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Summary Water notes for MATSEC A-level Biology

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These are notes for the Biochemistry topic, water, for MATSEC A-level Biology.

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water

0 +




-8coralntdona
'H
X
nudrogen bond

yt-
8
4
+
/
H6

very high specific heat capacity

large amountof
energy required to increase temperature of water by 1.

When heated, energy is used to weaken H-bonds instead increasing ofwater molecules,
of so water acts as a buffer againstrapid

temperature changes.

allows water to acta s a habitatfor aquatic organisms, as itprovides a stable environment.


Ice is less dense than liquid water, so itfloats.

I also provides habitatfor organism).

insulates water below, preventing itfrom freezing so
organisms continueto livein the water under the ice.



very high latentheatofvaporisation
↳ water
requires a large amountofenergy to evaporate

provides a
cooling effecti n organisms, withoutthem losing a significantamountofwater leg: sweatevaporates from the surface of

the skin).


eg:respiration
Excellent solvent

↳ cells contain many dissolved substances (eg: chemicals involved in metabolic reactions and enzymes).
↳ bodies ofwater contain dissolved oxygen, used by aquatic organisms for respir
eg:Nat
he used to transport substances (eg:blood plasma contains dissolved CO2 erations, glucose, amino acids in the xylem vessels

contains dissolved mineral ions).

My used to make chlorophyll


Water molecules are cohesive
I allows
long columns water
of to travel in xylem vessels
↳ causes surface tension when in contactwith
air;surface ofwater can a habitatfor
acta s some insects logpondskaters).


Importantin metabolic reactions

reactanti n eg:hudrolusis, photosynthesis
a producti n eg:condensation, aerobic respiration

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