Chickadees were given an opportunity to store seeds in 72 possible storage sites consisting of holes drilled in small trees that had been placed in an aviary. Typically, the seeds were placed in only 4 or 5 storage sites. The chickadees were then removed from the aviary, the seeds removed from the storage sites, and each hole covered. A day later, the chickadees were returned to the aviary and they spent nearly 5 times as long pulling at the covers on storage sites than at the covers on sites where they had not stored food. This experiment indicates that chickadees

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#Question id: 19524

#Unit 12. Applied Biology

In the DNA-protein complex where central DNA core is surrounded by the N-terminal half of the Cry protein, while the C-terminal half of the protein 

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#Question id: 11128

#Unit 7. System Physiology – Animal

Inhibition of pain signals by tactile stimulation of a skin surface involves which of the following selections?

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#Question id: 4153

#Unit 3. Fundamental Processes

Ubiquitin-mediated protein degradation is a complex process, and many of the signals remain unknown.  One known signal involves recognition of amino acids in a processed protein that are either stabilizing (Ala, Gly, Met, Ser, etc.) or destabilizing (Arg, Asp, Leu, Lys, Phe, etc.), and are located at:

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#Question id: 1711

#Unit 4. Cell Communication and Cell Signaling

On entering a germinal center, the primary B-blasts grow exponentially to form which cell type in the dark zone?

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#Question id: 22939

#Unit 5. Developmental Biology

CO gene expression appears to be highest in the companion cells of the phloem of leaves and stems, the downstream target gene of CONSTANS is