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Biology 3rd midterm

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    1. DNA Replication a) Definition of the process b) Semi-conservative nature c) Direction of synthesis (5’→3’) d) Base complementarity e) Enzymes involved (helicase, DNA polymerase,
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  • What is DNA replication?
    The process of making an identical copy of DNA.
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  • Why is DNA replication semi-conservative?
    Each new molecule keeps one old strand and one new strand.
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  • What is the direction of DNA synthesis?
    5’ to 3’.
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  • The purpose of the translation process is:
    Copy the DNA information into an mRNA molecule.
    Synthesize proteins from the information contained in mRNA
    Replicate genetic material before cell division.
    To form an RNA molecule complementary to DNA.
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  • Which enzyme adds nucleotides during replication?
    DNA polymerase.
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  • Which enzyme joins Okazaki fragments?
    Ligase.
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  • Transcription is the process by which:
    An mRNA molecule is formed using a DNA strand as a template..
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  • What is base complementarity in DNA?
    A pairs with T, C pairs with G.
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  • What is the product of transcription?
    mRNA.
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  • What molecule is the template for transcription?
    DNA template strand.
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  • Where does translation occur?
    Cytoplasm and Ribosomes.
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  • What is the role of mRNA?
    It carries the genetic code from DNA.
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  • What is the role of tRNA?
    It brings amino acids to the ribosome.
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  • What is the role of ribosomes?
    They read codons and assemble proteins.
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  • What is a codon?
    A three-base sequence on mRNA.
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  • What are the characteristics of the genetic code?
    Universal and degenerate.
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