By Peter J. Russell
<P style="MARGIN: 0px">With its sleek bankruptcy association and new “Focus on Genomics” bins, iGenetics: A Molecular technique MasteringGenetics, 3/e, reflects the expanding molecular emphasis in today’s experimental examine of genes whereas helping you increase problem-solving talents and an appreciation for traditional experiments. even though molecular themes are offered first, teachers can assign the chapters in any sequence.
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<P style="MARGIN: 0px">Pedagogical positive aspects akin to chapter-opening “Key Questions” and strategically positioned “Keynotes” help you to successfully grasp genetic innovations. <P style="MARGIN: 0px"> <P style="MARGIN: 0px">
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Extra resources for iGenetics: A Molecular Approach Plus MasteringGenetics with eText -- Access Card Package (3rd Edition)
However, when the DNA and RNA mixture was treated with deoxyribonuclease (DNase) and then added to living IIR bacteria, no IIIS transformants resulted. ) Chapter 2 DNA: The Genetic Material Treat with RNase Mixture of DNA and RNA from IIIS bacteria IIIS transformants produced Only DNA remains Treat with DNase Mixture of DNA and RNA from IIIS bacteria Plate on growth medium Add DNA to IIR bacteria Plate on growth medium Add RNA to IIR bacteria No IIIS transformants Only RNA remains enzymes were tested, but they might have been digested accidentally when DNases were tested.
23b). In cross section, the loops would be seen to radiate out from the center like the petals of a flower. Overall, this packing produces a chromosome that is about 10,000 times shorter, and about 400 times thicker, than naked DNA. 21a). 21b). Another, more recent, model proposes that the 30-nm fiber is an irregular zigzag of nucleosomes. Chromatin packing beyond the 30-nm chromatin filaments is less well understood. 22). The photos show 30–90-kb loops of DNA attached to a protein “scaffold” with the characteristic X shape of the paired sister chromatids.
RNA as Viral Genetic Material All organisms and many viruses discussed in this book (such as a human, Drosophila, yeast, E. coli, and bacteriophage T2) have DNA as their genetic material. However, some bacteriophages (for example, MS2 and Q b ), a number of animal viruses (for instance, poliovirus and human immunodeficiency virus, HIV), and a number of plant viruses (such as tobacco mosaic virus and barley yellow dwarf virus) have RNA as their genetic material. No known prokaryotic or eukaryotic organism has RNA as its genetic material.