#Question id: 1062
#Unit 4. Cell Communication and Cell Signaling
Using phages to treat a bacterial infection is an interesting idea because
#Question id: 8291
#Unit 9. Diversity of Life Forms
Which of the following pairs are the best examples of homologous structures?
#Question id: 10196
#Unit 6. System Physiology – Plant
Why are light compensation points lower for shade plants?
#Question id: 5680
#Unit 5. Developmental Biology
In vitro model of species-specific binding shows in figure. Add the bindin particles to a plastic well containing a suspension of eggs. After 2–5 minutes of gentle shaking, the wells were photographed.
According to this figure, which of the following conclusion correctly define the phenomenon of species specificity?
#Question id: 1255
#Unit 4. Cell Communication and Cell Signaling
Following statements are regarding to the mechanism of action of cholera toxin.
A. cholera toxin is a homodimeric protein, target G proteins, interfering with normal signaling in host cells.
B. cholera toxin associates with a small G protein, known as ARF6.
C. association with ARF6 activates cholera toxin, which catalyzes the transfer of ADP-ribose from NAD+ to the critical Arg residue in the P loop of the alpha subunit of Gs.
D. ADP-ribosylation blocks the GEF activity of Gs and thereby renders Gs permanently inactive.
E. This results in continuous activation of the adenylyl cyclase of intestinal epithelial cells, chronically high cAMP, and active PKA dephosphorylates the CFTR Cl- channel and a sodium-proton exchanger in the intestinal epithelial cells.
Which of the following combination is correct?