Double fertilization produces a triploid tissue from
the union of
a. one sperm nucleus and one female nucleus.
b. two sperm nuclei and one female nucleus.
c. one sperm nucleus and two female nuclei.
d. two sperm nuclei and two female nuclei.
e. one sperm nucleus and three female nuclei.
Answer: c
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Lupins are an angiosperm genus having "cluster roots," which are roots that have high metabolic rates and exude large quantities of organic acids to the soil. What purpose might exuding organic acids serve?
A. It provides energy for free-living soil microbes. B. It provides energy for symbiotic microbes. C. It raises soil pH to liberate tightly bound minerals. D. It lowers soil pH to liberate tightly bound minerals.
Leaves on the lower part of a bush primarily feed the ____
a. roots b. leaf tips c. stems d. upper leaves e. flowers
Despite their similar appearance, in what way are Ulva structures different from leaves?
a. They are unicellular. b. They do not contain chlorophyll. c. They do not contain differentiated cells. d. They do not contain cellulose.
Which is an example of a second messenger?
a. protein kinase A b. an ion channel c. cyclic AMP d. GABA e. insulin