1(Of protozoans, certain algae and spores, etc.) consisting of a single cell.
- An interesting variant of normal photosynthesis is the simultaneous photoevolution of molecular hydrogen and oxygen by certain unicellular algae and in vitro cell-free preparations.
- However, the evolutionary distance between unicellular organisms and higher plants might be a serious setback when trying to obtain high expression, at the right time and cellular localization, of foreign genes in plants.
- As compared to metazoans, the development of these unicellular organisms is likely less affected by dissociated heterochrony, which is considered a common phenomenon in metazoans.
1.1(Of an evolutionary or developmental stage) characterized by the formation or presence of a single cell or cells.
- All further cell divisions from this unicellular stage of the human being occur by simple mitosis.
- Second, the existence of unicellular life for one or two billion years without the formation of multicellular life wouldn't be a problem on Mars because it obviously was not a problem on Earth.
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