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kifflom [539]
3 years ago
14

In two or more complete sentences describe how a dam placed in a river can act as both a constructive and destructive force.

Biology
2 answers:
FromTheMoon [43]3 years ago
8 0
The good thing about a dam is that electricity can be created by mechanical means. That does not affect the atmosphere. Storing such production is a different matter.

The bad thing about a dam is that it wreaks havoc on the land where the water is stored behind the dam.

vodomira [7]3 years ago
4 0

Answer:

<u>Dams are constructed over the narrow valleys and it acts like a barrier that obstructs the water from the flow</u>. There are both advantages as well as disadvantages in constructing a dam.

Some of the constructive force or advantages of dams are as follows-

1) It generates electricity .

2) It is often used for irrigation and industrial purposes.

3) it is used for farming purposes in water such as raising as well as harvesting of fishes and other aquatic plants.

Some disadvantages are-

1) It degrades water quality.

2) Aquatic organisms are affected thereby harming the ecosystem.

3) It obstructs the flow of water.

4) Failure of a dam causes flood.

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Starch, cellulose, dextran, and glycogen are polysaccharides. How are they similar? To what are their different properties due?
daser333 [38]

Answer:

similarity

Starch, cellulose,dextran and glycogen are all polymers of glucose

differences

                monomer/glucose     glycosidic bond    branching

1.starch              α glucose          1-4 and 1-6               branch and unbranced

  amylose                                       1-4                          unbranched

  amylopectin                               1-4 and 1-6              branched

2. dextran          α glucose          1-6                           branched

3. cellulose        β glucose           1-4                          unbranched, linear        

4. glycogen       α glucose           1-4 and 1-6              branched (shorter

                                                                                     branches than starch)

Enzyme: amlase acts on starch and cellulase acts on cellulose as they are specific for their substrates.

Explanation:

Starch: Consists of both branched amylopectin and unbranched amylose

Enzymes: Enzymes are specific as the gulcose molecule in starch is α and in cellulose is β which differ in their position of hydroxyl groups at anomeric carbon, their structures differ so they form different bonds. Active sites of enzymes can act only on specific bonds a sthey can fit to their specific substrates.

3 0
3 years ago
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