The N-terminal half of phytochrome contains three types of domain, which of the following contain bilin-lyase activity, which binds the chromophore?

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#Question id: 24195

#Aptitude

Many animals hibernate during parts of the year, entering a state that is similar to a very deep sleep. But hibernation is more than simply a deep sleep. The animal’s body temperature drops well below its normal range, the animal does not wake up for a long period of time, and its metabolism slows to the point that the animal does not need to eat or relieve itself during that period.

In order to prepare for hibernation, the animal must build up its body weight and increase its body fat. This is important, since the animal will be living off its own body fat during the months of hibernation. Of course, once the period of hibernation is over, the animal “wakes up” to find itself slim and trim once again!

How does an animal prepare for hibernation?

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#Question id: 4961

#11. Evolution and Behavior

An early consequence of the release of oxygen gas by plant and bacterial photosynthesis was to

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#Question id: 1091

#4. Cell Communication and Cell Signaling

Why does testosterone, a lipid-soluble signaling molecule that crosses the membranes of all cells, affect only target cells?

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#Question id: 10959

#7. System Physiology – Animal

 Which of the following would best explain a prolonged bleeding time test?

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#Question id: 11971

#7. System Physiology – Animal

Over-the-counter medications for acid reflux or heartburn block the production of stomach acid. Which of the following cells are directly affected by this medication?