During cardiac arrest what event will occur?
a. Pacemaker malfunctions
b. Electrical signaling is disrupted.
c. Blood flow through the body stops.
d. Heart stops beating.
e. All of these choices.
e
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The half-life of carbon-14 is 5,600 years. A fossil that has one-eighth the normal proportion of carbon-14 to carbon-12 is probably
A. 2,800 years old. B. 5,600 years old. C. 11,200 years old. D. 16,800 years old. E. 22,400 years old. Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about half-lives of radioactive isotopes? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
In the absence of retroviruses, eukaryotes may also undergo reverse transcription if which of the following is present?
A) Alu B) retrograde viruses C) retrotransposons D) prions E) none of the above
Tropical rain forest soils are usually
A. nutrient-rich. B. nutrient-poor. C. low in organic matter. D. nutrient-rich and low in organic matter. E. nutrient-poor and low in organic matter.
A predictable effect of genetic drift in a small population is an increase in _____
a. mutations b. dominant alleles c. recessive alleles d. genetic variation e. homozygosity