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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
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?
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