Examlex
The four basic chemical elements of DNA are identified by the letters:
Protocells
Simple, self-organized, prebiotic structures that are considered the precursors to living cells.
Eukaryotic Cells
Cells that contain a nucleus and other organelles enclosed within membranes, differentiating them from prokaryotic cells.
Prokaryotic Cells
Simple, single-celled organisms without a nucleus or other membrane-bound organelles, such as bacteria.
Invertebrates
Animals that lack a vertebral column or backbone, including groups such as insects, mollusks, and arachnids.
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