The pons and medulla oblongata are part of the ____
a. thalamus
b. hypothalamus
c. cerebrum
d. brain stem
e. cerebellum
ANSWER: d
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The earliest RNA probably functioned in
A) catalysis. B) self-replication. C) both catalysis and self-replication. D) neither catalysis nor self-replication.
You are a botanist surveying a previously unstudied island. You discover a plant that has a small freeliving
gametophyte that requires external water for fertilization. After fertilization, a large sporophyte with xylem and phloem develops. The gametophyte dies, and the free-living sporophyte eventually releases spores from sporangia on the margins of its leaves. Into which group should you classify this plant?
a. cycads b. seedless vascular plants c. gymnosperms d. angiosperms e. monocots
After a biology field trip, you make a thin section of a flowering plant stem. You observe these two main sets of cells: the lower set of cells is large, has thick walls, and tests positive for the lignin molecule, while the smaller, but uniform red cells do not have lignin. From this evidence, you conclude that the larger cells with lignin are
A. rhizoids. B. phloem. C. xylem. D. cuticles. E. stomata.
Graves disease is an autoimmune disorder in which a person's thyroid is stimulated to produce too much thyroxine
Indicate whether the statement is true or false