Haemopoietic stem cells differ from committed progenitor cells in bone marrow in :
**Core Concept**
Haemopoietic stem cells are a type of multipotent stem cell that has the ability to self-renew and differentiate into all blood cell types. Committed progenitor cells, on the other hand, are more specialized cells that have already begun to differentiate into specific blood cell lineages.
**Why the Correct Answer is Right**
Haemopoietic stem cells are characterized by their ability to self-renew, meaning they can divide to produce two daughter cells that are also stem cells. This is in contrast to committed progenitor cells, which have a limited capacity for self-renewal and are instead focused on differentiating into specific blood cell types. The self-renewal ability of haemopoietic stem cells is mediated by the Wnt/β-catenin signaling pathway and other molecular mechanisms that regulate cell cycle progression.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the key difference between haemopoietic stem cells and committed progenitor cells.
**Option B:** This option is incorrect because, while it is true that haemopoietic stem cells can differentiate into all blood cell types, this is not the key difference between them and committed progenitor cells.
**Option C:** This option is incorrect because it is a characteristic of committed progenitor cells, not haemopoietic stem cells.
**Clinical Pearl / High-Yield Fact**
It's worth noting that haemopoietic stem cells are responsible for the production of all blood cells throughout a person's lifetime, including red blood cells, white blood cells, and platelets. This highlights the importance of stem cell biology in understanding blood disorders and developing therapies for conditions such as leukaemia.
**Correct Answer: C. Ability to self-renew**