The book mentions that maple syrup comes from the xylem sap of a tree. While this is true, why do you think most people assume it comes from the phloem sap?
What will be an ideal response?
The phloem mainly carries the sugars, and the xylem mainly carries the water, so one might think maple syrup would come from the more sugary phloem sap. Xylem sap has some sugar in it, but not much, which is why it has to be boiled down 50:1 to concentrate the sugars.
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A ribonucleoprotein is:
A. an enzyme that degrades RNA. B. an RNase that functions in the nucleus. C. a nucleotide-transport protein. D. a noncoding RNA complexed with protein.
Which of the following statements about the
pine cone is correct?
a. Cones are exclusively a female structure. b. Cones are the result of pollination. c. One type of cone produces both microspores and megaspores. d. Seeds are formed inside of fruits. e. One type of cone produces microspores; the other type produces megaspores.
Which of the following processes is NOT a part of external respiration?
A) the use of oxygen and generation of carbon dioxide by the mitochondria during energy metabolism B) the movement of air into and out of the lungs by bulk flow C) the transportation of oxygen and carbon dioxide between the lungs and body tissues by the blood D) the exchange of oxygen and carbon dioxide between the blood and tissues by diffusion E) the exchange of oxygen and carbon dioxide between the lungs and blood by diffusion
On both the eastern and western coasts of the USA, the subtidal zone contains very productive
a. seagrass meadows. b. Laminaria seaweeds. c. Ulva flats. d. both a and b e. both b and c