The half-life of carbon-14 is 5730 years. If a sample contained 100% carbon-14 and 0% nitrogen-14 at a point in time 17,190 years ago, then what percentage of carbon-14 would it contain today?
A. 12.5%
B. 25%
C. 50%
D. 75%
E. 100%
A
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Edema (swelling) occurs when ________.
a. collagen fibers enlarge as they change from dehydrated to hydrated shape b. areolar tissue soaks up excess fluid in an inflamed area c. reticular connective tissue invades the area d. adipose cells enlarge by pinocytosis
The increased mortality of coniferous trees in the Pacific Northwest between 1955 and 2007 is an example of a
reaction to ____.
a. density-independent factors b. density-dependent factors c. predation d. crowding e. population growth
Based on genetic comparisons,
a. people of different races often have more genetic similarities than many individuals within a race. b. humans have a more ancient origin than chimpanzees. c. there is much genetic diversity among cheetahs. d. among humans, many genetic variations are restricted to certain racial groups. e. there is no difference between different races of humans.
The primary transcripts in eukaryotes are most accurately described as
A. a faithful copy of the entire gene including exons and introns. B. an exact copy of the gene, but the introns have been removed. C. an RNA copy, but the noncoding exons and introns have been removed. D. having the exons removed and the introns retained for translation. E. composed of RNA polymerase and associated histones.