Which region(s) of the brain, present in a 5-week old embryo, is/are derived from the midbrain?
a. telencephalon only
b. diencephalon only
c. mesencephalon only
d. telencephalon and diencephalon
e. telencephalon and mesencephalon
ANSWER: c
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In humans and other mammals, dosage compensation is achieved by:
A. males transcribing double the normal amount of copies of X-chromosome genes. B. females decreasing transcription of both X chromosomes by ½. C. females eliminating one X chromosome in each cell. D. females inactivating the paternal X chromosome in each cell. E. females randomly inactivating one X chromosome in each cell.
Where in the eudicot plant root would you expect to find vascular tissue?
A. in the center B. near the edge C. between the ground and dermal tissue D. scattered in the root E. parallel to the edge
You discover a new bird species, but so far have only observed ten nesting females. The female birds are small and mostly brown, with a bit of red around their tails and throats. After the eggs hatch, you perform genetic tests which reveal that all chicks within a nest share the same father, but some chicks across nests also share a father. Based on this, what would you predict about the males of this species?
A. They are larger than the females with more coloration. B. They appear very similar to the females. C. They are smaller than the females with less coloration. D. They are similar in size to the females with more coloration.
The regulatory systems of the animal body maintain a relatively stable internal condition through a process called ____________________.
A. equilibrium B. absorption C. osmoreception D. homeostasis E. countercurrent exchange