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stich3 [128]
3 years ago
7

Secondly, explain why energy is not just provided by the simple hydrolysis of ATP.

Biology
1 answer:
Nataliya [291]3 years ago
6 0

Answer:

The exergonic reaction of hydrolysis of ATP must be coupled to an endergonic reaction to perform work or to power other reactions.

Explanation:

ATP (adenosin triphosphate) is hydrolized to give ADP and releases energy as follows:

ATP + H₂O ⇆ ADP + Pi + energy

The released energy itself is not used to power biochemical reaction. In order to power other reactions, ATP hydrolysis- a energetically favorable reaction- is coupled to another energetically disfavorable reaction. The linking or coupling is performed through a shared intermediate, which is often a phosphorilated molecule. For example, in the formation reaction of sucrose from glucose and fructose, an intermediate is formated by the transfer of a phosphate group (Pi) provided by ATP hydrolysis. Then, the phosphorilated intermediate (glucose-Pi)- wich is unstable- reacts with fructose in a spontaneous reaction to give sucrose.

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Posted January 22

INCREASE FONT SIZE

Birding: Annual bird counts include interesting lingerers

Warmer York County especially holds a range of seasonal holdovers in the Christmas Bird Counts.

BY HERB WILSON

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The 117th Christmas Bird Count is now over. As usual in January, I will discuss the highlights of some of the Maine counts. These standardized censuses provide an important tool to monitor the abundance of winter birds throughout North America and beyond.

I’ll concentrate on changes in regularly wintering birds, the arrival of unpredictable invaders and records of lingering birds whose wintering areas are well to our south. A rarity or two may pop up as well.

We’ll start with the southern Maine coast. The York County count was held on Dec. 21. Thirty observers found 82 species of birds.

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