Gilbertson Et Al

question 15

Multiple Choice

Gilbertson et al. (2002) found that Vietnam veterans who had developed PTSD and which other group both had reduced hippocampal volumes relative to controls, suggesting that the small hippocampus made the PTSD patients more vulnerable to the disorder?

• A)London taxi drivers
• B)Unexposed twins
• C)World War II veterans
• D)Their spouses
• E)Their children

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Definitions:

Ammonification

The conversion of nitrogen-containing organic compounds to ammonia (NH3) by certain soil bacteria (ammonifying bacteria); part of the nitrogen cycle.

Nitrogen Fixation

The conversion of atmospheric nitrogen (N2) to ammonia (NH3) by certain bacteria; part of the nitrogen cycle.

Ecological Pyramids

Graphical representations showing the relative amounts of energy or matter contained within each trophic level in a given ecosystem.

Pyramid of Numbers

A graphical representation showing the number of organisms at different trophic levels in an ecosystem, typically decreasing from producers to top predators.