HIV transcribes its genes from a promoter controlled by P-TEFb, P-TEFb is brought to the stalled polymerase by an RNA-binding protein, not a DNA-bound one. The protein responsible is called

TLS Online TPP Program

#Question id: 12015

#Unit 10. Ecological Principles

The oxygen consumption of marine crabs acclimated to either 10°C or 20°C was measured at environmental temperatures of 5°C to 25°C to produce the following graph.

Which of the following can be correctly concluded from the information in the graph?

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#Question id: 12016

#Unit 10. Ecological Principles

The ability of a desert rodent's kidneys to form highly concentrated urine is largely attributable to

TLS Online TPP Program

#Question id: 12017

#Unit 10. Ecological Principles

All of the following allow hermaphroditic animal species to avoid inbreeding EXCEPT

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#Question id: 12018

#Unit 10. Ecological Principles

The amount of energy entering a food chain depends on the

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#Question id: 12019

#Unit 10. Ecological Principles

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: 12020

#Unit 10. Ecological Principles

Bird species X stores seeds in a large number of separate caches in the summer and then locates the caches in the winter. Compared with a bird species that does not store seeds, species X can be expected to have a proportionately larger