In a food web, which of the below organisms converts the carbon in animal carcasses or waste back to atmospheric CO2? Select all that apply
A. primary producers
B. algae
C. fungi
D. decomposers
C,D
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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. 5,600 years old. B. 11,200 years old. C. 22,400 years old. D. 2,800 years old. E. 16,800 years old.
The mechanism for maintaining the solute concentration gradient in the medulla require(s)
A. active transport of Na+ ions from the ascending limb of the loop of Henle. B. active transport of Na+ ions from the ascending limb of the Vasa Recta. C. the ascending limb of the loop of Henle to be permeable to water. D. the descending limb of the loop of Henle to be impermeable to water. E. All of these are correct.
The horizontal transfer process known as transduction
A) involves a virus. B) requires a pilus. C) requires a cell to be "competent." D) requires a plasmid. E) involves a mutagen.
Which of the following is a true statement regarding species diversity and taxonomic diversity?
A) Species diversity measures the relative frequency of all alleles present in a species. B) In taxonomic diversity, the evolutionary relationships of species in a lineage are important. C) In species diversity, the number of animals in a particular lineage is important. D) The variety of species in a given area represents taxonomic diversity.