During gastrulation in the frog, the very first cells to move into the interior of the embryo through the blastopore come from the surface layer of cells in the marginal zone; they will become:

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#Question id: 4323

#Unit 3. Fundamental Processes

Muscle cells differ from nerve cells mainly because they

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#Question id: 11919

#Unit 10. Ecological Principles

Frequent disturbances could lead to failure of a community to reach a climax community as one seral stage keeps replacing itself, a condition known as

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#Question id: 19365

#Unit 13. Methods in Biology

Which vectors carry the longest foreign DNA fragments?

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#Question id: 4675

#Unit 3. Fundamental Processes

Which of the following repressor work as both activate as well as repress transcription ?

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#Question id: 15478

#Unit 12. Applied Biology

Escherichia coli preferentially utilizes glucose by preventing the uptake of lactose and switching off transcription of the lac operon. This mechanism is known as