Why do aquatic systems seem particularly vulnerable to disruption by exotic consumers?
A) because higher temperatures result in faster population growth
B) because humans typically ignore problems in aquatic systems
C) because of the predominance of top-down control of community structure by consumers
D) because of the low productivity of aquatic ecosystems
Ans: C) because of the predominance of top-down control of community structure by consumers
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To avoid the introduction of introns into the vector, a ____ copy of mature mRNA is made, using the enzyme ____
a. sDNA; RNA polymerase b. cDNA; DNA ligase c. cDNA; reverse transcriptase d. sDNA; reverse transcriptase e. cDNA; DNA polymerase
Hormones are synthesized from cholesterol are part of the ____ group of hormones
a. fatty acid derivatives b. steroid hormones c. amino acid derivatives d. peptide hormones e. protein hormones
Where would you find immature cicadas?
a. In the trees b. Underground c. In water d. Any of the above
What route is being followed by water that moves through nonliving regions of a root, such as air spaces in root tissue?
a. the apoplastic, transmembrane, and epidermal pathways b. the symplastic, transmembrane, and transepidermal pathways c. the transmembrane, epidermal, and transepidermal pathways d. the apoplastic, transmembrane, and symplastic pathways