The Number of Stem Cells Appears to Gradually Decline with Age;

question 82

Multiple Choice

The number of stem cells appears to gradually decline with age; if so, how might this decline be explained?

• A)To maintain a stable number of stem cells, one daughter cell of each division would need to revert back to a stem cell; the rate of reversion must decline with age.
• B)Lacking specialization, stem cells must become more susceptible to disease processes than normal cells; eventually this susceptibility reduces their number.
• C)As they age, stem cells evidently lose their vitality, quit dividing, and die of old age without leaving any additional daughter cells.
• D)Continuous division with progressively shortened telomeres eventually produces a stem cell with critically missing DNA and a loss of an ability to further divide.

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Definitions:

Potential Donors

Individuals or entities likely to contribute resources, such as money or goods, to support the activities or goals of a nonprofit organization or cause.

Kohlberg

refers to Lawrence Kohlberg, a psychologist known for his theory of moral development, which suggests that individuals progress through stages of moral reasoning.

Preconventional Level

A stage in Kohlberg's theory of moral development where an individual's sense of morality is externally controlled, based on consequences for oneself rather than societal standards.

Moral Development

The process through which individuals learn and apply concepts of right and wrong behavior, guided by cultural, social, and ethical norms.