Origin Of Life Post-assessment (Grade 7)

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Origin of Life Post-Assessment (Grade 7)


Questions and Answers
  • 1. 

    The Miller-Urey experiment in which water, gases, heat and electricity formed amino acids demonstrates the following (Standard 3.1j):

    • A.

      It demonstrated that RNA was the first genetic coding system in early Earth

    • B.

      It supported the theory of biogenesis

    • C.

      It was proven that spontaneous generation is possible

    • D.

      It is possible for organic molecules to form from inorganic molecules

    • E.

      It is possible for inorganic molecules to form from organic molecules

    Correct Answer
    D. It is possible for organic molecules to form from inorganic molecules
    Explanation
    The Miller-Urey experiment demonstrated that organic molecules, specifically amino acids, can be formed from inorganic molecules under conditions simulating early Earth. This supports the idea that life on Earth could have originated from non-living matter through a process called abiogenesis or biogenesis. It does not provide evidence for RNA being the first genetic coding system, the possibility of spontaneous generation, or the formation of inorganic molecules from organic molecules.

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  • 2. 

    According to Dr. Niles Eldridge, what is unique about the “sixth extinction” (Standard 3.1j)?

    • A.

      The Sixth Extinction seems to be the first recorded global extinction event that is an abiotic cause.

    • B.

      The Sixth Extinction seems to be the first recorded global extinction event that is a biotic cause.

    • C.

      The Sixth Extinction is caused by global climate change

    • D.

      The Sixth Extinction seems to be the first recorded global extinction caused by meteor impact.

    • E.

      The Sixth Extinction seems to be the first recorded global extinction event that is not causes by humans.

    Correct Answer
    B. The Sixth Extinction seems to be the first recorded global extinction event that is a biotic cause.
    Explanation
    The correct answer suggests that the unique aspect of the "sixth extinction" is that it is the first recorded global extinction event that is caused by a biotic factor. This means that the extinction is caused by living organisms or interactions between living organisms, rather than being caused by abiotic factors such as climate change or meteor impacts. This distinction sets the sixth extinction apart from previous extinction events and highlights the role of living organisms in driving this particular extinction event.

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  • 3. 

    Banded iron formations are important evidence for which idea in the early evolution of life (Standard 3.1j)?

    • A.

      Chemotrophic autotrophs

    • B.

      Endosymbiotic organelles

    • C.

      Heterotrophic prokaryotes

    • D.

      Heterotrophic eukaryotes

    • E.

      Photosynthetic autotrophs

    Correct Answer
    E. Photosynthetic autotrophs
    Explanation
    Banded iron formations are important evidence for the idea of photosynthetic autotrophs in the early evolution of life. Banded iron formations are sedimentary rocks that contain alternating layers of iron-rich minerals and chert. They were formed when photosynthetic autotrophs, such as cyanobacteria, released oxygen as a byproduct of photosynthesis. This oxygen reacted with iron dissolved in the oceans, causing it to precipitate and form the banded iron formations. Therefore, the presence of banded iron formations suggests the existence of photosynthetic autotrophs in the early Earth.

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  • 4. 

    Which of the following is the best argument that RNA may have preceded DNA (Standard 3.1j)?

    • A.

      Enzymes are used during DNA replication.

    • B.

      Hydrogen cyanide can react with itself to eventually form adenine.

    • C.

      All DNA-based life forms contain RNA.

    • D.

      DNA is made up of nucleotides.

    • E.

      RNA is made of ribose and DNA is made of deoxyribose.

    Correct Answer
    C. All DNA-based life forms contain RNA.
    Explanation
    All DNA-based life forms contain RNA, which suggests that RNA may have preceded DNA. This is because RNA is involved in various essential processes in living organisms, such as protein synthesis and gene regulation. The presence of RNA in all DNA-based life forms indicates that RNA likely played a crucial role in early life forms and may have been the precursor to DNA.

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  • 5. 

    Carbon-14 has a half-life of 5,730 years.  What is the age of a fossil that has 1/8 of the original sample of Carbon-14 remaining (Standard 3.1a)?

    • A.

      5,730 Years Old

    • B.

      11,460 Years Old

    • C.

      17,190 Years Old

    • D.

      716.25 Years Old

    • E.

      5.7 Million Years Old

    Correct Answer
    C. 17,190 Years Old
    Explanation
    The half-life of Carbon-14 is 5,730 years, which means that after 5,730 years, half of the original sample will remain. In this case, the fossil has 1/8 of the original sample remaining. Since 1/8 is equal to (1/2)^3, we can determine that three half-lives have passed. Therefore, the age of the fossil can be calculated by multiplying the half-life (5,730 years) by the number of half-lives (3), resulting in 17,190 years old.

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  • 6. 

    Rate, on a scale of 1 – 4, 1 being the lowest and 4 being the highest, how much do you already know about the origin of life on Earth?

