In an experiment on wayfinding, indigo buntings were housed in outdoor cages with blotting paper
walls and inkpads on the floors. Which of the following facts demonstrated to researchers that the
indigo bunting uses the positions of stars to orient its migration?
a. The birds' inky feet made prints indicating the direction in which they attempted to fly.
b. In spring the inky footprints were mostly on the northern side of the cage.
c. In fall the inky footprints were mostly on the south side of the cage.
d. On cloudy nights the footprint patterns were random.
e. In spring and fall, the anterior pituitary of the bird's brain generated a series of hormonal
changes.
D
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Fick's law of diffusion states that the rate of diffusion of a gas across a membrane depends on all of the following except
A. the size of the gas molecule. B. which membrane transport proteins are present. C. the width of the membrane. D. the concentration difference of the gas on the two sides of the membrane. E. the membrane surface area.
How do animals living in the deep sea tolerate the high pressure and low temperature of these depths?
What will be an ideal response?
Ancestors of ____ may have possessed mitochondria, which were lost or reduced during evolutionary history
a. Paramecium b. Laminaria
c. Amoeba d. Euglena e. Giardia
A given enzyme works on
A. any number of different substrates. B. one of two possible substrates. C. no substrate. D. one type of substrate.