#Question id: 8781
#Unit 9. Diversity of Life Forms
The following question refers to this phylogenetic tree, depicting the origins of life and the three domains. Horizontal lines indicate instances of gene or genome transfer.
A possible phylogenetic tree for the three
domains of life.
Which of these processes can be included among those responsible for the horizontal components of the figure?
#Question id: 8782
#Unit 9. Diversity of Life Forms
A phylogenetic tree is shown for the three domains of life (Eukarya, Archaea, and Bacteria). The tree branches in two directions from the first point, labeled Common ancestor of all life. One branch leads in the direction of Eukarya and Archaea, and the other branch leads to Bacteria. The branch leading to Eukarya and Archaea divide, one branch leading to each domain. The branch leading to Eukarya divides into four branches. One leads to Euglenozoans, and the other three lead to branching points. The first leads to Forams in one direction, and another branching point in the other that leads to Diatoms and Ciliates. The second branching point leads to Red algae in one direction, and a branching point that leads to green algae and land plants in the other direction. The third branching point leads to amoebas in one direction, and a branching point that leads to fungi and animals in the other direction. Land plants, Fungi and Animals are all highlighted.
Cyanobacteria were once called blue-green algae because they are photosynthetic. According to the phylogeny shown, the cyanobacteria are more closely related to gram-positive bacteria than to ________.
#Question id: 8783
#Unit 9. Diversity of Life Forms
Which of the following statements is accurate, at least according to our present knowledge?
#Question id: 8787
#Unit 9. Diversity of Life Forms
Which of the following statements is accurate, at least according to our present knowledge?
#Question id: 8788
#Unit 9. Diversity of Life Forms
A phylogenetic tree is shown for the three
domains of life (Eukarya, Archaea, and Bacteria). The tree branches in two
directions from the first point, labeled Common ancestor of all life. One
branch leads in the direction of Eukarya and Archaea, and the other branch
leads to Bacteria. The branch leading to Eukarya and Archaea divide, one branch
leading to each domain. The branch leading to Eukarya divides into four
branches. One leads to Euglenozoans, and the other three lead to branching
points. The first leads to Forams in one direction, and another branching point
in the other that leads to Diatoms and Ciliates. The second branching point
leads to Red algae in one direction, and a branching point that leads to green
algae and land plants in the other direction. The third branching point leads
to amoebas in one direction, and a branching point that leads to fungi and
animals in the other direction. Land plants, Fungi and Animals are all
highlighted.
Examine the figure. If you were a graduate student trying to develop a thesis project that would resolve polytomies, which of the following groups would you study?
#Question id: 8789
#Unit 9. Diversity of Life Forms
If additional DNA sequence evidence shows that yeast genes for synthesizing proteins are more similar to protein-synthesizing genes in bacteria than those in archaea, a modern systematist would ________.