By David M. Prescott (Eds.)

ISBN-10: 0122895029

ISBN-13: 9780122895029

ISBN-10: 0323147798

ISBN-13: 9780323147798

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Additional resources for Cell Biology: A Comprehensive Treatise. The Structure and Replication of Genetic Material

Example text

Coli by λ can have two different outcomes (see review by Herskowitz, 1973). The first, called the lytic response, is devoted to the multiplication of the bacteriophage and results in lysis of the cell with the release of about 100 new phage particles. The second, called the lysogenic response, results in the covalent integration of the λ genome into the E. coli chromosome where it can remain stably associated as a prophage for many cell generations. Much about these two responses can be explained by what is known about the transcription of the various λ operons.

These heteroduplex molecules contain regions of double-stranded DNA in which the two par­ ents have homologous sequences and loops or bubbles of single-stranded DNA in which the parental sequences are nonhomologous (see, for exam­ ple, Figure 9). The lengths of the single- and double-stranded regions can be measured, and by comparing the regions of homology and nonhomology with the genetic properties of the parental DNA's, it is possible to determine the physical positions of the genes on the parent molecules.

This interaction is mediated by the product of λ gene A. , 1975). , 1972). This suggests that the right end of the λ DNA is always packaged nearest the tail. Further evidence for polarity in the packaging process comes from a more detailed examination of substrates for the in vitro packaging reaction. In this reaction, a λ DNA molecule with another partial λ DNA joined to the left end is packaged far more efficiently than a λ DNA with another partial λ DNA joined to the left end (Syvanen, 1975).

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Cell Biology: A Comprehensive Treatise. The Structure and Replication of Genetic Material by David M. Prescott (Eds.)


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