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ryzh [129]
3 years ago
13

Why can the enzyme maltase, which breaks down into the sugar maltose, not also be used to break down the sugar sucrose?

Biology
1 answer:
Fed [463]3 years ago
8 0

The enzyme maltase breaks down disaccharide maltose into simple sugar glucose, which is usable by the body. This glucose can now also be stored in the liver for future use.

This maltase does nor break down sugar sucrose because it is the sucrase enzyme that breaks down sucrose into glucose and fructose.

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What happens to a ecosystems food chain if the concentration pollutants move up.
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</span>A <span>food web </span>is a diagram displaying how all the producers, decomposers and primary and secondary consumers interact in an ecosystem.  It shows how energy is transferred between species. 

A food web can be very simple - with one producer, consumer and decomposer- or a food web can be extremely complicated.  A food web of an entire woodland ecosystem becomes complex when you include every species from plants to insects and mammals. 


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Sometimes animals ingest pollutants that can become stored in their fat and tissues.  Human-caused pollution has added heavy metals, oil, and <span>industrial and pharmaceutical chemicals </span>to the environment.  Plants, fish and other species absorb these toxins, and as they are eaten by predators, the toxins are then absorbed into the predators’ tissues.  As the chain of predator and prey continues up the food web the toxins become more concentrated and move higher and higher up the food web.  The pollutants can have a disastrous effect on the food web and potentially kill species.


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To explain the true impacts of chemicals on the food web, we’re going to use the real world example of mercury poisoning. 

Coal-fired power plants burn coal and release mercury into the atmosphere as a byproduct.  Over time, mercury falls to Earth through rain, snow and natural settling.  Rain carries the mercury to streams and rivers and it eventually settles in lakes and ponds. 

After mercury enters lakes and ponds, bacteria transform mercury into a more easily absorbed toxic substance called methylmercury.  Aquatic plants, bacteria and plankton absorb methylmercury from the surrounding water. 

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Magnifying Up the Food Web 
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Study the diagram to see how mercury bioaccumulates up this common food web. 

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