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DP IB Biology: HL

Topic Questions

Home / IB / Biology: HL / DP / Topic Questions / 2. Molecular Biology / 2.6 Transcription & Translation / Structured Questions: Paper 2


2.6 Transcription & Translation

Question 1a

Marks: 2
a)

The following diagram shows the process of protein synthesis.

Av~i7Cjw_e-1a

i)

Identify stage X.

[1 mark]

ii)

State where in the cell stage X occurs.

[1 mark]

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    Question 1b

    Marks: 2
    b)

    Label molecule A and B in the diagram.

    [2 marks]

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      Question 1c

      Marks: 1
      c)

      State one difference in structure between DNA and molecule A identified at part b).

      [1 mark]

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        Question 1d

        Marks: 1
        d)

        Molecule B is synthesised from monomers.

        Identify the monomers of molecule B.

        [1 mark]

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          Question 2a

          Marks: 2
          a)

          The diagram below shows one of the stages in protein synthesis.

          e-2a

          i)

          Identify the stage of protein synthesis represented by the diagram.

          [1 mark]

          ii)

          State one reason for your answer in part i).

          [1 mark]

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            Key Concepts
            Transcription

            Question 2b

            Marks: 2
            b)

            Enzyme Y plays an important role during the stage of protein synthesis identified at part a) i).

            i)

            Identify enzyme Y.

            [1 mark]

            ii)

            State the role of this enzyme during protein synthesis.

            [1 mark]

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              Key Concepts
              Transcription

              Question 2c

              Marks: 2
              c)

              Label strands S and T of the DNA molecule.

              [2 marks]

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                Key Concepts
                Transcription

                Question 2d

                Marks: 2
                d)

                Explain the purpose of creating an mRNA copy of the genetic code on the DNA molecule.

                [2 marks]

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                  Key Concepts
                  Transcription

                  Question 3a

                  Marks: 2
                  a)

                  The following DNA base triplets form part of a gene coding for a polypeptide.

                  CCC  ATA  CTT  GGA

                  State the mRNA codons that would be transcribed from this section of the gene.

                  [2 marks]

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                    Question 3b

                    Marks: 2
                    b)

                    The gene mentioned in part a) formed an mRNA molecule that consisted of 180 nucleotides.

                    Calculate the number of amino acids that will be coded for by this gene. Show your working.

                    [2 marks]

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                      Question 3c

                      Marks: 2
                      c)

                      The table below shows mRNA codons and their corresponding amino acids.

                      mrna-codons-and-amino-acids-table

                      Use this table to state the amino acid sequence of the section of the gene given in part a).

                      [2 marks]

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                        Key Concepts
                        Deducing the Sequences

                        Question 4a

                        Marks: 2
                        a)

                        The diagram below shows the structure of a ribosome.e-4a

                        Identify parts A and B of the ribosome.

                        [2 marks]

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                          Key Concepts
                          Translation

                          Question 4b

                          Marks: 1
                          b)

                          State one substance that a ribosome is composed of.

                          [1 mark]

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                            Key Concepts
                            Translation

                            Question 4c

                            Marks: 2
                            c)

                            Describe the role of a ribosome in the process of protein synthesis.

                            [2 marks]

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                              Key Concepts
                              Translation

                              Question 4d

                              Marks: 1
                              d)

                              The mRNA molecule that is shown in the diagram at part a) carries the genetic code in the form of codons.

                              Define the term 'codon'.

                              [1 mark]

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                                Question 5a

                                Marks: 3

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

                                a)

                                Describe how the structure of a tRNA molecule contributes to the accuracy of the translation.

                                [3 marks]

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                                  Key Concepts
                                  Codons & Anticodons

                                  Question 5b

                                  Marks: 5
                                  b)

                                  Draw a labelled diagram of two nucleotides bonded together within the same DNA strand.

                                  [5 marks]

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                                    Question 5c

                                    Marks: 7
                                    c)

                                    Outline the three stages of polymerase chain reaction (PCR).

                                    [7 marks]

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