The observation that most pureblood Native Americans have type O blood is best explained by
A. assortative mating.
B. a founder effect.
C. frequent mutations.
D. gene flow.
E. genetic drift.
Answer: B
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What is the key factor determining whether or not attenuation will occur when transcription of the E. coli trp operon has been initiated?
A. The trp operon repressor B. The level of tryptophan in the environment C. The activity level of adenyl cyclase D. The level of trp-tRNA that is charged with tryptophan
You want to simulate the production of carbon dioxide (CO2) in a laboratory setting using carbon and oxygen atoms. What type of reactions do you need to facilitate in order to create CO2?
A. An oxidation, or the gain of an electron, and a reduction, or the loss of an electron. B. An oxidation, or the loss of an electron, and a reduction, or the loss of an electron. C. An oxidation, or the gain of an electron, and a reduction, or the gain of electron. D. An oxidation, or the loss of an electron, and a reduction, or the gain of an electron.
Identify the stage of mitosis in photo B
a. interphase b. prophase c. metaphase d. anaphase e. telophase
Nematocysts are found only in
a. cnidarians. b. roundworms. c. crustaceans. d. echinoderms. e. arthropods.