3) Indicate by circling the T or F which of the following statements are True or

Question

3) Indicate by circling the T or F which of the following statements are True or False. (9pts) T/F a) Components of the extracellular matrix can serve as signaling ligands T/F b) Many different ligands can interact with distinct receptors in target cell membranes to activate signaling pathways. T/F c) Endocrine signaling involves membrane bound ligands and receptors. T/F d) Two cell types with the same receptor can be expected to respond similarly or identically to a given ligand T/F e) If the DNA, RNA and protein products of two cells are identical, they can still respond differently to an extracellular ligand binding a receptor on their surface T/F 1) All growth factors work through a single cell signaling pathway T/F g) Signal transduction pathways regulate early development primarily through transcriptional mechanisms T/F e) The specific events that occur during an induction event are determined by the cell that secretes the signal T/F The ability of a cell to respond to an inductive event varies based on stage of development, location with the embryo and potentially many other circumstances.

Explanation / Answer

3. a. TRUE

In multicellular organisms, growth factors, hormones, neurotransmitters, and extracellular matrix components are some of the many types of chemical signals cells use.

b. TRUE

c. TRUE

Endocrine signaling is long distance communication that is slow starting and long lasting haveing both protein and lipid (steroid) based ligands.

d. TRUE

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