According to genetic evidence, two main lines of descent emerged from the last universal common ancestor. One of these lines gave rise to the
A.
B.
C.
D.
Correct. See Key Concept 25.1 Bacteria and Archaea Are the Two Primary Divisions of Life
Incorrect. See Key Concept 25.1 Bacteria and Archaea Are the Two Primary Divisions of Life
Animation 25.1 Quiz
Why were ribosomal RNA molecules (rRNA) so important in showing the relationships between organisms in the three domains?
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B.
C.
D.
Correct. See Key Concept 25.1 Bacteria and Archaea Are the Two Primary Divisions of Life
Incorrect. See Key Concept 25.1 Bacteria and Archaea Are the Two Primary Divisions of Life
Animation 25.1 Quiz
Refer to the figure below.
Morphologically, archaea differ from bacteria because they lack peptidoglycan molecules in their cell walls. Archaea differ from eukarya because they lack a membrane-bound nucleus. What can be concluded about when these two features evolved along the phylogenetic tree shown in the figure?
A.
B.
C.
D.
Correct. See Key Concept 25.1 Bacteria and Archaea Are the Two Primary Divisions of Life
Incorrect. See Key Concept 25.1 Bacteria and Archaea Are the Two Primary Divisions of Life
Animation 25.1 Quiz
Refer to the table below.
Genomes of three different organisms were sequenced. Each organism represents one of the three domains of life as indicated in the top row of the table. A comparison of the genomes revealed some regions of overlap between the organisms. Three regions, labeled 1 through 3 in the table, show overlap between at least two organisms as indicated by checkmarks. Of the three cases shown, which is/are most likely due to lateral gene transfer?
A.
B.
C.
D.
Correct. See Key Concept 25.1 Bacteria and Archaea Are the Two Primary Divisions of Life
Incorrect. See Key Concept 25.1 Bacteria and Archaea Are the Two Primary Divisions of Life