Final answer:
Stem cells need to maintain DNA integrity to prevent mutations and ensure they can properly perform their functions of division and differentiation, which are essential for tissue growth and repair.
Step-by-step explanation:
Stem cells need to maintain DNA integrity to prevent mutations and ensure proper cellular function. This is crucial for stem cells because they have the unique ability to divide without limit and can differentiate into various specialized cells necessary for tissue growth and repair. Maintaining DNA integrity allows stem cells to protect against the accumulation of genetic errors, which could compromise their ability to both self-renew and properly differentiate, ultimately affecting the organism's health and vitality.
It's also important to note that while cells are programmed to divide a specific number of times, stem cells are an exception in that they can divide indefinitely. However, if the DNA integrity of these cells is compromised, their division can lead to defective cells or even cancerous growths. Moreover, the DNA repair ability of a cell is vital for the integrity of its genome and the normal functioning of the organism, including the process of differentiation where cells become specialized.