The side view cross-section shows how the ribosome intersubunit tunnel aligns with the PCC donut hole. The dashed-line indicates the export passageway for new proteins. The uniformity of the earth's life, more astonishing than its diversity, is accountable by the high probability that we derived, originally, from a single cell.
All cells come from cells.
It's a basic proposition of life. A cell is so small that not until 300 years ago, with the invention of light microscopes, did we learn there was such a thing. In the 1940s, a new tool, the electron microscope, gave scientists their first look at the details of structure within the cell. Since then biologists have pieced together a basic map of the intracellular world, one of the most essential components of whi ch is ribosomes, the miniature factories that build new proteins. All rights reserved.