Question

multiple choice question
the hydrogen hypothesis suggests that during endosymbiosis ______.

○ mitochondria and chloroplasts arose from a common source
○ the endosymbiont became dependent on hydrogen produced by the host
○ an environment rich in hydrogen was necessary for chloroplast development
○ the host cell became dependent on endosymbiont - produced hydrogen for energy

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Explanation:

The hydrogen hypothesis for endosymbiosis proposes that the host anaerobic cell relied on hydrogen produced by the ingested endosymbiont (the precursor to mitochondria) as an energy source, leading to the stable symbiotic relationship that evolved into modern eukaryotic cells with mitochondria. The other options do not align with the core tenets of this specific hypothesis.

Answer:

the host cell became dependent on endosymbiont-produced hydrogen for energy