#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: 141
#Unit 1. Molecules and their Interaction Relevant to Biology
At the isoelectric pH of an amino acid which has two pKa values the net charge is
#Question id: 1451
#Unit 4. Cell Communication and Cell Signaling
Burkitt’s lymphoma results from the overproduction of:
#Question id: 12484
#Unit 2. Cellular Organization
Column I |
Column II |
A. APC/CCdc20 |
i . responsible
for ubiquitinating proteins, such as mitotic cyclins |
B. APC/CCdh1 |
ii. responsible
for destroying proteins, such as securin |
|
iii. promotes
the metaphase–anaphase transition |
|
iv. Promotes
exit from mitosis |
#Question id: 403
#Unit 1. Molecules and their Interaction Relevant to Biology
For the reaction A -> B, DG'° = –60 kJ/mol. The reaction is started with 10 mmol of A; no B is initially present. After 24 hours, analysis reveals the presence of 2 mmol of B, 8 mmol of A. Which is the most likely explanation?