An organism found in the deep hot biosphere that used hydrogen as an electron donor and sulfate as a terminal electron acceptor would be categorized as which of the following?
A. A sulfate oxidizing photoautotroph
B. A sulfate reducing chemoautotroph
C. A nitrogen reducing photoautotroph
D. A nitrogen reducing chemoautotroph
Answer: B
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How can you recognize a reliable source of information?
A. By checking whether the information was peer-reviewed B. By checking whether the source of information is primary C. By checking whether the authors are well qualified D. All of the above are ways to check whether a source is reliable
Which of the following explains the difference between VNTRs and RFLPs?
A. In VNTRs, we are looking at sequence differences in genes; in RFLPs we are looking at sequence differences in noncoding DNA. B. In VNTRs, we are looking at sequence differences in noncoding DNA; in RFLPs we are looking at sequence differences in genes. C. In VNTRs, we are looking at the number of times a sequence is repeated; in RFLPs we are looking at size differences resulting from different restriction sites being present. D. In VNTRs, we are looking at size differences resulting from different restriction sites being present; in RFLPs, we are looking at the number of times a sequence is repeated.
In a mutualistic relationship with a plant, the fungus receives
a. minerals. b. protection. c. sugar. d. water.
Why is the Hardy-Weinberg principle useful to biologists?
a. It describes most populations.
b. It proves that Mendel was correct for populations. c. It explains the existence of variation in populations. d. It explains the existence of a large number of species. e. It identifies those factors that can change allele or genotype frequencies