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TLS Online TPP Program

#Question id: 1363

Which of the following statements best describes the difference between low-affinity integrins and high-affinity integrins?

#Unit 4. Cell Communication and Cell Signaling

  1. Many integrins can exist in two conformations: a low-affinity (bent) conformation and a high-affinity (straight) conformation.

  2. Dissociation of the alpha beta heterodimer converts many integrins from the low-affinity to the high-affinity state.

  3. Association of the alpha beta heterodimer converts many integrins from the low-affinity to the high-affinity state.

  4. Proteolytic cleavage of the C-terminal tails of the two subunits converts many integrins from the low-affinity to the high-affinity state.

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TLS Online TPP Program

#Question id: 24559

#Unit 4. Cell Communication and Cell Signaling

How many gene segments are exist at heavy and the light chain loci?
TLS Online TPP Program

#Question id: 4592

#Unit 11. Evolution and Behavior

Which of the following statements describe the effect of evolution on a population?
TLS Online TPP Program

#Question id: 7229

#Unit 5. Developmental Biology

Two embryos were injected with bicoid at early cleavage stage. What would be the phenotypes of the resulting embryos?
TLS Online TPP Program

#Question id: 24220

#Unit 1. Molecules and their Interaction Relevant to Biology

Glucagon stimulates cAMP from ATP. Cyclic AMP then activates cAMP-dependent protein kinase, phosphorylates PFK-2/FBPase-2. Phosphorylation of this protein enhances its FBPase-2 activity and inhibits its PFK-2 activity resulting
TLS Online TPP Program

#Question id: 23110

#Unit 2. Cellular Organization

Individual nucleosomes can be obtained by treating chromatin with the endonuclease micrococcal nuclease (MNase), which cuts the DNA between nucleosomes, a region known as