You conduct an experiment in which you inactivate Ras proteins in fibroblast cells.Which of the following is the most immediate consequence of this procedure?
A) The fibroblasts synthesized excess G protein.
B) The fibroblasts synthesized excess DAG.
C) The fibroblasts no longer responded to calmodulin.
D) The fibroblases no longer synthesized DNA in response to growth factors.
E) The fibroblasts divided uncontrollably.

Question

Quizplus · Accepted Answer

Ras proteins are involved in transmitting signals from growth factor receptors to the nucleus, promoting DNA synthesis and cell cycle progression. Inactivating Ras would prevent fibroblasts from synthesizing DNA in response to growth factors.

You Conduct an Experiment in Which You Inactivate Ras Proteins