Matrix-associated regions (MARs) may be identified by characterizing the DNA retained by the matrix isolated in vivo (left) or by identifying the fragments that can bind to the matrix from which all DNA has been removed (right).

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#Id: 2151

#Unit 9. Diversity of Life Forms

Only four possible states of a particular site in a DNA sequence. A single base pair difference among species provides little reliable evidence about their phylogeny

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#Id: 8001

#Unit 10. Ecological Principles

Overlapping of fundamental niche

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#Id: 3648

#Unit 3. Fundamental Processes

In ValRS, the side chain of Asp 279 protrudes into the editing active site, where it hydrogen-bonds with the hydroxyl group of threonine. The isosteric (having the same shape) valine lacks this hydroxyl group and is thereby excluded from the editing pocket.

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#Id: 421

#Unit 2. Cellular Organization

The nucleosome is 200 bp of DNA, organized by an octamer of small, basic histone proteins into a beadlike structure. 

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#Id: 7852

#Unit 1. Molecules and their Interaction Relevant to Biology

The pyranose forms of the sugars are more stable than the furanose forms in solution.