Question

Many researchers think that the first eukaryotic cells obtained energy for life-sustaining functions from organic compounds. Given this information, which of the following organelles most likely appeared last in eukaryotic cells? a. plasma membrane b. chloroplast c. ribosome d. nucleus

Answer 1

Answer:

b. chloroplast

Explanation:

Chloroplasts are the double membrane-bound organelles that serve as the site for photosynthesis in eukaryotes. Chloroplasts are the organelles where eukaryotic autotrophs synthesize the organic nutrients by the process of photosynthesis. According to the given information, the first eukaryotic cells were heterotrophs as they derived energy by available organic compounds. They did not synthesize the organic nutrients to use them as fuel. Chloroplasts are not present in heterotrophic organisms such as animals. Therefore, chloroplasts are most likely to have appeared last in the eukaryotic cells.

Answer 2

Answer:

The correct answer is b. chloroplast

Explanation:

Endosymbiotic theory says that eukaryotes are evolved from prokaryotes when a bigger prokaryotic cell engulfed a smaller prokaryotic cell. Then these two cells lived with each other in a symbiotic relationship and during its evolution, it evolved into eukaryotic cells.

As chloroplast use inorganic compounds like CO2 and H20 for the formation of organic molecules like glucose which give energy to eukaryotic cell for like sustaining function, therefore, chloroplast would be the organelle that would most likely to be appeared last in eukaryotic cell.  

So the correct answer is b. chloroplast