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TLS Online TPP Program

#Question id: 13177

Deserts typically occur in a band at 30 degrees north and south latitude because

#Unit 10. Ecological Principles
  1. Descending air masses tend to be cool  and dry.
  2. Trade winds have a little moisture.
  3. Water is heavier than air and is not carried far over land.
  4. Ascending air tends to be moist.
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TLS Online TPP Program

#Question id: 4352

#Unit 3. Fundamental Processes

How does extracellular glucose inhibit transcription of the lac operon?
TLS Online TPP Program

#Question id: 12056

#Unit 7. System Physiology – Animal

A 68-year-old woman with hematemesis has heartburn and stomach pain. Endoscopy shows inflammation involving the gastric body and antrum as well as a small gastric ulcer. Biopsies were positive for Helicobacter pylori. H. pylori damages the gastric mucosa primarily by increasing mucosal levels of which substance?
TLS Online TPP Program

#Question id: 2003

#Unit 4. Cell Communication and Cell Signaling

The number of MHC protein combinations possible in a given population is enormous. However, an individual in that population has only a couple of MHC possibilities. Why?
TLS Online TPP Program

#Question id: 11266

#Unit 10. Ecological Principles

Which of the following options lists ecosystems in increasing order of consumption efficiency of herbivore?
TLS Online TPP Program

#Question id: 11162

#Unit 9. Diversity of Life Forms

Which statement represents the best explanation for the observation that the nuclear DNA of wolves and domestic dogs has a very high degree of homology?