Question

in the evolution of eukaryotic cells, the endosymbiosis of a —— is thought to have given rise to mitochondria, and later, the endosymbiosis of a —— bacterium is thought to have given rise to chloroplasts. o photosynthetic; proteobacterium o methanogenic; cyanobacterium o cyanobacterium; methanogenic o proteobacterium; photosynthetic

Explanation:

The endosymbiotic theory posits that mitochondria originated from the endosymbiosis of a proteobacterium, and chloroplasts from the endosymbiosis of a cyanobacterium. Methanogenic bacteria are not involved in the formation of mitochondria or chloroplasts.

Answer:

A. proteobacterium; photosynthetic, cyanobacterium; methanogenic
B. cyanobacterium; methanogenic
C. methanogenic; cyanobacterium
D. photosynthetic; proteobacterium

The correct answer is: A. proteobacterium; photosynthetic, cyanobacterium; methanogenic