The typical movement of xylem sap from roots to shoot parts is best described as ____
a. facilitated diffusion
b. symport
c. guttation
d. osmosis
e. bulk flow
ANSWER: a
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The region at which the RNA polymerase binds is the ________ region.
A. coding B. leader C. promoter D. trailer
No change in volume will occur in a cell place in a ______ solution
Fill in the blank(s) with the appropriate word(s).
When the oxygen level in the blood is low, which of the following secretes erythropoietin, causing an
increase in red blood cell production? a. lungs b. kidneys c. liver d. spleen e. pancreas
Which step is not involved in the fertilization of angiosperm flowers?
A. Double fertilization produces an embryo and the endosperm. B. Pollen is transported to a stigma of a flower. C. When pollen reaches the stigma of a flower, it begins to grow a pollen tube that pierces the style. D. The style of the pistil contracts to bring the sperm closer to the embryo sac. E. The pollen tube grows until it reaches the ovule in the ovary.