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    4.

    Artificial synthesis of ATP, porphyrin and nucleotides was detained by

    A

    Abundance of inorganic precursors in the environment

    B

    Lack of knowledge about the structure of biomolecules and the pathways for their synthesis

    C

    Presence of oxygen in the early Earth's atmosphere

    D

    Easy availability of energy sources like UV radiation and lightning

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    8.

    The first life on earth consists of

    A

    Single-celled prokaryotes (bacteria and archaea)

    B

    Multicellular eukaryotes (plants and animals)

    C

    Viruses

    D

    Complex proteins

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    10.

    According to the current understanding of abiogenesis, which of the following represents the likely order of events leading to the first cells?

    A

    Polymerization β†’ Synthesis of monomers β†’ Protobiont formation β†’ DNA-based genetic systems

    B

    Synthesis of monomers β†’ Polymerization β†’ Protobiont formation β†’ DNA-based genetic systems

    C

    Protobiont formation β†’ Synthesis of monomers β†’ Polymerization β†’ DNA-based genetic systems

    D

    DNA-based genetic systems β†’ Protobiont formation β†’ Polymerization β†’ Synthesis of monomers

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