Question

question 20 multiple choice worth 3 points (02 03a hc) some modern eukaryotes, such as giardia intestinalis, lack mitochondria, but still retain some of the genes for mitochondrial proteins. what logical conclusion can be drawn about these organisms? o some time ago, these organisms exchanged genes another cell containing mitochondria. o during their evolution, these organisms also lost their ability to produce their own energy. o based on a mutation during their evolution, these organisms are now unable to survive without a host cell. o at one point during their evolution, these organisms contained mitochondria. question 21 multiple choice worth 2 points (02 02 lc)

Explanation:

The organisms in question are eukaryotes that lack mitochondria but have mitochondrial - related genes. This suggests that they once had mitochondria. Over time, during evolution, they may have lost their mitochondria but retained some of the associated genes. Gene exchange can occur in evolution. Losing the ability to produce their own energy is a consequence of losing mitochondria. And being unable to survive without a host cell is also a likely outcome. However, the most fundamental and initial condition is that they once contained mitochondria.

Answer:

A. At one point during their evolution, these organisms contained mitochondria.