Transformation in Process

This electron micrograph (courtesy of Dr. Alexander Tomasz) shows a DNA molecule entering a pneumococcus (the large object at the top). This DNA molecule — only a portion of which (scroll down) is shown here — is approximately 7 micrometers (µm) in length, long enough to include a dozen genes. The process of transformation follows the uptake of such a molecule by the bacterium. [More]

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16 May 2011