Ricin is a neurotoxin that is derived from:
A) a synthesized virus or bacterium.
B) mash that is left from the castor bean.
C) the leaves of the purple foxglove plant.
D) the seeds from a wide variety of fruits.
Answer: B) mash that is left from the castor bean.
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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.
Which sequence lists the structures from largest, most inclusive, to smallest?
A) muscle-thick filament-fascicle-muscle fiber-myofibril B) muscle-fascicle-muscle fiber-myofibril-thick filament C) fascicle-muscle-myofibril-muscle fiber-thick filament D) muscle fiber-myofibril-muscle-fascicle-thick filament E) thick filament-fascicle-myofibril-muscle-muscle fiber
Shade-grown coffee in mixed polycultures is a good example of _________________.
A. terracing B. a genetically modified crop C. agroforestry D. biomimicry E. Both C and D are correct.
Which of the following compounds is NOT an enzyme?
A) dehydrogenase B) cellulase C) coenzyme A D) ?-galactosidase E) sucrase