Agricultural companies have developed the ability to control the genetic characteristics of their crops. Genetic engineering techniques have been used to produce all of the following effects except
A. grow salt-tolerant crop plants
B. decrease harvesting time
C. make crop plants resistant to disease
D. decrease soil nitrogen levels
Answer: D. decrease soil nitrogen levels
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Exposure of purified phospholipids to water results in the spontaneous formation of:
A. lipid bilayers. B. triacylglycerols. C. steroids. D. polypeptides. E. carbohydrates.
Five species of ants can be found on aspen sunflowers (Helianthella quinquenervis), which live in wet mountain meadows of the Rocky Mountains. The aspen sunflowers provide nectar to the ants in special structures called extrafloral nectaries
The ants, in turn, protect the sunflowers from other insects. The ants, however, are not found solely on the sunflowers—they can be found tending aphids on other flower species and collecting nectar from other species as well. This, then, is an example of a(n): A. obligate mutualism B. obligate antagonism C. facultative mutualism D. facultative antagonism E. none of the answer options are correct.
The most frequent clinical signs of chronic Chagas disease involve the enlargement of which organ?
a. Heart b. Liver c. Spleen d. Lung
Reinforcement is an evolutionary process that occurs in a hybrid zone in which parental species adapt
to two different communities, and the hybrids thrive in an area of transition between the parental communities. _______ Indicate whether the statement is true or false.