. Biophysics: concepts and mechanisms. Biophysics. 152 BIG MOLECULES here; chemical condensations and osmotic pressures, changed as the nuclear membrane disappears and the fluid of the cytoplasm enters, are other candidates. The forces seem to be too long-range to be electrical in nature. The essential feature of the replication of the "code" or specification for the animal seems to be the reproduction of the DNA itself. It is now siir- mised that this is a cooperative action of four molecular parts: (a) one of the uncoiled DNA helices, (b) an enzyme, on which has been absorbed (c) t
. Biophysics: concepts and mechanisms. Biophysics. 152 BIG MOLECULES here; chemical condensations and osmotic pressures, changed as the nuclear membrane disappears and the fluid of the cytoplasm enters, are other candidates. The forces seem to be too long-range to be electrical in nature. The essential feature of the replication of the "code" or specification for the animal seems to be the reproduction of the DNA itself. It is now siir- mised that this is a cooperative action of four molecular parts: (a) one of the uncoiled DNA helices, (b) an enzyme, on which has been absorbed (c) the energy carrier, ATP, and (d) the basic polyacid which is to be "stamped" onto (or better: is to condense with) the DNA at the proper spot on the chain. This "enzyme" may be nothing more than one of the proteins syn- thesized already through RNA; it may have a series of "active sites" when uncoiled, one for each of the polyacids which is to be stamped onto the DNA helix. Thus, at least in principle, the replication process and protein synthesis have many features in common: Replication: DNA + enzyme + ATP -f basic polyacids Protein Synthesis: RNA + enzyme + ATP + aminoacids The key or code for both is carried by DNA, and thence RNA; and some- times by RNA •;*-% '.::- .'' \.$» #* .... Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Casey, Edmund Jeremiah, 1924-. New York, Reinhold Pub. Corp
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