TLS Online TPP Program

#Question id: 1856


Influenza vaccines usually contain antigens from how many different strains of influenza virus?

#Unit 4. Cell Communication and Cell Signaling
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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?

TLS Online TPP Program

#Question id: 1220

#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 a coupled G protein most likely interact with this receptor?

TLS Online TPP Program

#Question id: 1221

#Unit 4. Cell Communication and Cell Signaling

If an animal cell suddenly lost the ability to produce GTP, what might happen to its signaling system?

TLS Online TPP Program

#Question id: 1222

#Unit 4. Cell Communication and Cell Signaling

Particular receptor tyrosine kinases (RTKs) that promote excessive cell division are found at high levels in various cancer cells. HER2 is an RTK that is present at excessively high levels in some breast cancer cells. Herceptin is a protein that binds to HER2 and inhibits cell division. Herceptin may be an effective treatment for breast cancer treatment under which of the following conditions?