In an Experiment to Track the Movement of Growth Factor

question 1

Multiple Choice

In an experiment to track the movement of growth factor molecules from secretion to the point of receptor binding in a particular species of mammal, a student found a 20-fold reduction in mm traveled when in the presence of an adrenal hormone. This is in part attributable to which of the following?

• A) The growth factor is a paracrine signal.
• B) The growth factor depends on osmosis.
• C) The mammal only carries growth factor through the lymph.
• D) The growth factor is an exocrine signal.
• E) The growth factor is an endocrine signal.

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