The enzyme nitrogenase is irreversibly inhibited by excess
a. O2.
b. NO3
?.
c. N2.
d. CO2.
e. NH4
+.
A
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. A sample must contain many microorganisms in order to see any using microscopy techniques. Why?
A. The area on a microscope slide is very large compared to the relative size of microbes, and you take a very small amount of your sample to place on the slide surface. Therefore, you must have a large number of microbes initially in the culture to increase the chances that you'll come across one or more when looking at the slide surface through the magnifying lenses of the microscope. B. Bacteria are very small, of course. If you don't have a LOT of them, how are you going to see them? C. This is false-microscopy allows us to magnify a specimen to the point where we would be able to visualize even just a few microbes on the surface of the slide. As such, even if there are only a few microbes in a sample, we could easily visualize them with a microscope. D. Microscopes only magnify what's on the slide. If you don't have a lot of microbes on the slide surface, you can't magnify the specimen enough to see them as individual cells.
Keratins are structural proteins in skin, hair, and fingernails. One gene, called KRT10, is located on the 17th paired chromosome in humans. It produces a keratin that strengthens skin cells. Researchers have identified several mutations that can lead to rough, damaged, blistering skin because the keratins are not as strong as normal. Each mutation changes a specific amino acid at a particular location in the protein, and so is an example of a(n) mutation.
A. missense B. duplication C. insertion D. nonsense E. frameshift
During the last decade, the U.S. Fish and Wildlife Service has worked to reestablish the critically endangered California condor in its last stronghold, the mountains of southern California
Recently, the service has also tried to establish a second population in the Grand Canyon region of Arizona. Why would the Fish and Wildlife Service consider it a high priority to establish two populations that are geographically distant from each other? A) Multiple condor populations reduce inbreeding. B) Multiple condor populations provide more opportunities for people to view the endangered species, which may cause more people to be concerned with its fate. C) Multiple condor populations reduce genetic drift within each population. D) Multiple condor populations reduce the risk of extinction due to localized catastrophes.
________ is an autoimmune disease characterized by the presence of antibodies that bind to and block acetylcholine receptors
Fill in the blank with correct word.