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When researchers gave a genetic molecule the ability to replicate, it evolved over time into a complex network of “hosts” and “parasites” that both competed and cooperated to survive.
Was the addition of mitochondria a first step in the formation of complex cells or one of the last? A new study of bacteria tries to answer this contentious question in evolutionary biology.
Traits from RNA molecules passed between multiple generations of worms can work with genetic changes to influence future evolution.
Life could use a more expansive genetic code in theory, but new work shows that improving on three-letter codons would be a challenge.
With self-generated gradients of chemicals and physical tension, cells in the body steer themselves to vital destinations.
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