What is Endosymbiont theory in Biology? PDF Book

Learn Endosymbiont theory definition in biology with explanation to study “What is Endosymbiont theory”. Study endosymbiont theory explanation with biology terms to review biology course for online degree programs.

Endosymbiont theory Definition

  • Endosymbiont theory states that an early ancestor of eukaryotic cells engulfed an oxygen-using nonphotosynthetic prokaryotic cell.

    Campbell Biology by J.B. Reece, L.A. Urry, M.L. Cain, S.A. Wasserman, P.V. Minorsky, R.B. Jackson

Endosymbiont theory Explanation

This theory basically describes how a large host cell and ingested bacteria could easily become dependent on one another and form a symbiotic relationship. They depend on each other for survival. It is believed that mitochondria and chloroplasts also became part of the eukaryotic cells by this manner.

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