Early History of Life on Earth
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Questions and Answers

What is a characteristic of prokaryotic genomic DNA?

  • It is diploid
  • It is haploid (correct)
  • It is linear
  • It has a centromere
  • What is the term for the process by which genes are transferred from one bacterium to another through viral infection?

  • Conjugation
  • Transcription
  • Transformation
  • Transduction (correct)
  • What is the source of energy for photoautotrophs?

  • Light (correct)
  • Chemical reactions
  • Organic compounds
  • Inorganic compounds
  • What was a major consequence of the oxygen revolution 2.5 billion years ago?

    <p>The increased O2 levels</p> Signup and view all the answers

    What was the approximate time when Earth formed?

    <p>4.5 billion years ago</p> Signup and view all the answers

    What is the term for the process by which bacteria exchange genetic material through direct cell-to-cell contact?

    <p>Conjugation</p> Signup and view all the answers

    What is a characteristic of prokaryotic ribosomes?

    <p>They are the site of protein synthesis</p> Signup and view all the answers

    What was the primary reason for the initial low oxygen levels on Earth?

    <p>Absence of photosynthesis</p> Signup and view all the answers

    What is the term for the alternating layers of red and dark rock formed as a result of oxygen reacting with iron?

    <p>Banded iron formation</p> Signup and view all the answers

    What was the primary source of energy for ATP synthesis in early life forms?

    <p>Oxidation reactions</p> Signup and view all the answers

    What is the approximate time when cyanobacteria are thought to have formed?

    <p>2.8 billion years ago</p> Signup and view all the answers

    What is the term for the classification system that unites bacteria and archaea based on primitive similarities?

    <p>Domain classification</p> Signup and view all the answers

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