#Question id: 1253
#Unit 4. Cell Communication and Cell Signaling
Following statements are regarding to the wnt signalling.
A. Wnt proteins interact with several cell-surface proteins and activate multiple downstream signal transduction pathways. The principal signaling receptor for Wnt proteins is Frizzled (Fz), which contains seven transmembrane α helices.
B. The palmitate attached to the Wnt protein binds to a specific site on the Fz intracellular domain and stabilizes the Wnt-Fz complex.
C. “canonical” Wnt signaling pathway uses a second transmembrane protein, LRP, that associates with Frizzled in a Wnt signal– dependent manner.
D. In the resting state, two kinases in the complex, casein kinase 1 (CK1) and GSK3, sequentially phosphorylate β-catenin on multiple tyrosine residues.
Which of the following statements are correct?
#Question id: 10862
#Unit 10. Ecological Principles
The fundamental niche of a species is
#Question id: 4196
#Unit 3. Fundamental Processes
The role of EF-Tu in bacterial protein synthesis is
#Question id: 18663
#Unit 13. Methods in Biology
#Question id: 2442
#Unit 2. Cellular Organization
The drug colchicine acts to
a. promote microtubule assembly.
b. inhibit microtubule assembly.
c. sever microtubules.
d. block cell division.
e. cap microtubule ends.