Becker's World of the Cell (9th Edition)
Becker's World of the Cell (9th Edition)
9th Edition
ISBN: 9780321934925
Author: Jeff Hardin, Gregory Paul Bertoni
Publisher: PEARSON
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Chapter 24, Problem 24.4CC

Both EGF (a mitogen) and TGFβ (when acting as an inhibitor) affect Cdk-cyclin complex function. Compare and contrast the ways in which EGF and TGFβ operate. What would happen if a cell were exposed to both at the same time?

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TGF-B Receptor I (RI) phosphorylation of Smad2/3 does all of the following EXCEPT: activate Smad2/3 binding to the Co-Smad Smad4 dissociate intramolecular binding of Smad2/3 MH1 and MH2 domains. RI phosphorylation of Smad2/3 does all of these things. release Smad2/3 from the nucleus into the cytoplasm unmask the Smad2/3 nuclear localization signal (NLS).
The protein AKT/PKB is a critical regulator of essential cellular processes, and dysregulation of AKT has been implicated in many diseases, including cancer. In the present study, we wanted to test if levels of protein AKT changed in in EGF-stimulated epithelial, human breast cancer cell line when treated with varying concentrations of a drug Chondramide (ChB; 30 nM or 100 nM) for different lengths of time (1 or 24 h). Cellular lysate was prepared for each experimental condition, and an equal concentration of protein was loaded into a single lane of the SDS-polyacrylamide gel for each sample. We used western blot to measure the total levels of AKT and the fraction of Akt that is phosphorylated on the serine residue at position 473 (p-AktS473) using a phosphorylation specific antibody. GAPDH was used a loading control. EGF 30 nM ChB 100 nM ChB P-Ak47 total Akt GAPDH 0 0 + 0 0 0 0 0 1h 24h 1h 24h 0 Why do you think the researchers included GAPDH in the figure? A. B. C. D. Control for…
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