Atomic radii: The atomic radii of an atom depends on its position in the periodic table.

We can never determine the atomic radius of an atom because there is never a zero probability of finding an electron, and thus never a distinct boundary to the atom.

All that we can measure is the distance between two nuclei (internuclear distance).

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#Id: 9180

#Unit 11. Evolution and Behavior

Average fitness

In a species, only 1 of every 1000 seeds survives to reproductive age, and that those that survive produce an average of 3000 seeds. 

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#Id: 87

#Unit 5. Developmental Biology

Cell Specification

cells become specified to a specific fate

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#Id: 5758

#Unit 10. Ecological Principles

Principle of species individuality

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#Id: 9887

#Unit 4. Cell Communication and Cell Signaling

Eat me” signals

Dying cells facilitate their own phagocytosis by expressing on their surfaces such as phosphatidyl serine and lysophosphatidyl choline, proteins (annexin I), and altered carbohydrates. 

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#Id: 611

#Unit 2. Cellular Organization

The answer probably lies in the fact that repression of the trp operon is weak—much weaker.