Notch is a receptor protein displayed on the surface of certain cells in developing fruit fly embryos. Notch's ligand is a membrane-bound protein called Delta that is displayed on the surface of adjacent cells. When Notch is activated by its ligand, the intracellular tail of the Notch protein becomes separated from the rest of the protein. This allows the intracellular tail to move to the cell's nucleus and alter the expression of specific genes.
Which of the following statements best explains Delta's role in regulating cell communication through the Notch signaling pathway?

Within a growing embryo, delta limits cell communication to short distances.
In the Delta-Notch signaling pathway, the receptor protein Notch plays a key role. Notch interacts with ligands like Delta to transduce short-range impulses.
The fruit fly embryo's growing short-range cell communication distances are constrained by delta.
Humans have 4 Notch receptors (Notch 1-4), which bind to a group of 5 ligands (Jagged 1 and 2 and Delta-like 1-3).
The Notch receptors are membrane-bound heterodimeric proteins that are expressed on the cell surface.
The ligand-binding that causes extracellular domain cleavage by an ADAM family metalloprotease and transmembrane domain cleavage by gamma secretase complex is what initiates signaling through the Notch receptors.

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