the stage of the cell cycle during which the cell's nucleus divides into two new nuclei and one copy of the DNA is distributed into each daughter cell.
b. a transmission electron microscope, because it has high resolution
A scanning electron microscope would be the best choice for a scientist examining the living cells lining the respiratory tract. This is due to its capability of scanning the surface of the whole cells, which is essential to properly observe the tiny hairs on these cells that move dirt and mucus away from the lungs.
To explore living cells lining the respiratory tract, the best instrument would likely be a scanning electron microscope (SEM). While both SEM and transmission electron microscopes provide high-resolution images, a key difference is how they interact with the specimen. The SEM scans the surface of whole cells, making it ideal for observing the tiny hairs, or cilia, on the cells of the respiratory tract. These tiny hairs move in coordinated waves, pushing mucus and trapped particles out of our lungs. This process can be best observed on the whole cell surface, which is why SEM would be preferred.
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