The element carbon has atomic number 6. Carbon most likely
A) forms ionic bonds with other atoms. B) forms four covalent bonds.
C) donates two electrons to another atom. D) shares two electrons with another atom.
B
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Bony fishes possess two features not found in other fish. Select the best choice from those listed below to complete the following sentence. Bony fishes have
A. swim bladders and gill covers called opercula. B. swim bladders and a complete digestive system. C. swim bladders and a closed circulatory system. D. swim bladders and movable jaws.
A researcher planned to duplicate the Luria Delbruck fluctuation experiment. This researcher inoculated twenty samples of liquid nutrient media with bacteria from the same colony and let them grow overnight. The next morning the researcher noticed that all but one of the flasks had come open and were ruined. Not wishing to redo the experiment, the researcher spread samples of bacteria from the one intact liquid culture on twenty petri plates that had nutrient agar infused with bacteriophage. What results do you expect the researcher obtained from this experiment?
A) All plates had some bacterial colonies; some plates had more bacterial colonies than others. B) Some plates had no bacterial colonies; others had varied numbers of colonies. C) All plates had a similar number of bacterial colonies. D) Some plates had no bacterial colonies; all of the other plates had a similar number of bacterial colonies. E) No bacterial colonies formed on any of the plates.
The Human Genome Project accomplishes all of the following except:
a. sequencing the entire human genome. b. identifying all of the genes in the human genome. c. the foundation for studying gene function in humans. d. basis for studying variations in gene sequences related to illness. e. imprinting a gene with the phenotype of the parent
Which of the following relationships is correct?
a. insects: Malpighian tubules: urea as major nitrogenous waste b. annelids: protonephridia: ammonia as major nitrogenous waste c. freshwater fish: kidney: large volume of hypertonic urine d. sharks: kidney: large volume of hypotonic urine e. earthworm: kidney: ammonia as major nitrogenous waste