Protein structural motifs often have general functions in common.  Which one of the following motifs is known to be involved in protein dimer formation, but not in direct protein-DNA interactions?

TLS Online TPP Program

#Question id: 9243

#SCPH28 | Zoology

Elevated carbon dioxide levels have been shown to contribute to the greenhouse effect, resulting in an increase in mean global temperature. Ecosystems where the largest warming has already occurred include snow-covered northern coniferous forests, tundra, and arctic sea ice habitats. Which statement best explains how the elimination of ice-covered ecosystems affects the rise or fall in global temperature?

TLS Online TPP Program

#Question id: 9244

#SCPH28 | Zoology

One characteristic that distinguishes a population in an extinction vortex from most other populations is that

TLS Online TPP Program

#Question id: 9251

#SCPH28 | Zoology

Which of the following is responsible for the differences in summer and winter temperature stratification of deep temperate zone lakes?

TLS Online TPP Program

#Question id: 9252

#SCPH28 | Zoology

Which of these environmental factor(s) is/are the key determining factor(s) that control(s) the biotic structure of aquatic biomes?

TLS Online TPP Program

#Question id: 9253

#SCPH28 | Zoology

A certain species of pine tree survives only in scattered locations at elevations above 2,800 meters 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: 9254

#SCPH28 | Zoology

Organisms evolve over generations to become adapted to the environmental conditions to which they are exposed. The diversity of organisms that

occurs in any particular area thus may be largely determined by the abiotic factors limiting survivorship and reproduction of organisms in a region. Which of the following limit the range of Saguaro cactus in North America?

I) pollinators

II) sunlight

III) precipitation

IV) temperature