In designing a new drug, it must enter the cytoplasm of specific target cells in order for this drug to work. The similarity of the drug molecule to other molecules transported by the target cells can be a factor to determines whether molecules selectively enters the target cells.
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Light microscopes can be used to observe any type of object, but using an electron microscope to look at metallic objects would damage the microscope.
Light microscopes can be used to observe live specimens, but preparing a specimen for electron microscopy would kill it.
Light microscopes have much higher magnification power than electron microscopes, as long as a high resolution image is not needed.
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Toxic chemicals is a major cause of water pollution. In most cases, the toxic chemicals came from the residual from production process after companies done making their product
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