In the process of diffusion, molecules move from areas where
A. their concentration is higher to areas where their concentration is lower using energy from ATP.
B. their concentration is lower to areas where their concentration is higher through specific protein channels or carriers.
C. their concentration is lower to areas where their concentration is higher until an equilibrium is reached.
D. their concentration is higher to areas where their concentration is lower until an equilibrium is reached.
Answer: D
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Place the following steps of allopatric speciation in their correct order:
A. A flood causes a physical barrier down the middle of a population. B. A population covers a large area. C. The two separate populations evolve differently and form new species. D. When the water recedes, the two new species do not mate. 1. first event 2. second event 3. third event 4. fourth event
__________ are multiple copies of a short DNA sequence that follow one another along a
chromosome. Fill in the blank(s) with the appropriate word(s).
Staphylococcus aureus is a
Bilateria are characterized by
A. a plane of symmetry that forms mirror images around any plane through the longitudinal midline of the body. B. a plane of symmetry around a transverse plane across the center of the body so that the front and back halves are mirror images. C. a plane of symmetry that forms mirror images around a vertical plane in the midline. D. a plane of symmetry that forms mirror images around an oblique plane in the midline. E. a plane of symmetry that forms mirror images around a horizontal plane in the midline.