#Question id: 5009
#Unit 11. Evolution and Behavior
A genetic change that caused a certain Hox gene to be expressed along the tip of a vertebrate limb bud instead of farther back helped to make possible the evolution of the tetrapod limb. This type of change is illustrative of
#Question id: 10880
#Unit 10. Ecological Principles
Which marine zone would have the lowest rates of primary productivity (photosynthesis)?
#Question id: 1149
#Unit 4. Cell Communication and Cell Signaling
1,2-diacylglycerol (DAG) and inositol 1,4,5-trisphosphate (IP3) are cleaved from phosphatidylinositol 4,5-bisphosphate (PIP2) by the enzyme:
#Question id: 3698
#Unit 3. Fundamental Processes
In this diagram of the process of DNA replication at a replication fork, the strand labeled B is the:
#Question id: 6963
#Unit 5. Developmental Biology
During early sea urchin development, which embryonic cells have similar organizer activity to that of amphibian Spemann organizer?