Which is the most widely accepted and supported model for explaining the movement of xylem sap?
a. the transpiration mechanism
b. the osmosis mechanism
c. the pressure flow mechanism
d. the cohesion-tension mechanism
Ans: d. the cohesion-tension mechanism
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If a population of 1000 individuals has 160 aa genotypes, the genotype frequency of the aa genotypeis:a
0.016. b. 0.08. c. 0.16. d. 0.8. e. 1.0.
What does the Genuine Progress Indicator (GPI) account for that the Gross Domestic Product (GDP) does not?
A. non-market values B. the benefits of ecological services C. environmental costs D. social costs E. All of the above are correct.
Root hairs absorb nutrients from soil against the nutrient concentration gradient. To achieve this, root hairs use _____.
a. proton pumps b. facilitated diffusion c. direct diffusion d. osmosis
Integrins link extracellular matrix proteins either directly or indirectly to all of the following intracellular proteins except
a. actin. b. alpha-actinin. c. laminin. d. talin.