A Researcher Discovers a New Microfossil

question 131

Multiple Choice

A researcher discovers a new microfossil. At first, he is uncertain whether this organism was a bacterium, archaeon, or protist. After careful study, he determines that this organism was a protist. What features were present in this microfossil that lead the researcher to this conclusion?

• A)DNA survived in this microfossil over the millennia; its DNA sequence was likely similar to those present in certain modern-day protists.
• B)This microfossil was of an organism that had a distinct endomembrane system (i.e., nuclear membrane, endoplasmic reticulum, etc.).
• C)The microfossil contained evidence of mitochondria and/or chloroplasts.
• D)This microfossil contained morphologically complex cell walls.
• E)All of these choices are correct.

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