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

need help? review these concept resources.
read about the concept

Explanation:

The hydrogen hypothesis focuses on the origin of mitochondria: it proposes that the host (an archaeon) relied on hydrogen produced by the endosymbiont (a bacterium) as an energy source, leading to the endosymbiotic relationship that evolved into mitochondria. The other options do not align with the core claims of this hypothesis.

Answer:

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