166k views
5 votes
It's been apotheosized that chloroplasts originated from photosynthetic cyanobacteria that became symbiotic inside a host cell. Which of the following observations provides strongest evidence for this suggestion?

a. Chloroplast DNA shows similarities to cyanobacterial DNA
b. Genetic Information to build specific protein Molecules
c. Ventricular contractions/ventricular relaxation
d. Keratin

User Steyn
by
8.2k points

1 Answer

0 votes

Final answer:

The most compelling evidence for the origin of chloroplasts from photosynthetic cyanobacteria becoming symbiotic inside a host cell is the similarities between chloroplast DNA and cyanobacterial DNA.

Step-by-step explanation:

The strongest evidence supporting the suggestion that chloroplasts originated from photosynthetic cyanobacteria becoming symbiotic inside a host cell is that chloroplast DNA shows similarities to cyanobacterial DNA. Scientists have found that the DNA sequences and chromosome structures of chloroplasts are highly related to those of cyanobacteria. This supports the idea that chloroplasts were once free-living cyanobacteria that were engulfed by eukaryotic cells and established an endosymbiotic relationship.

User ALW
by
8.1k points