The three main forms of nitrogenous wastes found in animals are
A. ammonia, urea, and uric acid.
B. uracil, urea, and uric acid.
C. amino acids, uracil, and uric acid.
D. ammonia, urea, and amino acids.
E. ammonia, urea, and uracil.
Answer: A
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Non-disjunction is the failure of homologous chromosomes to separate during meiosis I, or the failure of sister chromatids to separate during meiosis II or mitosis. As a result, both homologous chromosomes or both sister chromatids migrate to the same pole of the cell. This produces daughter cells with an imbalance of chromosomes. If 18 pairs of sister chromatids segregate normally during meiosis II in cats (n=19) but we have non-disjunction of 1 pair, then at the end of meiosis II we will have
A. 3 cells with 20 chromosomes and 1 cell with 18. B. 2 cells with 20 chromosomes and 2 cells with 18. C. 2 cells with 19 chromosomes, 1 with 20, and 1 with 18. D. 3 cells with 18 chromosomes and 1 cell with 20. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you know about non-disjunction? How does it relate to the question? Consider Possibilities · What other information is related to the question? Which information is most Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
. 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.
What is a biofilm?
a. a movie about biology b. a slimy covering around a bacterium that allows it to stick to surfaces c. a colony of prokaryotes and eukaryotes living together in a slime d. a substance put on microscope slides that allow microscopic details to be better seen e. a shiny substance that develops above an oil slick
Jaws evolved during the Silurian period by modification of _____ in a jawless ancestor
1.the cartilaginous skeleton 2.the second pair of gill arches 3.gill slit support structures 4.the spiracle