Example of direct signaling

timer Asked: Apr 11th, 2016

Question description

The cells that make up multicellular organims send, receive, and respond to a variety of signals. Which of the following is an example of direct signaling?

  1. During wound healing, platelet cells produce a growth factor that induces nearby cells to divide.

  2. Junctions between adjacent plant cells connect their cytoplasms and allow them to share molecules.

  3. Mutated cancer cells produce as well as respond to growth signals, resulting in tumor growth.

  4. Pancreas cells produce and release insulin into the bloodstream to induce liver cells to uptake and use glucose.

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