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TLS Online TPP Program

#Question id: 1243

One form of receptor desensitization can be mediated by negative feedback involving phosphorylation of the receptor itself by a kinase activated downstream of a second messenger. The phosphorylated receptor likely:

#Unit 4. Cell Communication and Cell Signaling

  1. would be resensitized by a kinase.

  2. would activate heterotrimeric G proteins at a faster rate.

  3. would be unable to bind ligand.

  4. could be resistant to desensitization if Ser/Thr phosphatases were acting on the same receptor.

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TLS Online TPP Program

#Question id: 342

#Unit 1. Molecules and their Interaction Relevant to Biology

In a single molecule of water, two hydrogen atoms are bonded to a single oxygen atom by ________.
TLS Online TPP Program

#Question id: 5443

#Unit 8. Inheritance Biology

Two varieties of maize averaging 25 and 125 inches in height, respectively, are crossed. The F1 progeny is quite uniform averaging 75 inches in height. Plant height is control by 3 QTL, what is the probability of plant with 25 inch height in F2 generation?
TLS Online TPP Program

#Question id: 986

#Unit 1. Molecules and their Interaction Relevant to Biology

Inhibition of ATCase by a ________ nucleotide and activation of ATCase by a ________ nucleotide keep the balance of purine and pyrimidine pools in E. coli.
TLS Online TPP Program

#Question id: 604

#Unit 1. Molecules and their Interaction Relevant to Biology

An enzyme is irreversibly inhibited by diisopropylfluorophosphate (DFP). What does this show?
TLS Online TPP Program

#Question id: 8914

#Unit 9. Diversity of Life Forms

Which of the following is (are) unique to animals?