Answer:
The nucleus at the central part of the cheek cell contains DNA. When a drop of methylene blue is introduced, the nucleus is stained, which makes it stand out and be clearly seen under the microscope.
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Polarity of a molecule does not involve the symmetry of the molecule rather it deals on with the presence of net charges and partial charges. It would be due to the partial charges present in the <span>single myosin molecules that causes its polarity. Hope this helps. Have a nice day.</span>
do all bacterial cells have the same structures? no
sodium-potassium pump. n. The enzyme-based mechanism that maintains correct cellular concentrations of sodium and potassium ions by removing excess ions from inside a cell and replacing them with ions from outside the cell.