Which one of the following can send electrical impulses into the body to reduce pain?

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#Question id: 7154

#Unit 5. Developmental Biology

Cancer is believed to often arise from stem cells, rather than fully differentiated cells. Which of the following are consistent with this view?

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#Question id: 7194

#Unit 5. Developmental Biology

Formation of digits and sculpting the tetrapod limb requires death of specific cells in the limb in a programmed manner. Which one of the following interactions could explain proper limb formation?

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#Question id: 31379

#Unit 5. Developmental Biology

The cadherin catenin complex is extremely important during compaction from a morula to the blastula. Transition of early embryonic cells into a blastula differed depending on the presence or absence of calcium ions. In addition, an investigator blocked the expression of β-catenin using vivo morpholinos to detect its effect simultaneously on compaction. Which one of the following conditions will lead to the most successful transition of the morula into the blastula?

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#Question id: 32155

#Unit 1. Molecules and their Interaction Relevant to Biology

pKa values for ring nitrogen atoms 1 and 3 in uracil are 

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#Question id: 1292

#Unit 4. Cell Communication and Cell Signaling

Heparan sulfate, an example of a(n) _____________, aids in the activation of ____________.