If the half-life of a radioisotope is 20,000 years, then a sample in which three-quarters of that radioisotope has decayed is _____ years old
a. 15,000
b. 26,667
c. 30,000
d. 40,000
D
Biology & Microbiology
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Where were the first Ediacaran fossils discovered?
a. Africa b. North America c. Australia d. Asia
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The distribution of mitochondria between the daughter cells during cytokinesis
a. is random. b. is directed by the mitotic spindle. c. is directed by the centrioles. d. results in the mitochondria remaining in the parent cell. e. occurs only during meiosis.
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Many bacteria and fungi have a difficult time surviving on our food if the food is very salty. The best explanation for this is...
What will be an ideal response?
Biology & Microbiology
DNA strands can be clipped crosswise at selected positions by using enzymes called
A. DNA polymerases. B. ligases. C. palindromes. D. reverse transcriptases. E. restriction endonucleases.
Biology & Microbiology