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6. How is water a good habitat?

  • Avoid land predators
  • It is abundant
  • It is a highly stable environment that doesn't change easily
  • There is very strong cohesion due to hydrogen bonding

7. What is a hydrolysis reaction?

  • When a bond is broken and a water molecule is used up
  • When a new bond is formed and a water molecules is used up
  • When a new bond is formed and a water molecule is released
  • When a bond is broken and a water molecule is released

8. Monomers in amylose are joined in a way which means the glucose chains have a helical structure. Why is this useful?

  • Amylose strands can pack closely together, making it good for storage
  • Amylose strands have high surface area, making the energy quickly released
  • Amylose strands can be transported as a group, so quicker release of energy
  • Amylose strands can travel through protein channels to exit the cell, making it good for transport

9. How do plants use cohesion?

  • To keep a store of water inside the xylem
  • To help transport water from their roots to their leaves
  • To drop water from their leaves into the ground towards their roots
  • To keep a store of water inside the phloem

10. What is latent heat of vaporisation?

  • The amount of energy needed to change one kilogram of a liquid substance to a gas
  • The amount of heat one kilogram of a substance must absorb or lose to change temperature by 1°C

11. Which of these is not an example of a condensation reaction

  • Condensation of two monosaccharides produces disaccharides
  • Condensation of fatty acids and monoglycerides produces lipids
  • Condensation of two maltose molecules produces glucose
  • Condensation of amino acids produces proteins

12. Which bonds join monosaccharides to form polysaccharides?

  • Glycosidic bonds
  • Ester bonds
  • Peptide bonds
  • Glucose bonds

13. Which of these is not a special property of water

  • Cohesive properties
  • Metabolic importance
  • Useful as a solvent
  • Heat of vaporisation
  • Abundant
  • High heat capacity

14. Which of these is not a feature of starch?

  • It is very large so cannot move out of the cell
  • They can act as energy stores
  • Provides quick-release energy
  • Does not change the water potential in a cell as it is insoluble
  • Made up of amylopectin and amylose, which are both alpha-glucose polysaccharides

15. True or False: Water is a good solvent because ions and polar molecules can easily dissolve in it

  • True
  • False

16. Which of these nucleic acids are only present in RNA?

  • Uracil
  • Cytosine
  • Thymine
  • Adenine
  • Guanine

17. What are simple sugars

  • Monosaccharides
  • Disaccharides
  • Polysaccharides

18. What does cohesion produce where water meets air?

  • Adhesion
  • Water vapour
  • Surface tension
  • Ice

19. Which reaction requires water?

  • Hydrolysis
  • Condensation

20. What cools faster: land or sea, and why?

  • Land cools faster as water has a much higher specific heat capacity
  • Sea cools faster as water has a much higher specific heat capacity
  • Land cools faster as water has a much higher latent heat of vaporisation
  • Sea cools faster as water has a much higher latent heat of vaporisation