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Year 11 Revision of Additional Biology (B2)
1. What is the function of:
A nucleus
The cytoplasm
A cell membrane

2. What do plant cells have in addition to the above structures? What are their functions?

3. Examples of specialised cells?

4. Why are there specialised cells?…

Page 2

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25. Nitrate ion deficiency causes?

26. Magnesium ion deficiency causes?

27. How are fast rates of photosynthesis produced in commercial greenhouses?

28. Where does the energy come from for most communities of living organisms?

29. What is a pyramid of biomass?

30. How does the biomass change at each level…

Page 3

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53. List the reasons for respiration

54. Enzymes are needed inside living cells to catalyse the reactions of protein synthesis. What building blocks ar
being linked together to form proteins?

55. What sort of enzymes catalyse reactions outside body cells?

55. Definition of digestion?

56. Substrate and breakdown products of…

Page 4

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80. Where is body temperature monitored?

81. If core body temperature is too high, what do the blood vessels supplying the skin capillaries do?

82. Why?

83. What happens at the sweat gland?

84. What word describes the blood vessels supplying skin capillaries when the core body temperature is too…

Page 5

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111 How does a cell in the testes divide to produce sperm?

112 In both mitosis & meiosis what happens to the chromosomes first?

113 One cell in the ovaries or testes divides to produce how many gametes?

114 What is fertilisation?

115 What is a…

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129 Huntington's disease is caused by a dominant allele. What does this mean for children of a person who has
. this allele?

130 Cystic fibrosis is caused by a recessive allele. If a child has cystic fibrosis, what are the genotypes of its
. parents?

131 What did Mendel…

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Year 11 Revision of Additional Biology (B2) ANSWERS
1. Controls the activities of the cell
Where most chemical reactions take place
Controls the passage of substances in & out of the cell
Where most energy is released in aerobic respiration
Where protein synthesis occurs

2. Cell wall: strengthens cell

Page 8

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19. Low temperature
Shortage of carbon dioxide
Shortage of light

20. Converted to starch
Used in respiration

21. Doesn't affect osmosis

22. To make amino acids which are then used to build up proteins

23. To make chlorophyll

24. Absorbed through the roots

25. Stunted growth

26. Yellow leaves


Page 9

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41. As carbon dioxide in respiration (of plants, animals, decomposers) & combustion (burning)

42. Biological catalysts

43. Lowers the activation energy

44. Proteins

45. Chains of amino acid

46. Folded into specific shape: there is a small part called the active site into which the substrate fits

47. High temperatures…

Page 10

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62. Creates an acidic pH for the stomach protease (pepsin) to work effectively
Kills harmful microorganisms

63. Emulsifies fats (breaks down large fat droplets to smaller fat droplets), creating a larger surface area
for lipase to work on

64. Liver

65. Gall bladder

66. Neutralises the acidity from the stomach,…


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