Root nodules contain ______, which can ______.
a) Azotobacter, fix N2
b) Bitrosomonas, nitrify NH3
c) Rhizobia, fix N2
d) Bacillus, denitrify NO3
Ans: c) Rhizobia, fix N2
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Influenza pandemics occur cyclically because
A) less than 100% of the population is immunized. B) new strains emerge due to reassortment between bird, swine, and human variants. C) the vector is seasonal. D) there are environmental reservoirs that release the virus during particular seasons.
Atoms of a single element that possess different numbers of neutrons are called:
A. isomers. B. polymers. C. ions. D. isotopes. E. monomers.
During which of the following stages of meiosis does the cell contain the LEAST amount of DNA?
A. telophase II B. prophase II C. anaphase I D. prophase I
Which of the following sequences places the steps of viral replication in the correct order? Assume the virus uses DNA as its genetic material.
a. New viral proteins are synthesized by the host cell ribosome, viral DNA is replicated, virus binds to host cell membrane, new viruses assemble and break out of the cell, viral mRNA is transcribed from viral DNA b. Viral mRNA is transcribed from viral DNA, new viral proteins are synthesized by the host cell ribosome, virus binds to host cell membrane, viral DNA is replicated, new viruses assemble and break out of the cell c. Virus binds to host cell membrane, viral DNA is replicated, viral mRNA is transcribed from viral DNA, new viral proteins are synthesized by the host cell ribosome, new viruses assemble and break out of the cell d. Viral mRNA is transcribed from viral DNA, new viral proteins are synthesized by the host cell ribosome, viral DNA is replicated, new viruses assemble and break out of the cell, virus binds to host cell membrane Viral DNA is replicated, new viruses assemble and break out of the cell, new viral proteins are synthesized by the host cell ribosome, viral mRNA is transcribed from viral DNA, virus binds to host cell membrane