Attention to the Unseen

Jordana Cepelewicz writes: The nucleus of a cell has something in common with a cardboard box full of kittens: People get so fascinated by the contents that they overlook the container. The nucleus itself is often treated as no more than a featureless membranous bag for holding the vitally dynamic genetic material. Yet in fact it has specialized parts and an internal architecture of its own, and scientists have long speculated that precisely how the DNA positions itself with respect…

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Diana Kwon writes: Of all the organelles to be found inside eukaryotic cells, the DNA-sheltering nuclei might be the best-known, but the mitochondria are surely not far behind. Mitochondria are familiar as bean-shaped structures floating in the cytoplasm, and they are almost inevitably referred to as “powerhouses” of the cell because they generate adenosine triphosphate (ATP), the fuel for most metabolic processes. For more than a century, biologists believed that energy production was their only role. But that simple picture…

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