Systemin can correctly be described as a(n)
A. peptide.
B. apoplast.
C. receptor.
D. leaf lipid.
E. carbohydrate.
A. peptide.
Systemin is an 18-amino-acid peptide that when bound to a receptor initiates the release of jasmonic acid. This chemical then activates the production of a proteinase inhibitors which bind to the digestive enzymes of an herbivore.
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The reason coral reefs are among the most productive and successful ecosystems is due to
A. commensalisms. B. the lichen mutualistic relationship. C. the coral-dinoflagellate mutualistic relationship. D. All of the choices are correct.
Which describes the conditions of early Earth's surface? a. Molten rock that spewed gases
b. Barren desert. c. Covered with tropical rainforests. d. Completely covered with oceans. e. Covered with an ice sheet several meters thick.
Total lung capacity is indicated by ____
a. A + B b. B + C c. C + E d. D + E e. E + A
The transfer of _____________ from one molecule to another is an oxidation-reduction reaction, or redox reaction.
Fill in the blank(s) with the appropriate word.