A community of organisms and the physical environment it occupies are known together as a(n)____
Fill in the blank with the appropriate word.
ecosystem
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Use the following graph and information to answer the question below
Flycatcher birds that migrate from Africa to Europe feed their nestlings a diet that is almost exclusively moth caterpillars. The graph below shows the mean dates of arrival, bird hatching, and peak caterpillar season for the years 1980 and 2000. The shift in the peak of caterpillar season is most likely due to _____. A) pesticide use B) earlier migration returns of flycatchers C) an innate change in the biological clock of the caterpillars D) global warming E) acid precipitation in Europe
During the first step of nitrification, ammonium is converted into ________
a. water vapor b. carbon dioxide c. nitrite d. nitrate e. nitrogen gas
A patient's serum is analyzed and found to have an abnormally low level of CD8 molecules. This
suggests that the patient has insufficient numbers of
a. macrophages. b. B cells. c. cytotoxic T cells. d. helper T cells. e. NK cells.
Which feature is true for RNA polymerase activity but NOT true for DNA polymerase activity?
a. Precursor nucleotides can contain adenine, guanine, or cytosine. b. Growth of nucleotide sequence is only in the 5??3? direction. c. Newly synthesized strands are antiparallel to its template strand. d. Nucleotide primer is unnecessary.