The degree of supercoiling of bacterial DNA is maintained by regulation of the net activity of topoisomerases,

TLS Online TPP Program

#Question id: 13020

#Unit 10. Ecological Principles

Experts in deer ecology generally agree that population sizes of deer that live in temperate climates are limited by winter snow. The deer congregate in ?yarding? areas under evergreen trees because venturing out to feed in winter is energetically too expensive when snowfall depths accumulate to above 40 cm. Deer often stay yarded until the spring thaw. Snow depth over 40 inches for more than 60 days results in high mortality due to starvation.  This observation best illustrates which of the following principles about factors that limit distribution of organisms?

TLS Online TPP Program

#Question id: 13021

#Unit 10. Ecological Principles

Which marine zone would have the lowest rates of primary productivity (photosynthesis)? 

TLS Online TPP Program

#Question id: 13022

#Unit 10. Ecological Principles

A certain species of pine tree survives only in scattered locations at elevations above 2,800 m in the western United States. To understand why this tree grows only in these specific places an ecologist should

TLS Online TPP Program

#Question id: 13124

#Unit 10. Ecological Principles

A recent study of ecological footprints concluded that

TLS Online TPP Program

#Question id: 13125

#Unit 10. Ecological Principles

Which of the following statements is consistent with the principle of competitive exclusion? 

TLS Online TPP Program

#Question id: 13126

#Unit 10. Ecological Principles

Which point in the graph shows -Rate of population growth is highest.