Density-dependent factors affect population size in relation to the population’s density.

Density-dependent factors down into two categories. 

Negative density dependence 

Positive density dependence (inverse density dependence

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#Unit 7. System Physiology – Animal

ACTH stimulates the synthesis and secretion of cortisol by the activation of adenylyl cyclase via Gs.

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#Unit 13. Methods in Biology

Standard Deviation:

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#Unit 8. Inheritance Biology

Chromosome mutation - Difference from the wild type in the number or structure. 

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#Unit 3. Fundamental Processes

AT base pairs called the DNA unwinding element (DUE).

IHF (integration host factor) and FIS (factor for inversion stimulation). These two proteins were discovered as required components of certain recombination reactions.

Another DNA-binding protein, HU (a histone like bacterial protein originally dubbed factor U), also participates but does not have a specific binding site.

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#Unit 10. Ecological Principles

Upwelling zones (where nutrients reach the surface from deeper waters) and continental shelf areas (where bottom sediments in shallow water rapidly exchange nutrients with surface waters) support greater production.

Freshwater production is highest in rivers, shallow lakes, and ponds, where nutrients are most abundant, and lowest in clear streams and deep lakes.