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 divide uncontrollably.
B) The fibroblasts synthesize excess DAG.
C) The fibroblasts synthesize excess G protein.
D) The fibroblasts no longer respond to calmodulin.
E) The fibroblasts no longer synthesize DNA in response to growth factors.

Question

Quizplus · Accepted Answer

Ras proteins are involved in cell signaling pathways that control cell growth and division. Inactivating Ras proteins would disrupt these pathways, leading to an inability of fibroblasts to synthesize DNA in response to growth factors, which is necessary for cell division.

You Conduct an Experiment in Which You Inactivate Ras Proteins