The Free-Radical Theory States That Aging Is Caused by

question 93

Multiple Choice

The free-radical theory states that aging is caused by

• A)damage to DNA.
• B)the body's lowered resistance to stress and disease.
• C)biological constraints on cell division.
• D)nutritional deficiencies.

---

Definitions:

Aerobes

Organisms that require oxygen to survive and grow.

Upper Respiratory Tract

The part of the respiratory system that includes the nose, nasal passages, pharynx, and larynx, through which air enters and exits the body.

Normal Flora

Microorganisms, including bacteria and fungi, that reside in or on the body without causing disease under normal conditions.

Natural Immunity

The inherent ability of an organism to resist certain diseases without the need for vaccinations or immunotherapy.