By Rob Phillips, Jane Kondev, Julie Theriot, Hernan Garcia
Physical Biology of the Cell is a textbook for a primary direction in actual biology or biophysics for undergraduate or graduate scholars. It maps the large and complicated panorama of phone and molecular biology from the distinctive standpoint of actual biology. As a key organizing precept, the proximity of themes relies at the actual thoughts that unite a given set of organic phenomena. Herein lies the imperative premise: that the fitting software of some basic actual types can function the basis of entire our bodies of quantitative organic instinct, precious throughout quite a lot of organic difficulties. the second one variation positive factors full-color illustrations all through, new chapters, a considerably accelerated set of end-of-chapter difficulties, and comes in quite a few booklet codecs.
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Extra resources for Physical Biology of the Cell (2nd Edition)
Sample text
The mechanistic basis of these data is that a certain protein (Lac repressor) binds simultaneously at two sites on the DNA and forms a loop of the DNA between the two binding sites. When the Lac repressor protein is bound to the DNA, it prevents the binding of the protein machine that copies the DNA into RNA. The strength of this effect (repression) can be measured quantitatively. The experimental data show that the amount of repression depends in a complex way on the precise distance between the two binding sites.
An example of a complete sentence in the protein language is a fully folded, compact, biologically active enzyme that is capable of catalyzing a specific biochemical reaction within a living cell. Much of the rest of the book will be built around developing models of a host of biological processes in cells that appeal to the macromolecular underpinnings described here. The sequences associated with nucleic acids and proteins are linked mechanistically through the ribosome, which takes nucleic acid sequences (in the form of messenger RNA (mRNA)) and converts them into amino acid sequences (in the form of proteins).
In these simple models, the physical differences between hydrophobic and polar amino acids (that is, those that are like oil versus those that are like water) affect the nature of their interactions with water molecules as well as with each other and thereby dictate the ways that the amino acid chain can fold up to make the functional protein. Similarly, we can think of the three-dimensional folded structure of proteins at different levels of abstraction depending on the question under consideration.