In this treatment of bacteria with cold transformation solution followed by heat-shock, the procedure
a. transformed cells.
b. nontransformed cells.
c. cells that have the gene for resistance to the antibiotic.
d. both a and c.
b
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Which of the following is a shared component of plant and animal cells?
a. ribosomes b. chloroplasts c. centrioles d. cell wall
Scientists believe that macromolecules could have been formed before there were living cells by
a. chemical processes removing water from components. b. oxidation of compounds containing phosphate. c. lightning discharge catalyzing addition of water to molecules. d. enzyme-mediated condensation reactions. e. acidic hydrolysis of compounds in the Earth's oceans.
Many forest plants and animals have been found to have chemicals in them that can be used for medicines. Which of the following is least helpful in preserving this resource?
A) eating more hamburgers B) limiting new housing developments C) encouraging paper and wood recycling D) promoting nut tree growing
A contributing factor to the spread of the SARS virus during the initial 2003 outbreak was
A) transmission of the virus in healthcare settings. B) similarity to 1918 influenza outbreak. C) air pollution in crowded urban environments. D) high smoking rates in Asia. E) global air travel.