Exam (elaborations)
2024 AQA A-LEVEL BIOLOGY TOPIC 1B – WATER EXAM WITH CORRECT ANSWERS
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2024 AQA A-LEVEL BIOLOGY TOPIC 1B – WATER EXAM WITH CORRECT ANSWERS
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2024 AQA A-LEVEL BIOLOGYTOPIC 1B – WATER EXAM WITH
CORRECT ANSWERS
What percentage of cells is made up of water? - CORRECT-ANSWERS80%
Why is water necessary in metabolic reactions? - CORRECT-
ANSWERSBecause water is a metabolite in lots of important metabolic
reactions, such as condensation and hydrolysis.
How does water cohesion work? - CORRECT-ANSWERSThe slightly negatively
charged oxygen atoms attract the slightly positive charged hydrogen atoms
of other water molecules, forming hydrogen bonds.
What is latent heat of vaporisation? - CORRECT-ANSWERSIt takes a lot of
heat energy to break the hydrogen bonds between water molecules, so
water has a high latent heat of vaporisation because a lot of energy is used
up when water evaporates.
Why is water having a high latent heat of vaporisation helpful for living
organisms? - CORRECT-ANSWERSIt means organisms can cool down by
losing water by evaporation, without losing too much.
Why is water a buffer? - CORRECT-ANSWERSWater is a buffer because it can
resist rapid changes in temperature.
This is because the hydrogen bonds can absorb a lot of energy, which gives
water a high SHC.
Why is water being a buffer useful to organisms? - CORRECT-
ANSWERSBecause it means that water doesn't experience rapid temperature
change. Water is therefore a good habitat because it is relatively stable, and
it means organisms don't experience rapid temperature change from the
water in our cells.
Why do ionic substances such as salt dissolve into water so easily? -
CORRECT-ANSWERSBecause the ions are made up of one positive atom and
one negative atom, which means the positive atom is attracted to the
negative oxygen, and the negative atom is attracted to the positive side.
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