It can be inferred from the results of the telomerase reactivation in aged telomerase-deficient mice (TERT-ER mouse) that telomerase reactivation in humans could: Not significantly reverse tissue degeneration, as it is not a main factor in aging Reduce tissue degeneration with surprisingly few side effects, as they behaved like stem cells Have rejuvenating effects, but increase the risk of cancer Causes more rapid tissue degeneration, as a longer telomerase is associated with aged cells. A 59-year-old man is found to have elevated IGF-1 levels, which helped him build muscle mass and maintain fertility earlier in life. However, his doctor now warns him about higher risks of cancer and metabolic disease. Which combination of aging theories best explains this tradeoff?单项选择题
A
Telomere Shortening Theory + Wear and Tear Theory
B
Free Radical Theory + Disposable Soma Theory
C
Antagonistic Pleiotropy Theory + Endocrine/Clock Theory
D
Error Catastrophe Theory + Cross-Linakage Theory

Question

It can be inferred from the results of the telomerase reactivation in aged telomerase-deficient mice (TERT-ER mouse) that telomerase reactivation in humans could: Not significantly reverse tissue degeneration, as it is not a main factor in aging Reduce tissue degeneration with surprisingly few side effects, as they behaved like stem cells Have rejuvenating effects, but increase the risk of cancer Causes more rapid tissue degeneration, as a longer telomerase is associated with aged cells. A 59-year-old man is found to have elevated IGF-1 levels, which helped him build muscle mass and maintain fertility earlier in life. However, his doctor now warns him about higher risks of cancer and metabolic disease. Which combination of aging theories best explains this tradeoff?单项选择题

A

Telomere Shortening Theory + Wear and Tear Theory

B

Free Radical Theory + Disposable Soma Theory

C

Antagonistic Pleiotropy Theory + Endocrine/Clock Theory

D

Error Catastrophe Theory + Cross-Linakage Theory

BlackTom AI · Accepted Answer

First, restating the question helps frame what we’re evaluating: It asks about what the telomerase reactivation results in aged, telomerase-deficient mice imply for humans, and then a separate scenario about aging theories explaining a tradeoff between IGF-1–related muscle-building and cancer/metabolic disease risk.
Option 1: Telomere Shortening Theory + Wear and Tear Theory. The telomere shortening theory focuses on telomere length as a driver of aging, while the wear-and-tear theory emphasizes cumulative damage over time. While these ideas touch on aging, they don’t directly capture the specific inference from telomerase reactivation studies in TER T-ER mice about reversibility or cancer risk, nor do they explain a tradeoff driven by hormones or endocrine signaling. This pairing misses the key concepts of rejuvenation potential vs. cancer risk linked to ongoing cellular proliferation and systemic signaling.
Option 2: Free Radical Theory + Disposable Soma Theory. The Free Radical Theory implicates oxidative damage as a driver of aging, and the Disposable Soma Theory posits tradeoffs between resource allocation for maintenance vs. reproduction. Although these are influential, they don’t specifically align with the telomerase reactivation data in aged mice or with an IGF-1–related tradeoff involving endocrine signaling and cancer/metabolic risk. The combination doesn’t directly address the rejuvenation vs. cancer risk tension tied to enhanced proliferative capacity.
Option 3: Antagonistic Pleiotropy Theory + Endocrine/Clock Theory. This pairing directly captures the essence of a tradeoff: genes or pathways that are beneficial early in life (e.g., promoting growth and reproduction via endocrine signals) can have deleterious effects later (elevated cancer risk, metabolic disease). The Endocrine/Clock Theory describes hormonal and circadian/aging-related regulatory mechanisms affecting aging and disease risk, which fits the IGF-1–related tradeoff scenario. Meanwhile, Antagonistic Pleiotropy explains why traits advantageous for reproduction or early fitness can have late-life costs, aligning with the cancer/metabolic disease risk described. This option matches both the telomerase/rejuvenation implication and the hormonal tradeoff narrative.
Option 4: Error Catastrophe Theory + Cross-Linakage Theory. These theories are not standard or widely recognized pairings in aging discourse, and they do not coherently map onto the observed telomerase reactivation effects or the IGF-1 tradeoff between muscle maintenance and cancer/metabolic risk. The terminology here doesn’t provide a coherent framework for the described biological phenomena.