Question

According to which theory is the given statement correct?
Statement: B and T cells having receptors for self-antigens undergo programmed cell death
A. Somatic mutation theory
B. Programmed senescence theory
C. Wear and tear theory
D. Immunological theory

Answer 1

There are many theories related to the aging process like somatic mutation theory, programmed senescence theory, wear and tear theory, and immunological theory. The aging process does not depend on a single factor.

Step by step answer:
All the theories are related to aging.
In option A, somatic mutation theory is mentioned. This theory states that the aggregation of mutations in the genome of somatic cells as a function of time effects in cellular function by decreasing it. Somatic cells are cells that are not capable of reproduction.
In option B, programmed senescence theory is mentioned. Programmed senescence theory states that aging is a vital and innate part of the biology of humans. Aging is programmed into our bodies Otherwise, we will be immortal. The body systems which are involved in programmed death are the endocrine system, the immune system, and genes.
In option C, wear and tear theory is mentioned. The wear and tear theory of aging states that the reason for aging is due to the progressive damage to cells and body systems with the passing of time. Our bodies wear out because it remains in constant function and then it can no longer function properly.
In option D, immunological theory is mentioned. The immunological theory of aging suggests that the aging process of humans is a simpler form of a prolonged autoimmune phenomenon. This means that aging involves multiple, highly complex series of events and processes which are considered to be regulated by the immune system of the body.
So, the correct option is option B as programmed cell death or apoptosis is explained in programmed senescence theory.

Note: There are multiple theories about the mechanisms of aging. Many of them are mutually exclusive. No one theory explains the process of aging independently. Some contradict with one another. Modern theories of aging in humans are categorized into two broad categories: programmed and damage or error theories.