The ______ theory of aging states that people age because when cells metabolize energy, the by-products include unstable oxygen molecules that damage DNA and other cellular structures, leading to disorders.
Fill in the blank(s) with the appropriate word(s).
free-radical
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Todd is a twenty-seven-year-old stockbroker. One of Todd's more striking features is his height—just 4 feet 2 inches tall. His parents, brothers and sisters, grandparents, aunts, uncles, and cousins are all over six feet tall. Based on your knowledge of the interplay between genetics and environmental factors, what is the most likely explanation for Todd's height?
a. ?an inherited gene b. ?an early childhood illness c. ?a sedentary lifestyle d. ?genotype normalization
In Freud's theory of personality, to defend itself against the demands of the id and the superego, the ego will institute
a. the pleasure principle. b. the reality principle. c. problem-focused coping devices. d. ego defense mechanisms.
At the neural level, information is encoded by the ______ of action potentials
a. intensity b. complexity c. duration d. frequency
Between 3 and 18 months of age, the brain's weight increases by what percent?
A) 20% B) 30% C) 40% D) 50%