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DP IB Biology: HL

Topic Questions

Home / IB / Biology: HL / DP / Topic Questions / 2. Molecular Biology / 2.1 Metabolism & Water / Structured Questions: Paper 2


2.1 Metabolism & Water

Question 1a

Marks: 2
a)

Suggest, with a reason, which label (I, II, or III) indicates a catabolic reaction.2-1-h-1a-paper-2

[2 marks]

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    Key Concepts
    Catabolism
    Anabolism

    Question 1b

    Marks: 1
    b)

    The diagram in part (a) illustrates how life is based on certain biochemical compounds. 

    Identify which major group of carbon-containing compounds is dominant in this diagram.

    [1 mark]

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      Key Concepts
      Carbon
      Carbon Compounds

      Question 1c

      Marks: 3
      c)

      Fats and cholesterol are essential to structures and functions in the bodies of animals and therefore need to be transported in blood.

      Discuss how these molecules are transported.

      [3 marks]

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        Question 1d

        Marks: 4
        d)

        Draw a labelled diagram of a generalised amino acid.

        [4 marks]

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          Question 2a

          Marks: 2
          a)

          Eastern collared lizards and pigs are two examples of animals that pant to keep cool.

          Suggest how panting helps these animals to cool down.

          [2 marks]

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            Question 2b

            Marks: 2
            b)

            Methane is a product of the incomplete breakdown of dead organic matter. Methane can be seen bubbling out of the water in volcanic springs. 

            Explain why, once methane has been produced, it bubbles off the water.

            [2 marks]

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              Question 2c

              Marks: 3
              c)

              Draw a labelled diagram showing cohesive forces between three water molecules.

              [3 marks]

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                Question 3a

                Marks: 2
                a)

                Outline the significance of the surface tension of water to living organisms.

                [2 marks]

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                  Question 3b

                  Marks: 2
                  b)

                  Using your knowledge of the properties of water, explain why dilute aqueous solutions (eg. glucose solution) are clear. 

                  [2 marks]

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                    Question 3c

                    Marks: 3
                    c)

                    Explain the relationship between the osmolarity of a solution and its water potential. 

                    [3 marks]

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                      Question 3d

                      Marks: 2
                      d)

                      Explain how water's high specific heat capacity helps to keep environmental conditions constant for organisms. 

                      [2 marks]

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                        Question 4a

                        Marks: 6
                        a)

                        Water exists in all three of its physical states in Nature.

                        Give an example of each physical state of water that exists in Nature and how it affects organisms and ecosystems.

                        [6 marks]

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                          Key Concepts
                          Properties of Water

                          Question 4b

                          Marks: 2
                          b)

                          Compare and contrast the properties of methane and water. 

                          [4 marks]

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                            Question 4c

                            Marks: 2
                            c)

                            Explain why a methane molecule (CH4) forms a tetrahedral shape.

                            [2 marks]

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                              Question 5a

                              Marks: 3

                              One mark is available for clarity of communication throughout this question.

                              a)

                              Multiple pieces of evidence are required for scientists to falsify theories.

                              Discuss the evidence that scientists used to falsify the theory of vitalism.

                              [3 marks]

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                                Question 5b

                                Marks: 4
                                b)

                                Deamination (the removal of an amino group from a molecule) and gluconeogenesis (the production of glucose from non-carbohydrate sources) are two reactions that occur in the liver.

                                From the information given, suggest with reasons, which metabolic reactions these are classified as.

                                [4 marks]

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                                  Key Concepts
                                  Anabolism
                                  Catabolism

                                  Question 5c

                                  Marks: 8
                                  c)

                                  Explain the properties of water that are key for the survival of an oak tree.

                                  [8 marks]

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                                    Key Concepts
                                    Properties of Water