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

In research on ageing (both cellular ageing and organismal ageing) , 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 signalling?

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.

Correct Answer:

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