Which of the following contribute to maintaining the high osmolarity of the renal medulla?

I) active transport of salt from the upper region of the ascending limb

II) the spatial arrangement of juxtamedullary nephrons

III) diffusion of urea from the collecting duct

IV) diffusion of salt from the descending limb of the loop of Henle

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#Question id: 17279

#Unit 13. Methods in Biology

Which of the following is relatively more stable to heat

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#Question id: 4658

#Unit 11. Evolution and Behavior

Members of two different species possess a similar-looking structure that they use in a similar fashion to perform the same function. Which information would best help distinguish between an explanation based on homology versus one based on convergent evolution?

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#Question id: 9160

#Unit 9. Diversity of Life Forms

Generally speaking, deserts are located in places where air masses are usually ________.

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#Question id: 3640

#Unit 3. Fundamental Processes

Which of the following is true for the mechanism of excision repair?

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#Question id: 45

#Unit 1. Molecules and their Interaction Relevant to Biology

What is the standard free-energy change, ΔG°, under physiological conditions (E. coli grows in the human gut, at 37 °C) for the following reaction? (Keq = 7.8 × 10^2)

Glucose + ATP → glucose 6-phosphate + ADP