Which statement is correct with regard to the comparison of secondary endosymbiosis to primary endosymbiosis?
A)In secondary endosymbiosis,an entire free-living alga is ingested into the food vacuole of a heterotrophic eukaryote.
B)In secondary endosymbiosis,an entire free-living alga is incorporated into the mitochondrion a heterotrophic eukaryote.
C)Primary endosymbiosis is the result of alga being engulfed by a cyanobacterium.
D)Primary and secondary endosymbiosis are essential equivalent but occurred at different points in time in the evolution of life.

Question

Quizplus · Accepted Answer

In secondary endosymbiosis, an entire free-living alga is ingested into the food vacuole of a heterotrophic eukaryote, whereas in primary endosymbiosis, a free-living bacterium (most likely a cyanobacterium) is engulfed by a eukaryotic host. Option B is incorrect because mitochondria are the result of primary endosymbiosis, not secondary endosymbiosis, whereas option C is only partially correct because primary endosymbiosis does not involve an alga being engulfed by a cyanobacterium. Option D is incorrect because primary and secondary endosymbiosis are not equivalent; rather, secondary endosymbiosis is a consequence of primary endosymbiosis.

Which Statement Is Correct with Regard to the Comparison of Secondary