The term that best describes a symbiotic relationship in which two different microorganisms occupy the same ecologic niche but have absolutely no effect on each other is:
A) commensalism.
B) mutualism.
C) neutralism.
D) parasitism.
C) neutralism.
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Which of the following statements best describes DNA polymerase?
A. It is an enzyme required to produce a primer needed for DNA replication. B. It is an enzyme that catalyzes the addition of nucleotides to the 5? end of a growing DNA strand. C. It is an enzyme that catalyzes the addition of nucleotides to the 3? end of a growing DNA strand. D. It is an enzyme required to glue pieces of DNA fragments together. E. It is an enzyme that polymerizes the DNA and keeps the replication fork open.
During the Uruguay round of GATT negotiations, the United States sought to
a. liberalize trade in agricultural products. b. increase the number of quotas on finished goods. c. liberalize the use of embargoes. d. tighten the role of GATT in excluding services.
Over the last 50 years, scientists have recorded an increase in the average atmospheric carbon dioxide. Which of the statements would be the best reason for these findings?
A) Removal of large sections of rain forests through deforestation. B) Testing equipment has become more sophisticated allowing scientists to get better results. C) Atmospheric carbon dioxide increases normally in a 50-year time span. D) More organisms exist on Earth's surface now compared with 50 years ago.
You genetically engineer an Arabidopsis plant to have a mutation in gene B. Which of the following phenotypes would you expect to see as a result of this mutation?
A. sepals-petals-sepals-petals B. sepal-sepal-carpel-carpel C. sepals-petals-stamens-carpel D. carpels-carpels-stamen-stamen E. petals-petals-stamen-stamen