Biology, asked by ADSINGH372, 1 year ago

How are the two strands in a dna molecule held together?

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Answered by prantikskalitap8kpsj
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What holds together the two strands of DNA? How is it done?

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are these weak attractions called Hydrogen bonds (even though they are called bonds, they really are just attractions).  Certain elements have higher electronegativities than others which means electrons tend to spend more time around these elements and thus they generally have a negative charge to them (such as oxygen or nitrogen). And then there are those that are not very electronegative, therefore they have a partial positive charge to them (ie hydrogen). Now each DNA strand are oriented in a way where they put the negative charge close enough to the positive charge of the other strand and the attraction is possible.  Now normally these attractions are very weak, but once you consider strands of DNA are thousands or millions of nucleotides long and there are 2-3 of these weak attractions per nucleotide. Then you have a force to be reckoned with

Answered by viji18net
1

Answer:

A DNA strand and its complementary strand are held together by hydrogen bonds. A "G" (guanine) base on one strand will always be bonded to a "C" (cytosine) on the opposite strand by 3 hydrogen bonds.

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