Question

The theory of ageing holds that ageing is due to

• A. Random mutation in DNA of somatic cells.
• B. Increased cross-linkage of collagen and other proteins.
• C. Cumulative result of damage to tissues by free radicals.
• D. All of the above.

Answer 1

The correct option is D All of the above.

The somatic mutation theory holds that mutations are those inheritable changes, that occur in the cellular DNA.
The cross-linking theory of ageing suggest that with age some body proteins become cross-linked and may impede metabolic processes.
The free radical can accumulate and the cumulative result would be ageing.
Thus, the correct answer is option (D).