Health officials measure ____ to evaluate if disease agents are present
a. byssal thread density
b. changes in species composition
c. coliform bacteria
d. the oyster index
e. water density
C
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Farmers often grow legumes such as soybeans every few years and plow much of the plant parts into
the soil. This practice serves mainly to replenish the soil with useful forms of
a. carbon. b. nitrogen. c. phosphorus. d. oxygen. e. manganese.
Which of the following does a cell require to transport substances against an electrochemical gradient?
a. ATP b. Na + c. K + d. Phosphates
A chromosome's gene sequence that was A-B-C-D-E-F-G before damage and A-B-C-F-G after is an example of ____
a. inversion b. deletion c. duplication d. translocation e. cross over
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