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Dvinal [7]
3 years ago
6

If a DNA molecule is compared to a spiral staircase, what parts make up the steps?

Biology
2 answers:
Svetradugi [14.3K]3 years ago
5 0

Answer:

The correct answer would be pairs of nitrogen bases.

DNA (deoxyribonucleic acid) is a double helical structure formed by two strands of DNA.

Deoxyribose sugar and phosphate are linked with phospho-di-ester bond and serve as the backbone of the DNA strands.

Nitrogenous bases are attached to the sugar with the help of glycosidic bond.

Nitrogenous base of one strand forms hydrogen bonds with the nitrogenous bases of the other strands to provide the stability to the structure.


yan [13]3 years ago
3 0
The answer for this question is pairs of nitrogen bases
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Answer:

True

Explanation:

Development, together with globalization, drove severe changes at a global level. The natural and original environments suffered from these effects and still are.

Human beings have constantly been altering the natural ecosystems and causing irreparable damages to nature. For many decades, development involved society and technology advance over new areas unpopulated by humans.

<u>Some</u> of the principal human activities responsible for biodiversity loss are

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All of them involving

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With globalization, transport around the world became normal. And when traveling around the world, new species are intentionally or unintentionally transported too. When these species, of animal or vegetable origin, get established in a new area, they overgrow to the point of turning invasive.

Invasive species are uncontrollable and cause severe damage in native endemic species by competing for resources. The whole ecosystem structure changes.

But there are some background glitches in the system that are the principal responsible for all the mentioned activities. Some important aspects are lacking

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If, as a society, we lack these aspects, the possibilities of changing our impact on nature are far away.  

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3 years ago
22 (101 HC) Why have none of the competing hypotheses about the origin of life on Earth been developed into a scientific theory?
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Because you cannot test it or observe it.

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4 years ago
What is the conclusion of careful studies regarding the relationship between environmental policies, on the one hand, and jobs a
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There is a positive relationship between environmental policies and jobs and the economy.

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