Although "dry tombing" or capping a landfill after it is full is necessary, what problem can it create?
A- Leachate can break through the lining.
B- Biodegradable waste can remain for decades in a landfill.
C- Waste becomes more toxic when confined.
D- The lining does not allow for microorganisms to enter the landfill
E- The lining creates a hazard for landfill workers.
B- Biodegradable waste can remain for decades in a landfill.
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Some animal viruses may enter a ____ stage in which the virus remains in the cell in inactive form
a. latent b. virulent c. temperate d. transformation e. lytic
You are observing a cell through a microscope and note that it has no apparent nucleus. You conclude that it most likely
a. Has a peptidoglycan cell wall. b. Has a cellulose cell wall. c. Moves by pseudopods. d. Is part of a multicellular animal. e. Is a plant cell.
_______ occurs as a long-thin strand of DNA protein complex, found in a loosely packed formation, while ________ are formed by a tighter packing, via coiling and compact folding of the DNA protein complex are thus visible.
Fill in the blank(s) with the appropriate word(s).
In the photosynthetic archaean Halobacterium halobium, a membrane transport protein called bacteriorhodopsin captures energy from sunlight and uses it to pump protons out of the cell
The resulting proton gradient serves as an energy store that can later be tapped to generate ATP. Which statement best describes how bacteriorhodopsin operates? (a) The absorption of sunlight triggers a contraction of the ? barrel that acts as the protein's central channel, squeezing a proton out of the cell. (b) The absorption of sunlight triggers a shift in the conformation of the protein's seven, membrane spanning ? helices, allowing a proton to leave the cell. (c) The absorption of sunlight triggers a restructuring of bacteriorhodopsin's otherwise unstructured core to form the channel through which a proton can exit the cell. (d) The absorption of sunlight triggers the activation of an enzyme that generates ATP.