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The heart has 4 valves. Explain how one of them works. (NO PLAGIARISM PLEASE (20 points)
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Biology, 21.06.2019 20:00
You have been asked to lead a demonstration for the undergraduate microbiology lab course about the uses of negative staining when studying bacteria. a "negative" stain does not stain the bacterial cell itself but stains the space between cells. under magnification, the acidic (negativelycharged) nature of the stain will be repelled by the negatively charged bacterial cell wall and willleave the cell colorless in a stained background. negative stains are used primarily to reveal the presence of negatively charged bacterial capsules; therefore, they are also called capsule stains. encapsulated cells appear to have a halo surrounding them. the negative stain procedure does not require heat fixation, which limits any chances of alteration in bacterial cell shape and size. the bacterial suspension is added to a drop of stain, such as nigrosin or eosin, and drawn across the glass slide using a coverslip.nigrosin staining-not safranin staining-of klebsiella pneumoniae will allow for the visualization of the cell shape and the determination of the presence of a capsule.true/false
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Biology, 22.06.2019 10:00
In what part of the body does the most muscle activity happen?
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Biology, 22.06.2019 14:40
In general, characteristics that an organism survive and reproduce become more common in a population over time. what mechanism of evolution cause this change?
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The heart has 4 valves. Explain how one of them works.
(NO PLAGIARISM PLEASE (20 points)...
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