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TLS Online TPP Program

#Question id: 12463

Which of the following is primarily responsible for limiting the number of trophic levels in most ecosystems? 

#Unit 10. Ecological Principles
  1. Many primary and higher-order consumers are opportunistic feeders.
  2. Decomposers compete with higher-order consumers for nutrients and energy. 
  3. Nutrient cycles involve both abiotic and biotic components of ecosystems.
  4. Energy transfer between tropic levels is in almost all cases less than 20% efficient.
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TLS Online TPP Program

#Question id: 14500

#Unit 13. Methods in Biology

A fair die is tossed 180 times. The expected number of sixes is
TLS Online TPP Program

#Question id: 1961

#Unit 4. Cell Communication and Cell Signaling

Which action below is affected by an antihistamine?
TLS Online TPP Program

#Question id: 15303

#Unit 4. Cell Communication and Cell Signaling

Neurofibromatosis, a benign tumor of the sheath cells that surround nerves, is caused by
a.  Loss of both alleles of NF1
b.  Mutation in RAS GAP-type protein
c.  A single mutant NF1 allele
d.  Mutation in SRC protein
TLS Online TPP Program

#Question id: 10198

#Unit 6. System Physiology – Plant

The response of photosynthesis to light in a C3 plant some given effect shows in dark as well as in the light, which of the following effect is not true?
TLS Online TPP Program

#Question id: 13168

#Unit 10. Ecological Principles

Use the following diagram from the text showing the spread of the cattle egret, Bulbulcus ibis, since its arrival in the New World, to answer the following question.


How would an ecologist likely explain the expansion of the cattle egret?