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DP IB Biology: SL

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Home / IB / Biology: SL / DP / Topic Questions / 1. Cell Biology / 1.2 Cells: Origin & Ultrastructure / Structured Questions: Paper 2


1.2 Cells: Origin & Ultrastructure

Question 1a

Marks: 2
a)

The diagram below is a drawing of an electron micrograph of a cell.

JU0wuM99_cell

Determine, with a reason, whether the cell is a eukaryotic cell.

[2 marks]

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    Question 1b

    Marks: 2
    b)
    Outline why compartmentalisation is an advantage for this cell. 

    [2 marks]

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      Question 1c

      Marks: 2
      c)

      During class, a student was examining structure X in the cell shown in part (a), and suggested that they could clearly see every detail at the highest magnification with their light microscope. 

      Explain why the student is not correct.

      [2 marks]

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        Question 1d

        Marks: 1
        d)

        Determine which process cell Y, seen in part (a), is undergoing.

        [1 mark]

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          Key Concepts
          Binary Fission

          Question 2a

          Marks: 2
          a)

          A student drew this eukaryotic cell.

          1-2-h-2a-paper-2

          Identify the structures E and G.

          [2 marks]

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            Question 2b

            Marks: 2
            b)

            Distinguish between the function of the structures identified in part (a).

            [2 marks]

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              Question 2c

              Marks: 3
              c)

              Spontaneous generation was once the widely accepted theory explaining the origin of life. It is now universally accepted that cells come from pre-existing cells. 

              Outline the evidence that has allowed this change in universal acceptance. 

              [3 marks]

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                Key Concepts
                Pasteur's Experiments

                Question 2d

                Marks: 3
                d)

                Miller and Urey’s experiments recreated the conditions thought to have existed on Earth prior to life.

                Explain how the apparatus they used provided evidence for how the first cells could have formed.

                [3 marks]

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                  Key Concepts
                  The First Cells

                  Question 3a

                  Marks: 4
                  a)

                  Below are three electron micrographs showing organelles found within a cell.

                  h-3a

                  i) Identify the organelles J, K, and L.

                  ii) Suggest how the structure of these organelles enables them to function efficiently.

                  [4 marks]

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                    Question 3b

                    Marks: 2
                    b)

                    Compare the structure and function of the rough endoplasmic reticulum and golgi apparatus.

                    [2 marks]

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                      Question 3c

                      Marks: 1
                      c)

                      The electron micrograph below is of a salivary gland of a mosquito.

                      h-3c

                      Identify the structures labelled P.

                      [1 mark]

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                        Question 4a

                        Marks: 3
                        a)

                        Draw a labelled biological diagram of the bacterial cell below.

                        bacteria-cell-to-draw

                        Pradana Aumars, CC0, via Wikimedia Commons

                        [3 marks]

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                          Question 4b

                          Marks: 2
                          b)

                          The image below is an electron micrograph of some cells.

                          iaqTSX4j_palisade-cell-label-h

                          https://upload.wikimedia.org/wikipedia/commons/thumb/4/4d/Angiosperm_Morphology_Adaxial_Epidermis_in_Ligustrum_%2836845195186%29.jpg/800px-Angiosperm_Morphology_Adaxial_Epidermis_in_Ligustrum_%2836845195186%29.jpg?20180623001402

                          Deduce, with a reason, the function of cell H.

                          [2 marks]

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                            Question 4c

                            Marks: 2
                            c)

                            The image below is a 3D-printed model of a cell dividing.

                            h-4c

                            Rosser1954, CC BY-SA 4.0 <https://creativecommons.org/licenses/by-sa/4.0>, via Wikimedia Commons

                            Deduce, with a reason, whether this model represents an animal cell, plant cell or neither.

                            [2 marks]

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                              Question 4d

                              Marks: 4
                              d)

                              This is an electron micrograph of an immune cell, responsible for specific immunity.

                              h-4d

                              i) Identify R

                              [1 mark]

                              ii) Deduce, with a reason, the function of this cell.

                              [3 marks]

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                                Question 5a

                                Marks: 3

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

                                a)

                                A student was examining this electron micrograph of a cell. They identified it as a plant cell.

                                cid2FrAV_h-5a

                                Evaluate the student’s decision to identify this as a plant cell.

                                [3 marks]

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                                  Question 5b

                                  Marks: 5
                                  b)

                                  Explain the Oparin-Haldine hypothesis scientists proposed for the origin of the first cells.

                                  [5 marks]

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                                    Key Concepts
                                    The First Cells

                                    Question 5c

                                    Marks: 7
                                    c)

                                    Euglena gracilis is a unicellular eukaryotic cell that is both heterotrophic and autotrophic.

                                    Discuss the theory that suggests how an organism could have evolved to be a eukaryotic cell that is both heterotrophic and autotrophic. 

                                    [7 marks]

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                                      Key Concepts
                                      Endosymbiotic Theory