Match the transcriptional machinery with their respective RNA Polymerase

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#Question id: 15441

#Unit 4. Cell Communication and Cell Signaling

In hermaphrodites, expression of the egl-1 gene in the neurons is repressed by the transcription factor, and deletion of that causes these neurons to undergo apoptosis;

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#Question id: 19459

#Unit 13. Methods in Biology

Phase-contrast microscopy depends on the refractive index of the region of specimen and generates image in which we see a pattern of 

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#Question id: 1370

#Unit 4. Cell Communication and Cell Signaling

H. V. Wilson worked with sponges to gain some insight into exactly what was responsible for holding adjacent cells together. He exposed two species of differently pigmented sponges to a chemical that disrupted intercellular junctions, and the cells of the sponges dissociated. Wilson then mixed the cells of the two species and removed the chemical that caused the cells to dissociate. Wilson found that the sponges reassembled into two separate species. The cells from one species did not interact or form associations with the cells of the other species.

How do you explain the results of Wilson's experiments?

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#Question id: 10995

#Unit 7. System Physiology – Animal

When recording lead III on an EKG, the negative electrode is the

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#Question id: 15778

#Unit 5. Developmental Biology

Stem cell regulation is highly influenced by the microenvironment that surrounds a stem cell and is known as the