TLS Online TPP Program

#Question id: 26938


Which of the following statements is the most appropriate to define character displacement?

#Unit 10. Ecological Principles
  1. Two related species depending on the same prey species avoid competition by feeding at different times of the day.
  2. The body sizes of two related species are very similar when they are allopatric but in geographical areas of sympatric, one species is significantly smaller than the other
  3. The food niche of a species is generally wider in the absence of competing species than in their presence.
  4.  Closely related species can coexist if their densities are regulated by a predator
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TLS Online TPP Program

#Question id: 1214

#Unit 4. Cell Communication and Cell Signaling

A mutation in the FAK gene would likely result in:

TLS Online TPP Program

#Question id: 1215

#Unit 4. Cell Communication and Cell Signaling

A cell responds to an external stimulus by increasing the intracellular Ca2+ concentration, releasing IP3 from the membrane, and producing salicylic acid. What kind of cell does this describe?

TLS Online TPP Program

#Question id: 1216

#Unit 4. Cell Communication and Cell Signaling

In yeast signal transduction, a yeast cell releases a mating factor, which:

TLS Online TPP Program

#Question id: 1217

#Unit 4. Cell Communication and Cell Signaling

Yeast cells of mating type a are genetically engineered to produce only mating factor α instead of the normal mating factor a. The gene for the mating factor receptor was unaltered. How will these engineered cells behave in terms of mating?

TLS Online TPP Program

#Question id: 1218

#Unit 4. Cell Communication and Cell Signaling

Hormones are chemical substances produced in one organ that are released into the bloodstream and affect the function of a target organ. Which of the following conditions is required for the target organ to respond to a particular hormone?

TLS Online TPP Program

#Question id: 1219

#Unit 4. Cell Communication and Cell Signaling

Many G protein-coupled receptors contain seven transmembrane α-helical domains. The amino end of the protein lies at the exterior of the plasma membrane. Loops of amino acids connect the helices either at the exterior surface or on the cytosolic surface of the membrane. The loop on the cytosolic side between helices 5 and 6 is usually substantially longer than the others. Where would you expect to find the carboxyl end of the protein?