Discussion
A hormone is effective at a blood concentration of 10 nanomolar. How many times more dilute is that than a 10 millimolar metabolite?
Answer: D
Millimolar is a thousandth of a mole and nanomolar a billionth, so the ratio is a million. Amplification within the cell is what allows such tiny quantities to have an effect. Without amplification such concentrations would be useless as signals.
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