Speciation caused by the separation of the continents
is
a. divergence.
b. parapatry.
c. gene flow.
d. allopatry.
e. sympatry.
Answer: d
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An American nurse returning from serving in a hospital in the Congo experienced chills, fever, and sweats. The fever cycle peaked about every 48 hours. Which of the following is a likely diagnosis?
A. African sleeping sickness B. Malaria C. Leishmaniasis D. Histoplasmosis
Some species of orchids attract pollinating Hymenoptera (bees and wasps) with flowers that closely mimic the appearance of a female insect. As the male attempts to mate with the flower, he becomes loaded with pollen, helping the plant to reproduce. If one of these orchid plants acquired a loss-of-function mutation in a CYCLOIDEA-like gene, what do you predict might happen?
A. The mutation would quickly spread through the population. B. The mutant plants would have fewer available resources to devote to nectar production. C. The mutant plants would attract larger numbers of pollinating male insects. D. The mutation would fail to spread in the population. Clarify Question What is the key concept addressed by the question? What type of thinking is required? What do you already know about insects as pollinators? 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?
Homology is evidence of ________.
A. .natural selection B. binomial classification C. artificial selection D. common ancestry
Three scientists are using different forms of PCR for their research. Abby wants to determine changes in gene expression levels in a tissue, so she uses ________. Bob is trying to extract genetic information from a wooly mammoth fossil, so he uses ________. Chris needs to express a gene in bacteria that matches the form expressed in kidney cells, so she uses ________.
A. quantitative RT-PCR; PCR; RT-PCR B. RT-PCR; quantitative RT-PCR; PCR C. RT-PCR; PCR; quantitative RT-PCR D. quantitative RT-PCR; RT-PCR; PCR E. PCR; quantitative RT-PCR; RT-PCR