#Question id: 12043
#Unit 7. System Physiology – Animal
#Question id: 4631
#Unit 11. Evolution and Behavior
As a young biologist, Charles Darwin had expected the living plants of temperate South America would resemble those of temperate Europe, but he was surprised to find that they more closely resembled the plants of tropical South America. The biological explanation for this observation is most properly associated with the field of
#Question id: 8707
#Unit 9. Diversity of Life Forms
Use the figure to answer the following question
The phylogenetic tree shown ________.
#Question id: 5144
#Unit 5. Developmental Biology
Following statements regarding to noncanonical wnt pathways.
A. The planar cell polarity, or PCP, pathway functions to regulate the actin and microtubule cytoskeleton, thus influencing cell shape, and often results in bipolar protrusive behaviors necessary for a cell to migrate.
B. Wnts (such as Wnt5a and Wnt11) can activate Disheveled by binding to a different receptor (Frizzled paired with Ror instead of Lrp5), and this Ror receptor complex phosphorylates Disheveled in a way that allows it to interact with Rho GTPases.
C. Wnt/PCP signaling through cytoskeleton control can direct cells to divide in the different plane ( forming upper and lower tissue compartments) and to move within that different plane.
D. the Wnt/calcium pathway leads to the release of calcium stored within cells, and this released calcium acts as an important secondary messenger to activates a phospholipase (PLC) whose enzyme activities release a compound that in turn releases calcium ions from the cytosol.
Which of the following is incorrect?
#Question id: 7176
#Unit 5. Developmental Biology
The
metamorphic changes of frog development are brought about by following events.
(A)
the secretion of the hormone thyroxine (T4) into the blood by the thyroid gland
(B)
the degradation of T3 in the target tissues
(C)
the conversion of (T4) into the more active hormone, triiodothyronine (T3) by
the target tissues
Which of the following series is correct?