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DP IB Biology: HL

Topic Questions

Home / IB / Biology: HL / DP / Topic Questions / 1. Cell Biology / 1.3 Cells: Membrane Structure & Transport / Structured Questions: Paper 2


1.3 Cells: Membrane Structure & Transport

Question 1a

Marks: 2
a)

Define the following terms:

i) hydrophilic

ii) hydrophobic

[2 marks]

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    Key Concepts
    Amphipathic Properties

    Question 1b

    Marks: 2
    b)
    Draw a labelled diagram of a phospholipid molecule.

    [2 marks]

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      Key Concepts
      Amphipathic Properties

      Question 1c

      Marks: 1
      c)
      State the property of phospholipids that causes them to form bilayers when placed in water.

      [1 mark]

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        Key Concepts
        Amphipathic Properties

        Question 1d

        Marks: 2
        d)
        State the functions of cholesterol in animal membranes.

        [2 marks]

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          Question 2a

          Marks: 3
          a)
          Define active transport. 

          [3 marks]

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            Key Concepts
            Active Transport

            Question 2b

            Marks: 3
            b)
            List three factors that affect the rate of diffusion of substances across a membrane.

            [3 marks]

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              Key Concepts
              Passive Transport

              Question 2c

              Marks: 1
              c)

              State the name of the process by which materials are transported from structures S to R in the diagram below.

              1-3-e-2c-paper-2

              [1 mark]

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                Key Concepts
                Bulk Transport

                Question 2d

                Marks: 1
                d)
                Name one material that could be transported from structure S to R.

                [1 mark]

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                  Key Concepts
                  Bulk Transport

                  Question 3a

                  Marks: 2
                  a)

                  The below diagram shows the plasma membrane of an Amoeba sp and some molecules of a small, nonpolar substance known as substance X.

                  1-3-e-3a-paper-2

                  State:
                  i) the direction substance X would move
                  ii) the process by which substance X would move

                  [2 marks]

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                    Key Concepts
                    Passive Transport

                    Question 3b

                    Marks: 2
                    b)
                    List two possible examples of substance X.

                    [2 marks]

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                      Key Concepts
                      Passive Transport

                      Question 3c

                      Marks: 2
                      c)

                      Amoeba requires potassium ions to assist with detecting prey.

                      Outline how these ions would be transported across the membrane shown in part (a).

                      [2 marks]

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                        Key Concepts
                        Passive Transport

                        Question 3d

                        Marks: 1
                        d)

                        To feed upon bacteria, Amoeba uses pseudopodia to engulf the bacteria.

                        State the process used to engulf the bacteria.

                        [1 mark]

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                          Key Concepts
                          Bulk Transport

                          Question 4a

                          Marks: 4
                          a)

                          Label the diagram below.1-3-e-4a-paper-2

                          [4 marks]

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                            Question 4b

                            Marks: 2
                            b)

                            The electron micrograph below shows part of a yeast cell’s membrane and cytoplasm. 

                            Bakers yeast wall-membrane-cytoplasm

                            Tgru001, CC0, via Wikimedia Commons

                            Outline how micrographs like this were used as evidence to falsify the Davson-Danielli model.

                            [2 marks]

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                              Question 4c

                              Marks: 3
                              c)

                              During class, a group of students investigating the impact of different salt concentrations on the mass of celery, collected the results into the table below.

                              Concentration of salt / mol dm-3

                              Initial mass / g

                              Final mass / g

                              Mass change / g

                              Mass change / % 

                              0.0

                              12.2

                              14.5

                              + 2.3

                              + 18.9

                              0.2

                              10.0

                              11.7

                              + 1.7

                              + 17.0

                              0.4

                              9.6

                              9.3

                              - 0.3

                              - 3.1

                              0.6

                              11.3

                              10.5

                              - 0.8

                               

                              0.8

                              12.5

                              11.2

                              - 1.3

                              - 10.4

                              1.0

                              10.7

                              8.5

                              - 2.2

                              - 20.6

                              i) Calculate the percentage change in mass for 0.6 mol dm-3

                              [1 mark]

                              ii) Estimate, with a reason, the osmolarity of the celery tissue

                              [2 marks]

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                                Question 4d

                                Marks: 2
                                d)

                                The diagram below is a student's drawing of three celery cells seen under a light microscope at the end of the investigation from part (c).1-3-e-4d-paper-2

                                 

                                Deduce, with a reason, which salt concentration/s these cells have been immersed in.

                                [2 marks]

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                                  Question 5a

                                  Marks: 5
                                  a)

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

                                  Outline the functions of five different membrane proteins.

                                  [5 marks]

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                                    Key Concepts
                                    Membrane Proteins

                                    Question 5b

                                    Marks: 4
                                    b)

                                    Distinguish between the following two models of the plasma membrane:

                                    Davson-Danielli and Singer-Nicolson.

                                    [4 marks]

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                                      Question 5c

                                      Marks: 6
                                      c)

                                      Compare the passive transport of substances across membranes, using named examples.

                                      [6 marks]

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