Question 1

The figure below shows the structure of an ATP molecule.

Which part of the ATP molecule is shown within the dashed rectangle?

  A  

adenine

  B  

adenosine

  C  

ribose

  D  

deoxyribose

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Question 2

Which property of water makes it most suitable for transport in eukaryotic organisms?

  A  

density

  B  

ionisation

  C  

latent heat of vaporisation

  D  

solvent properties


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Question 3

As a frozen lake warms after a cold winter, mineral nutrients are brought to the surface.

Which properties of water contribute to this process?

1 - its greatest density is at 4°C

2 - it has a high specific heat capacity

3 - it is a solvent

4 - its molecules form hydrogen bonds

  A  

1 and 3 only

  B  

1 and 4 only

  C  

2 and 3 only

  D  

2 and 4 only


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Question 4

Why may fish living in ponds survive temperatures below 0°C in winter?

  A  

fish body tissues produce an enzyme which prevents blood from freezing

  B  

the ice on the pond surface insulates the water in the pond

  C  

the plants in the pond help to keep the water temperature above 0°C

  D  

the rocks in the pond warm up during the day and heat the water

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Question 5

The statements describe some of the properties of water.

1 - requires a lot of heat energy to evaporate

2 - retains a lot of heat energy

3 - is able to form hydrogen bonds with other water molecules

4 - is able to form hydrogen bonds with other polar and non-polar molecules

Which properties are important for transport in xylem?

  A  

1, 2, and 3 only

  B  

1, 2, and 4 only

  C  

1 and 3 only

  D  

3 and 4 only

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Question 6

Polar molecules form hydrogen bonds with each other.

Which properties of water result from its molecules being polar?

1 - good solvent

2 - high specific heat capacity

3 - high surface tension

4 - cohesive

  A  

1, 2, 3, and 4

  B  

1, 2, and 3 only

  C  

1, 2, and 4 only

  D  

3 and 4 only

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Question 7

Which properties of water are important for transport in xylem?

1 - cohesion

2 - adhesion

3 - high energy requirement for evaporation

4 - good solvent properties

  A  

1, 2, and 4

  B  

1 and 4 only

  C  

2, 3, and 4

  D  

2 and 3 only

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Question 8

Which statement correctly describes the process of adhesion?

  A  

attraction of water molecules to the impermeable walls of xylem tissue

  B  

attraction of water molecules to other water molecules in the xylem tissue

  C  

active transport of water molecules into phloem tissue

  D  

attraction of water molecules to other water molecules in the phloem tissue

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Question 9

A student wrote the following statement:

‘Water is polar because the oxygen side of the molecule is slightly positive in charge.’

Which option explains why this statement is not correct?

  A  

water must be non-polar because it can dissolve non-polar molecules like carbon dioxide

  B  

water must be non-polar because it can pass through the fatty acid tails of phospholipids


  C  

the oxygen side of the molecule is slightly negative in charge, not positive

  D  

water is not polar, it is charged


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Question 10

Water flows continuously through xylem vessels due to cohesion.

Which option is responsible for the cohesive properties of water?

  A  

covalent bonds

  B  

hydrogen bonds

  C  

hydrophobic interactions

  D  

ionic bonds

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