Question

how do ribosomes demonstrate a prokaryotic origin for mitochondria and chloroplasts? they make amino acids for the whole cell. they have the ability to leave the cell. they retained the machinery for protein synthesis.

Explanation:

To determine the correct answer, we analyze each option:

• Option 1: Ribosomes do not make amino acids; they synthesize proteins from amino acids. So this is incorrect.
• Option 2: Ribosomes are not known for leaving the cell, and this is not related to their prokaryotic origin evidence. Incorrect.
• Option 3: Mitochondria and chloroplasts have ribosomes (similar to prokaryotic ribosomes) that retain protein - synthesis machinery. This supports the endosymbiotic theory (prokaryotic origin) as prokaryotes use ribosomes for protein synthesis, and these organelles inherited this machinery. Correct.

Answer:

The correct option is: They retained the machinery for protein synthesis.