All EXCEPT which of the following are associated
with sclerenchyma?
a. lignin
b. photosynthesis
c. transport
d. sclereids
e. fibers
Answer: b
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Ammonia _____
A) is soluble in water B) can be stored in the body as a precipitate C) has low toxicity relative to urea D) is metabolically more expensive to synthesize than urea E) is the major nitrogenous waste excreted by insects
In what general way are regulons regulated?
A) Regulons can be under both positive or negative control. B) Regulons are under negative control exclusively. C) Regulons are under positive control exclusively. D) Global regulation of regulons depends on the regulatory guidance of RNA polymerase II. E) Regulons are regulated by feedback translation loops.
If the partial pressure of oxygen (pO2) in a man's blood plasma decreased below that in his red blood cells, what would be the result?
A. More oxygen would diffuse into his red blood cells and be transported throughout his body. B. Oxygen would diffuse out of his red blood cells, and less oxygen would be transported throughout his body. C. The concentration of oxygen would be the same in red blood cells and blood plasma.
Which of the following was propagated and promoted for use by the Soil Conservation Service but is now listed as a Federal Noxious Weed?
A) purple loosestrife B) Australian paperbark tree C) kudzu D) evening primrose