An ageing theory explaining the faulty synthesis of DNA, RNA, or both

RUHS, Jaipur, M.Sc Nursing Entrance Exam-2022

Applied Physiology

Easy

Appeared in: RUHS, Jaipur, M.Sc Nursing Entrance Exam-2022

Explanation

The Error Theory, part of the broader Stochastic/Damage theories, posits that aging is caused by the accumulation of random errors during cellular processes.
Specifically, it focuses on mistakes made during the replication of DNA or the transcription and translation of RNA.
These errors lead to the creation of faulty proteins and enzymes.
The accumulation of these non-functional or inefficient proteins impairs cellular function, leading to the characteristics of aging.

Option B: The Free Radical Theory attributes aging to damage caused by reactive oxygen species (ROS), or free radicals, which cause oxidative stress to lipids, proteins, and DNA. It is about damage from external/internal factors, not errors in the synthesis process itself.
Option C: The Cross-Link Theory proposes that aging results from the formation of chemical bonds, or cross-links, between proteins or other large molecules. This process makes tissues stiffer and less functional, like skin wrinkling or arteries hardening. It does not relate to errors in DNA/RNA synthesis.
Option D: Programmed theories suggest that aging is a deliberate process controlled by a biological clock or genetic programming. Examples include the shortening of telomeres with each cell division (Hayflick limit). This is a predetermined process, not a result of random synthesis errors.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Theories of Aging as background academic context rather than a clinical decision trigger.
Understanding theories of aging helps nurses appreciate that aging is a multifactorial process, not just a single disease.
This knowledge informs holistic care for older adults, including health promotion strategies like encouraging antioxidant-rich diets (addressing free radical damage) and regular exercise to maintain tissue flexibility (counteracting cross-linking effects).
It also helps in patient education, explaining that while some aspects of aging are programmed, lifestyle choices can mitigate damage-related factors.

How to Approach the Question

First, identify the key concept in the question stem. The crucial phrase here is 'faulty synthesis of DNA, RNA, or both'.
Next, analyze the options provided, which are all major biological theories of aging.
Recall the core principle of each theory.
Match the key concept from the stem ('faulty synthesis') with the definition of the theories.
The Error Theory directly corresponds to the idea of mistakes or errors accumulating in the genetic synthesis process.
Eliminate the other options by confirming their mechanisms are different (oxidative damage, protein binding, genetic predetermination).

Concept Tested & Keywords

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E6 Physiology Ganong 27e Vol 2 Part 2 pp. 26-28, 27-29