What evidence do we have that some asteroids have surfaces modified by geological processes?
What will be an ideal response?
On the asteroid Vesta, the central peak of the large Rheasilvia basin has a small positive gravity anomaly, indicating that the material there is denser, perhaps originating from deep within the asteroid. Geologists interpret the patterns in the mineralogical image to suggest that Vesta probably melted all the way through early in its history.
A class of meteorites that are spectroscopically identical to Vesta are thought to be fragments of that asteroid, perhaps blasted into space by the collision that created the big southern basin. Those meteorites appear to be solidified basalt lava, providing evidence that this asteroid once had geological activity.
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A protein region with a specific function and structure is called a
A) conserved site. B) domain. C) locale. D) motif.
The products of exergonic pathways are usually:
a. lower in energy b. higher in energy c. larger and higher in energy d. smaller and higher in energy e. smaller and lower in energy
Which cell type forms a protective coat on some seeds?
A. Tracheid B. Collenchyma cells C. Vessel member D. Sclereid E. Fiber
When preparing a wet-mount slide of onion cells, a student put a drop of Lugol's iodine stain was added to
a. prevent the formation of air bubbles b. make cell structures more visible c. increase the magnification d. increase the rate of photosynthesis in the cells