#Question id: 3879
#Unit 3. Fundamental Processes
Which of the following is not usually essential for the catalytic activity of ribozymes?
#Question id: 1138
#Unit 4. Cell Communication and Cell Signaling
A loss-of-function mutation in Wnt would have a phenotype similar to a
a. gain-of-function mutation in GSK-3.
b. gain-of-function mutation in β-catenin.
c. loss-of-function mutation in GSK-3.
d. loss-of-function mutation in β-catenin.
#Question id: 12955
#Unit 7. System Physiology – Animal
#Question id: 12793
#Unit 10. Ecological Principles
#Question id: 28215
#Unit 5. Developmental Biology
In the frog (Xenopus laevis) a gradient of the paracrine factor activin, which of the following observation is correct at the lower concentrations of activin ?