The endosymbiont theory is supported by the following evidence except:
A)Mitochondria are surrounded by two membranes.
B)Mitochondrial ribosomes are similar to bacterial ribosomes.
C)Mitochondria contain circular molecules of DNA.
D)Mitochondria divide by binary fission.
E)Mitochondria have a matrix.

Question

Quizplus · Accepted Answer

The presence of a matrix in mitochondria is not evidence supporting the endosymbiont theory. The endosymbiont theory is supported by evidence that highlights similarities between mitochondria (and chloroplasts) and bacteria, such as double membranes, bacterial-like ribosomes, circular DNA, and binary fission. The matrix is an internal structure of mitochondria where the Krebs cycle takes place, but it does not directly support the theory that mitochondria originated from engulfed prokaryotic cells.

The Endosymbiont Theory Is Supported by the Following Evidence Except