Since hormones are present in such small amounts, how can their signals be amplified enough to ...

Answer to q. 1

Concepts to Consider: Through signal amplification, a single hormone-receptor complex can activate
the production of many cyclic AMP molecules. Each of these can then activate a protein kinase, which
phosphorylates many protein molecules. Thus, one hormone molecule can stimulate many proteins.

Answer to q. 2

Concepts to Consider: They first remove the tissue and replace it by transplanting similar tissue from
another animal. The changes caused by removing the tissue should be reversed when it is replaced.
Also, the suspected compound from the endocrine tissue of one animal is injected into another animal
that had that tissue previously removed. Replacement of the suspected hormone should relieve
deficiency symptoms. The chemical structure of the compound is then determined, synthesized in a
laboratory, and injected into experimental animals. If the effects are what were predicted, scientists
have enough data to support their hypotheses.

Thank you for taking the time to explain this, just got my quiz back: Perfect