Stem Cells' Roles in Repair and Differentiation

Steps:

• Recall stem cell definition: undifferentiated cells capable of self-renewal and specialization into various cell types.
• Assess repair: stem cells enable tissue repair indirectly via differentiation, not direct cellular repair action.
• Assess phagocyte formation: hematopoietic stem cells differentiate into immune cells, including phagocytes like macrophages.
• Match to options: identify row aligning with indirect repair (no) and differentiation capability (yes).

Why D is correct:

• Stem cells lack direct repair mechanisms but produce phagocytes through hematopoietic differentiation, per cell biology principles.

Why the others are wrong:

• A: incorrectly states phagocyte formation as no, ignoring stem cell differentiation pathways.
• B: wrongly affirms direct repair, as stem cells do not perform it themselves.
• C: falsely denies both, overlooking stem cells' role in immune cell production.

Final answer: D