Examlex
All of the following characteristics are usually taken to be sufficient to rule out the existence of life on an extrasolar planet EXCEPT ONE.Which is the exception?
Internal Membrane
A membrane within a cell that divides the cell into different compartments or organelles.
Eukaryotic Cell Fossil
Preserved remnants of ancient eukaryotic cells, which possess membrane-bound organelles, including a nucleus.
Biomarker
A biological molecule found in blood, other body fluids, or tissues that is a sign of a normal or abnormal process, or of a condition or disease.
Steroids
Organic compounds with a characteristic molecular structure containing four rings of carbon atoms; includes some hormones and vitamins.
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