In research on aging (both cellular aging and organismal aging), it has been found that aged cells do not progress through the cell cycle as they had previously. Which of the following, if found in cells or organisms as they age, would provide evidence that this is related to cell signaling?
A) Growth factor ligands do not bind as efficiently to receptors.
B) Hormone concentrations decrease.
C) cAMP levels change very frequently.
D) Enzymatic activity declines.

Question

Quizplus · Accepted Answer

The decreased efficiency of growth factor ligands binding to receptors suggests that there may be a disruption in cell signaling pathways, which could be a contributing factor to the altered progression of the cell cycle in aging cells.

In Research on Aging (Both Cellular Aging and Organismal Aging)