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Anton [14]
3 years ago
14

Give a brief description about how the SHAPE of DNA was discovered. Mention some of the scientists involved.

Biology
1 answer:
iren2701 [21]3 years ago
5 0

<u>Brief description about how the SHAPE of DNA:</u>

DNA is a double helical structure.  The structure of DNA was described by Watson and Creek. They were scientists who got the structure of the DNA by Xray crystallography. They said that the DNA is a double helical structure that is composed of two sugar phosphate backbones that are having one nitrogen base on each sugar molecule.

Each sugar phosphate backbone is at an angle of 36° with the preceding or the succeeding one. They are placed at 20A apart. Each nitrogen base is either Adenine, thymine, guanine or cytosine. Adenine is complementary to thymine and guanine to cytosine. They are complementarily present on the two corresponding sugar phosphates chains. They are 34A to complete one full cycle of the helix.  

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3 years ago
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3 years ago
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how do i describe the second part of anaphase one the cell cycle? as in after the division of chromosomes.
loris [4]

Answer:

<h2><u><em>I think this will help u with the answer that ur looking for. I hope so</em></u></h2>

Explanation:

<h3><u><em>Anaphase is the fourth phase of mitosis, the process that separates the duplicated genetic material carried in the nucleus of a parent cell into two identical daughter cells. Before anaphase begins, the replicated chromosomes, called sister chromatids, are aligned at along the equator of the cell on the equatorial plane. The sister chromatids are pairs of identical copies of DNA joined at a point called the centromere. </em></u></h3><h3><u><em> </em></u></h3><h3><u><em>During anaphase, each pair of chromosomes is separated into two identical, independent chromosomes. The chromosomes are separated by a structure called the mitotic spindle. The mitotic spindle is made of many long proteins called microtubules, which are attached to a chromosome at one end and to the pole of a cell at the other end. The sister chromatids are separated simultaneously at their centromeres. The separated chromosomes are then pulled by the spindle to opposite poles of the cell. </em></u></h3><h3><u><em> </em></u></h3><h3><u><em>Anaphase ensures that each daughter cell receives an identical set of chromosomes, and it is followed by the fifth and final phase of mitosis, known as telophase. </em></u></h3><h3><u><em> </em></u></h3>

<u><em></em></u>

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3 years ago
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