Chloroplasts and mitochondria are thought to be of prokaryotic origin. One piece of evidence that supports this hypothesis is that these organelles contain prokaryotic-like ribosomes. These ribosomes are probably most similar to Ribosomes found. A) Free in the cytoplasm of eukaryotesB) On the rough ERC) In bacterial cellsD) The first two answers are correctD) The first three answers are correct

The correct answer is C) In bacterial cells

Explanation:

Chloroplast and mitochondria are thought to be originated from endosymbiosis. According to endosymbiotic theory, an ancestral cell engulfed an aerobic prokaryotic cell that developed into chloroplast. Mitochondria is also produced by endosymbiosis of a prokaryotic cell.

This theory is proved by several evidence like chloroplast and mitochondria have similar ribosomes that are found in prokaryotes i.e 70s ribosomes. So ribosomes of this organelle are probably most similar to Ribosomes found in the bacterial cells.

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.