Question

Which feature of mitochondria and chloroplasts provide evidence for their endosymbiotic origins?1. Mitochondria and chloroplasts are bounded by membranes.2. Mitochondria and chloroplasts have the ability to live outside of a cell.3. Mitochondria and chloroplasts have their own DNA.4. Mitochondria and chloroplasts both have a nucleolus.5. Mitochondria and chloroplasts contain cytoplasm.

Answer 1

Mitochondria and chloroplasts having their own DNA, ribosomes similar to those found in bacteria, and a double membrane structure provides evidence for their endosymbiotic origins.

Step-by-step explanation:

The feature of mitochondria and chloroplasts that provides evidence for their endosymbiotic origins is that they both have their own DNA. This is significant because their DNA is similar to that of prokaryotic cells, specifically bacteria. Additionally, the presence of ribosomes within these organelles that resemble bacterial ribosomes, and the method of replication through binary fission which is similar to bacteria, provides further evidence of an endosymbiotic origin. The double-membrane structure of these organelles is also indicative of an endosymbiotic event, with the theory being that one membrane comes from the engulfed bacteria and the second from the host eukaryotic cell.

Answer 2

Numerous lines of evidence exist, including that mitochondria and chloroplasts have their own circular DNA (prokaryotes also have circular DNA), mitochondria and chloroplasts have a double membrane (the inner membrane would have initially been the ingested prokaryote's single membrane, and the outer membrane.

Answer: 3