One group of ecologists has suggested that producers are limited by competition for resources, primary consumers (herbivores) are limited by predation, and secondary consumers (carnivores) are limited by food. If this were true, at which of the following trophic levels would one expect to find substantial evidence for competitive exclusion?

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#Question id: 7494

#General Aptitude

A clock is set right at 8 a.m. The clock gains 10 minutes in 24 hours will be the true time when the clock indicates 1 p.m. on the following day?

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#Question id: 28214

#Unit 5. Developmental Biology

Specification of different mesodermal cell types in the frog Xenopus laevis by activin, a paracrine factor of the TGF-beta family. Which of the following observation is correct at the slightly lower concentration of activin?

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#Question id: 7020

#Unit 5. Developmental Biology

The pushing out of neural crest cells from the dorsal neural tube appears to be facilitated by fellow neural crest cells. The phenomenon known as:

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#Question id: 11346

#Unit 2. Cellular Organization

Which protein are anti-apoptotic?

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#Question id: 1747

#Unit 4. Cell Communication and Cell Signaling

Cytokines always act: