According to the pressure-flow model, ____
a. water moves from an area of positive water potential to an area of negative water potential
b. the evaporative pull of transpiration produces tension at the top of the plant
c. the flow of sugar is driven by a pressure gradient between the source and the sink
d. pressure is created by the movement of water into the roots from the soil
e. the production of sugar pushes it out of the chloroplast and into the xylem
c
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A double stranded DNA strand contains 26 pyrimidines. How many purines will the copied strand contain?
A. 0 B. 13 C. 26 D. 52
Bacterial strains that are characterized by biochemical differences are called ________.
Fill in the blank(s) with the appropriate word(s).
Currently the two main vectors for delivery of therapeutic genes for human gene therapy are
A) AAV and retroviruses. B) AAV and Agrobacterium. C) Retroviruses and Agrobacterium. D) AAV and P elements.
Hyperventilation will cause changes inPCO2 that are detected by the chemoreceptors which causes a(n)
A) decrease in breathing rate only. B) increase in breathing rate and depth of breathing. C) decrease in breathing rate and depth of breathing. D) increase in breathing rate only. E) increase in depth of breathing only.