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 would provide evidence that this is related to cell signaling?
A) Growth factor ligands do not bind as efficiently to receptors.
B) Their lower hormone concentrations elicit a lesser response.
C) cAMP levels change very frequently.
D) Enzymatic activity declines.
E) ATP production decreases.

Question

Quizplus · Accepted Answer

The efficiency of growth factor ligand binding to receptors is an aspect of cell signaling, and if it is hindered in aged cells, this provides evidence that altered cell signaling may be responsible for their altered progression through the cell cycle. The other choices do not directly relate to cell signaling.

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