Bacterial cells and human cells share many similar features.Which feature can be used as support for the claim that humans and bacteria have a common origin?
A) Both extract energy from their environment.
B) Both undergo cell division.
C) Both use chemical reactions to maintain the living state.
D) They contain proteins with similar compositions.
E) They have similar percentages of water.

Question

Quizplus · Accepted Answer

Proteins are complex molecules made up of amino acids, and the similarities in protein composition between bacterial cells and human cells provide evidence that they may have a common ancestor. In fact, all living organisms use the same basic set of amino acids to build their proteins, which suggests that life on Earth evolved from a common ancestor. While options A, B, C, and E are all features shared by bacterial cells and human cells, they are not specific enough to support the claim that they have a common origin.

Bacterial Cells and Human Cells Share Many Similar Features