the basic biological structures of life on earth are called cells.
the basic biological structures of life on earth are called?
cells
free-radical theory of aging









































the free radical theory of aging (frta) states that organisms age because cells accumulate free radical damage over time. a free radical is any atom or molecule that has a single unpaired electron in an outer shell. while a few free radicals such as melanin are not chemically reactive, most biologically relevant free radicals are highly reactive. for most biological structures, free radical damage is closely associated with oxidative damage. antioxidants are reducing agents, and limit oxidative damage to biological structures by passivating them from free radicals.
free-radical theory of aging
to clarify the underlying causes of mental disorders, it will be necessary to define, measure, and link basic biological and behavioral components of normal and abnormal functioning. this effort will require integration of genetic, neuroscience, imaging, behavioral, and clinical studies. by linking basic biological and behavioral components, it will become possible to construct valid, reliable phenotypes (measurable traits or characteristics) for mental disorders. this will help us elucidate the causes of the disorder, while clarifying the boundaries and overlap between mental disorders. in order to understand mental disorders in terms of dimensions and/or components of neurobiology and behaviors, it will be important to:
research domain criteria