When looking at the carbon isotopes present in the atmosphere, scientists determined that 13C and 14C levels had decreased over time. What did researchers conclude from these observations? Select all that apply
A. that volcanic activity is responsible for
increased atmospheric CO2
B. that the burning of forests is responsible
for increased atmospheric CO2
C. that the use of fossil fuels is responsible
for increased atmospheric CO2
D. that increased plant/animal respiration is
responsible for increased atmospheric CO2
C
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What type of methods are used in microbial systematics? Why are multiple methods used to characterize and classify microbial species? Be sure to define the methods and describe the general strengths and weaknesses of each type
What will be an ideal response?
RNA polymerase is called a ________, meaning it is an intact complex with full enzymatic capacity
Fill in the blank(s) with correct word
Deletions are chromosomal aberrations in which some portion of a chromosome is missing. Describe a method using Drosophila deletions to determine the actual, physical location of a gene
What will be an ideal response?
The common edible frog of Europe is a hybrid between two species, Rana lessonae and Rana ridibunda. The hybrids were first described in 1758 and have a wide distribution, from France across central Europe to Russia Both male and female hybrids exist, but when they mate among themselves, they are rarely successful in producing offspring. What can you infer from this information?
A) Postzygotic isolation exists between the two frog species. B) Prezygotic isolation exists between the two frog species. C) These two species are likely in the process of fusing back into one species. D) The hybrids form a separate species under the biological species concept.