans and lakes do not freeze solid
~insulates water below
~seasonal turnover of lakes
specific heat - -the amount of heat that must be absorbed or lost for 1g to change
its temperature by 1C
, AP Biology Unit 1 Test exam 2024
-water had high _____ due to H bonding
-resists change in temp
-moderates temp on earth
evaporative cooling - -organisms use to regulate their temperature
-ex: sweating
-water evaporates through a surface, cooling occurs
acidic - If [H+]>[-OH]
basic - If [-OH]>[H+]
pH scale - -how acidic or basic a solution is
-pure water, only 1 molecule in every 554 million is dissociated
-most biological fluids have 6-8
-each unit represents a 10-fold difference in H+ and -OH concentrations
neutral - -If concentration of 2 ions is equal
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