At which temperature does the excitation of the thermoreceptors begin to cause pain?

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#Question id: 4340

#Unit 3. Fundamental Processes

There is a mutation that is found in E. coli in the repressor that results in a molecule known as a super-repressor because it represses the lac operon permanently. Which of the following characteristics would you expect to observe in such a mutant?

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#Question id: 1910

#Unit 4. Cell Communication and Cell Signaling

Hyperacute graft rejection is caused by:

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#Question id: 10339

#Unit 6. System Physiology – Plant

Nitrate assimilates into the root where the conversion of nitrate to nitrite in the cytosol, a reduction reaction that involves the transfer of two electrons catalyzes by an enzyme that is NAD(P)H dependent is known as

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#Question id: 16789

#Unit 13. Methods in Biology

The median of number 50, 48, 47, 48.5, 50.5, 52, 48.8, 46 will be: 

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#Question id: 12602

#Unit 10. Ecological Principles

Aquatic primary productivity is most limited by which of the following?