The half-life of carbon-14 is approximately 5,700 years. How much of an initial 1.0 gram sample of carbon-14 will remain after 11,400 years (two half-lives)?
a. 0.33 grams (33%)
b. 0.5 grams (50%)
c. 0.25 grams (25%)
d. 0.12.5 grams (12.5%)
c
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In a certain population with a mean IQ of 100, the heritability of IQ was measured at 0.6. A chapter of
Mensa in this population has an average IQ of 140. If they are otherwise typical of their population, about how many of their IQ points can be attributed to their genes? A. 60 B. 84 C. 24 D. 100 E. 40
Troponin and tropomyosin regulate:a
calcium storage and release. b. actin and myosin interactions. c. action potential transmission. d. acetylcholine storage and release. e. rate of muscle fiber division.
During menopause:a
estrogen levels rise. b. menstruation ceases. c. many ova are released. d. women experience cold flashes. e. all of these are correct
The shape of a virus is determined by
its DNA. its RNA. its envelope. its host. its coat protein organization