Which of the following statements about the "random events" theory of biological aging is true?
A) Genetic engineering that manipulates telomere activity has extended the lifespan of human cells.
B) Animal studies confirm an increase in DNA breaks and deletions and damage to other cellular material with age.
C) Because longevity tends to be a family trait, environmental factors have minimal impact on the aging process.
D) Humans who maintain higher levels of physical activity over several decades reduce their maximum lifespan.
B
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Measures of brain activity during tasks requiring intelligence indicate that, in order to solve the same problem, the brains of people with high scores on standard intelligence measures ____
a. ?do not have to work as hard as the brains of people with lower scores b. ?work harder than the brains of people with lower scores c. ?work more quickly than the brains of people with lower scores d. ?work less quickly but more accurately than the brains of people with lower scores
What is the main reason why fetal malnourishment has lasting effects even after the effects of malnourishment have disappeared?
a. Permanent motor damage is caused by fetal malnourishment. b. Fetal malnourishment causes children to have very low IQs. c. Mothers of children who had fetal malnourishment do not provide nourishing diets to children. d. There is less maternal interest in sickly infants.