A child has a history of recurring serious bacterial infections. A blood sample shows lymphocyte levels are a little below normal, and no antibodies to the pathogens are detected in serologic tests. Based on this information, which of the following is the likeliest diagnosis for this child?
A) Bruton-type agammaglobulinemia
B) Grave's disease
C) severe combined immune deficiency (SCID)
D) systemic lupus erythematosus (SLE)
E) hemolytic disease of the newborn
A
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You cut some sheep DNA and some plasmid DNA with the same restriction enzyme. The plasmid contains an AmpR gene and a lacZ gene. You mix together the fragments of sheep DNA and the linearized plasmid. You transform bacteria with your mixture, and plate the bacterial cells on growth media containing the antibiotic ampicillin and X-gal (the substrate of beta-galactosidase). You need to pick some bacterial colonies that contain recombinant plasmids. Which colonies do you choose?
A. any colony; if they grow on the media they are recombinant. B. the white colonies; only cells that contain a recombinant plasmid will be white. C. the blue colonies; any cells containing eukaryotic (sheep) DNA will be blue. D. the large colonies; large colonies are more resistant to the antiobiotic and thus more likely to contain a recombinant plasmid. E. any colony, all colonies will contain plasmids; it requires additional testing to determine if the plasmid is recombinant.
Which of the following is asserted by the unified cell theory?
a. The cell serves as the basic unit of life. b. All living things are composed of at least two cells. c. Very few new cells develop from existing cells. d. Organisms serve as the building blocks of cells.
The two body systems that play the largest role in animal behavior are:a
reproductive and digestive. b. reproductive and endocrine. c. nervous and reproductive. d. nervous and endocrine. e. reproductive and muscular
Which of the following is NOT a negative impact associated with hydroelectric power?
A. Sediments may deposit over time reducing or even stopping the flow of water. B. River and stream habitats are drastically altered or destroyed. C. Thermal pollution is released into the water. D. Carbon dioxide is released into the air. E. Aquatic biodiversity is reduced.