Question

What evidence does not back the claim that a chloroplast is an ancient bacterial photosynthesizing endosymbiont?

A. Chloroplasts can be affected by antibiotics, a class of drugs that target bacteria.
B.Chloroplasts have flagella and cilia and these structures are similar in shape and function to flagella and cilia found in bacteria.
C.Chloroplasts have their own genome, and the structure of their DNA is identical to that of bacterial DNA.
D.Chloroplasts replicate and divide through fission, the way bacteria divide.

Answer 1

Answer:

B. Chloroplasts have flagella and cilia and these structures are similar in shape and function to flagella and cilia found in bacteria.

Explanation:

The ENDOSYMBIOTIC THEORY is a theory that suggests the evolution of eukaryotic cells from prokaryotes. The theory explains that some organelles such as MITOCHONDRIA and CHLOROPLAST found in eukaryotic cells were once free-living prokaryotes. This theory was based on certain evidences that backed up the claim that chloroplasts were endosymbiont i.e a cell that lived in another cell. The evidences include:

- Chloroplasts have their own genome whose circular structure of DNA is identical to that of bacterial DNA.

- Chloroplasts replicate and divide through fission, the way bacteria divide

- Chloroplasts can be affected by antibiotics, a class of drugs that target bacteria.

However, among these evidences, the possession of flagella or cilia by chloroplasts is not included.