Answer to Question 1
Correct Answer: B
Answer to Question 2
Answer: Stromal cells express homing receptors for hematopoietic cells and produce components of the extracellular matrix (fibronectin, hemonectin, collagen, etc); they synthesize and secrete cytokines for growth, differentiation, and negative regulation; they produce membrane-bound cytokines for juxtacrine signaling (e.g., SCF, FL, SCI) to hematopoietic precursor cells.