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DNA & Proteins Revision

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  • DNA replication is a "semi-conservative' process. What does this mean?
    The new DNA is made of one old strand and one new strand
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  • What is the name of C?
    Deoxyribose Sugar
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  • What is the name of A?
    Phosphate Group
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  • What is the name of B?
    Nitrogen Base
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  • Complete the Table
    R1: UCU, AGA. R2: GCC, GCC, R3: CTG, GAC
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  • Describe the process of protein synthesis that occurs in the cytoplasm
    At the ribosome the mRNA codons are matched with tRNA anticodons. This allows the tRNA to deposit the correct amino acid into the polypeptide.
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  • Describe the process of protein synthesis that occurs in the nucleus
    RNA polymerase binds to the template DNA strand and synthesises a complementary mRNA strand. Introns are spliced out to form the mature mRNA
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  • This is an image of?
    tRNA
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  • What direction is DNA read?
    5' to 3'
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  • What are the two most common shapes that make up the secondary structure?
    alpha-helix & beta-sheets
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  • Describe the induced fit model
    When substrates bind to the active site, the interactions between them cause the enzyme to slightly change shape producing a perfect fit
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  • How do increase reaction rate
    By lowering activation energy
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  • Describe how a competitive inhibitor lowers enzyme activity
    The inhibitor binds to the active site preventing the substrate from binding
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  • What is this enzymes optimum tempreature?
    40 degrees
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  • Explain the cause of the plateau in this enzyme catalysed reaction?
    All the enzymes are being used
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  • What effect does methylation have on gene expression
    lowers gene expression
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