Which of the examples below provides evidence of plant trade-offs?
A. Plants from nutrient-rich habitats grow
large and have few defensive compounds.
B. Plants growing in nutrient-poor soils do not
invest heavily in defense because they do not
have the resources.
C. Plants grown in a rocky habitat are
smaller.
D. Plants growing in a nutrient-rich habitat do
not produce many defensive compounds in
their leaves.
A
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Disulfide bonds (bridges) hold the two chains together
a. true b. false
Which of the following is not a characteristic of parenchyma cells?
a. They all lack the ability to photosynthesize. b. They can differentiate into other kinds of cells in response to an injury to the plant. c. They may contain various storage materials, such as starch grains, oils, or water. d. They must be living cells in order to function. e. They may secrete substances of various types.
In the cell cycle, controlled degradation of regulatory proteins occurs via the
A) P450-protease pathway. B) cyclin-Cdk pathway. C) ubiquitin-proteasome pathway. D) kinase inhibition pathway. E) PI3K-Akt pathway.
Which type of equilibrium is modeled in the following figure?
a. stable b. unstable c. mixed d. neutral e. complex