Counter-clockwise rotation starting at 0º gives negative dihedral angles from -1º through

90º ending at -180º (the same dihedral angle  as +180º).

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#Id: 9570

#Unit 11. Evolution and Behavior

Van Valen law -  he found a surprising result: rather straight curves, implying that the probability of extinction is roughly constant.

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#Id: 7556

#Unit 6. System Physiology – Plant

Cytokinins are defined as compounds that have biological activities similar to those of trans-zeatin. These activities include the ability to do the following:

Induce cell division in callus cells in the presence of an auxin

Promote bud or root formation from callus cultures when in the appropriate molar ratios to auxin

Delay senescence of leaves

Promote expansion of dicot cotyledons

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#Id: 10490

#Unit 4. Cell Communication and Cell Signaling

perforins punch holes in the endocytic vesicle membrane, allowing granzymes to enter the cytoplasm

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#Id: 9140

#Unit 10. Ecological Principles

Brood parasitism is a specific kind of kleptoparasitism in which individuals manipulate others to feed and look after their young.

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#Id: 1964

#Unit 10. Ecological Principles

A static life table accomplishes the same goal, but instead of following a cohort of individuals from life to death, data is gathered on the age structure of a given population at one point in time.