    Correct Answer
    1
    2
    3
    4
    Explanation
    The answer to this question is 1,2,3,4 because it allows the respondent to rate their level of knowledge about the origin of life on Earth on a scale from 1 to 4. This question provides a range of options for the respondent to choose from, indicating that they can have varying levels of knowledge on the topic.

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  • 7. 

    Rate, on a scale of 1 – 4, 1 being the lowest and 4 being the highest, how interested are you in the origin of life on Earth?

    Correct Answer
    1
    2
    3
    4
    Explanation
    This question asks the respondent to rate their interest in the origin of life on Earth on a scale of 1 to 4. The answer options provided are 1, 2, 3, and 4, indicating the level of interest from lowest to highest.

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  • 8. 

    Which of the following statements is true about eukaryotic cells? (Standard 3.1g, 3.1j)

    • A.

      Eukaryotic cells have no membrane-covered organelles.

    • B.

      Eukaryotic cells are comprised solely of circular DNA.

    • C.

      Eukaryotic cells do not have a nucleus.

    • D.

      Eukaryotic cells have a nucleus.

    • E.

      Statements a, b, and c are true about eukaryotic cells.

    Correct Answer
    D. Eukaryotic cells have a nucleus.
    Explanation
    Eukaryotic cells have a nucleus. This is true because eukaryotic cells are characterized by the presence of a distinct nucleus, which contains the cell's genetic material. The nucleus is surrounded by a nuclear membrane, which separates it from the rest of the cell. This membrane-bound nucleus is one of the defining features of eukaryotic cells and distinguishes them from prokaryotic cells, which lack a nucleus.

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  • 9. 

    What are the three eras of the Phanerozoic Eon listed in chronological order (Standard 3.1 a, 3.1j)?

    • A.

      Pre-Cambrian, Cambrian Explosion, K-T Boundary

    • B.

      Eon, Era, Period

    • C.

      Paleozoic, Cenozoic, Mesozoic

    • D.

      Mesozoic, Paleozoic, Cenozoic

    • E.

      Paleozoic, Mesozoic, Cenozoic

    Correct Answer
    E. Paleozoic, Mesozoic, Cenozoic
    Explanation
    The Phanerozoic Eon is divided into three eras: Paleozoic, Mesozoic, and Cenozoic. These eras are listed in chronological order, with the Paleozoic era being the oldest, followed by the Mesozoic era, and finally the Cenozoic era.

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  • 10. 

    The theory that states that only living organisms can produce other living organisms (Standards 3.1 a, 4.1a) is:

    • A.

      Theory of spontaneous generation

    • B.

      Primordial soup theory

    • C.

      RNA World theory

    • D.

      Theory of biogenesis

    • E.

      Endosymbiont theory

    Correct Answer
    D. Theory of biogenesis
    Explanation
    The theory of biogenesis states that living organisms can only arise from pre-existing living organisms. This theory opposes the idea of spontaneous generation, which suggests that living organisms can arise from non-living matter. The theory of biogenesis is supported by scientific evidence and observations, such as the reproduction and growth of organisms through cell division or sexual reproduction. It is a fundamental principle in biology and is widely accepted in the scientific community.

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  • 11. 

    During the Paleozoic Era, the rapid diversification of most marine animal groups in the space of just a few million years (Standards 3.1a, 3.1j) is known as the:

    • A.

      Precambrian Explosion

    • B.

      K-T Boundary

    • C.

      Permian Mass Extinction

    • D.

      Miller-Urey Experiment

    • E.

      Cambrian Explosion

    Correct Answer
    E. Cambrian Explosion
    Explanation
    The correct answer is the Cambrian Explosion. During the Paleozoic Era, there was a sudden and rapid diversification of marine animal groups, known as the Cambrian Explosion. This event occurred over a relatively short period of time, only a few million years, and resulted in the emergence of a wide variety of complex and diverse organisms. The Cambrian Explosion is considered a significant event in the history of life on Earth, as it marked the appearance of many major animal groups that still exist today.

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  • 12. 

    One example of evidence that supports the endosymbiont theory (Standards 1.3 a, 3.1a, 3.1j) is:

    • A.

      Chloroplasts and mitochondria have a double membrane

    • B.

      Miller and Urey demonstrated that inorganic molecules can form from organic molecules

    • C.

      All prokaryotes have a nucleus and linear DNA

    • D.

      Some protists have animal-like and plant-like characteristics

    • E.

      Chemosynthetic bacteria have the ability to produce food using sulfur dioxide

    Correct Answer
    A. Chloroplasts and mitochondria have a double membrane
    Explanation
    The presence of a double membrane in both chloroplasts and mitochondria supports the endosymbiont theory. According to this theory, these organelles were once free-living bacteria that were engulfed by a host cell. The double membrane is believed to have originated from the host cell's plasma membrane and the engulfed bacteria's own membrane. This evidence suggests a symbiotic relationship between the host cell and the engulfed bacteria, supporting the idea that chloroplasts and mitochondria were once independent organisms that became incorporated into eukaryotic cells.

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  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
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    Tagscience
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