In deep water, which of the following abiotic factors would most limit primary productivity?

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#Question id: 15602

#Unit 12. Applied Biology

The antibiotic erythromycin, the immunosuppressive drug FK506, and the cholesterol-lowering drug lovastatin all belong to which class.

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#Question id: 23752

#General Aptitude

Which one of the following is always associated with a 'tree'?

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#Question id: 3278

#Unit 11. Evolution and Behavior

What does the biological species concept use as the primary criterion for determining species boundaries?

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#Question id: 15768

#Unit 5. Developmental Biology

A stem cell has the power to produce many different types of differentiated cells. This phenomenon is known as

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#Question id: 1401

#Unit 4. Cell Communication and Cell Signaling

Which of the following are proto-oncogenes?

a. fos               b. myc             c. p53              d. ras               e. Rb