Questions tagged [dna-helix]

The structure formed by the double-stranded DNA molecules.

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Geometric Interpretations of the DNA Double Helix

In mathematics, a helix is a shape which has constant curvature and constant torque (see Wikipedia here. What are the biological implications of the DNA double helix having constant curvature and ...
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Why does the structure of RNA change? [closed]

RNA only has one strand, but like DNA, is made up of nucleotides. RNA strands are shorter than DNA strands. RNA sometimes forms a secondary double helix structure, but only intermittently. Why does ...
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1answer
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A question about dna triplex

Short DNA triplex strands have been identified in various organsims. But, would injecting a single strand of DNA or RNA (with its bases complementary to the bases of DNA found in the major groove of a ...
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3answers
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Does any molecule other than DNA have a double-helical structure?

DNA is known to have a double-helical structure. Do any other molecules have this structure?
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1answer
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At what point, when connected, do DNA strands become a helix?

When synthesizing DNA strands and beginning to "connect" them, how quickly does it become a helix? In this answer, canadianer says The helical structure is more stable than the "straight" form (...
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2answers
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Twist in the DNA double-helix

DNA, has a deoxyribose sugar — phosphate backbone with the purine and pyrimidine bases, adenine, cytosine, thymine, and guanine connected to the deoxyribose sugar. (The base–sugar molecules are ...
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2answers
834 views

Sections Of DNA

I know what major (2.2 nm) and minor (1.2 nm) groves are, but what is then name for: a 360-degree rotation of DNA (3.4 nm) the gap between each base pair (0.34 nm)?
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0answers
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Do mutations come in pairs? [closed]

As DNA is organized in a double-helix, a change in one strand must be accompanied by a corresponding change in the other strand. Let's say an original sequence CATCAT mutates into CATGAT. The other ...
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1answer
591 views

What limits chromosomal length?

What are the upper and lower limits for chromosome length? Are these limits different in different species or kingdoms? If there is any limit, which cellular or molecular factors are reasons?