#Question id: 1096
#Unit 4. Cell Communication and Cell Signaling
Which of the following processes generally requires protein phosphorylation?
#Question id: 19286
#Unit 9. Diversity of Life Forms
#Question id: 3829
#Unit 3. Fundamental Processes
Why is only one copy of DNA made per cell division cycle in eukaryotes despite the presence of multiple origins of replication?
#Question id: 3885
#Unit 3. Fundamental Processes
AZT (3'-azido-2',3'-dideoxythymidine), used to treat HIV infection, acts in HIV-infected cells by:
#Question id: 7173
#Unit 5. Developmental Biology
Normally, the FgfR3 protein (a receptor tyrosine kinase) is activated by a fibroblast growth factor and signals the chondrocytes to stop dividing and begin differentiating into cartilage. This signal is mediated by the Stat protein, which is phosphorylated by activated FgfR3 and then translocated into the nucleus. Inside the nucleus, Stat activates the genes encoding a cell cycle inhibitor, the p21 protein. The mutation in FgfR3 causes the lethal condition thanatophoric dysplasia. This condition may be achieved by:
A. Mutations in the extracellular domain of the FgfR3 protein
B. Mutations in the tyrosine kinase intracellular domain of the FgfR3 protein
C. Mutations in the transmembrane domain of the FgfR3 protein
Which of the following is correct?