When leaves are actively transpiring at a high rate:
A. the risk of vessel collapse is reduced
because the leaves exert a great deal of
tensile force.
B. the chance that an air bubble will form is
decreased.
C. the force created pulls vessel walls inward.
D. air will only leak into a vessel if that vessel
is broken or damaged.
E. the chance of vessel collapse is reduced
due to the high volume of water transport.
C
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In what phase of the cell cycle does a typical
cell spend most of its life?
a. interphase b. prophase c. metaphase d. anaphase e. telophase
The principal difference between a saprophytic and
parasitic mode of nutrition is a. the quality of the nutrients. b. the species of fungus that possess it. c. determined by the quantity of available nutrients. d. determined by the source of the nutrients. e. whether the digestion is intracellular or extracellular.
Archaea have very diverse environmental requirements and tolerances. From what you have learned about them, which among the following conditions or substances do ALL archaeans require for survival and reproduction?
A. moderate salinity B. moderate pH C. moderate temperature D. oxygen E. carbon
In an analysis of independent contrast, researchers found that fetuses had faster growth rates in polyandrous than in monogamous species of primates. How did the researchers interpret the results?
a. Fetuses develop faster to "make room" for offspring from a different male. b. Extracting more resources from the mother maximizes offspring's inclusive fitness in polyan-drous species. c. Fast fetal growth rates are always optimal. d. Fetal growth rates represent phylogenetic constraints and are unrelated to mating system.