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Why would you expect equal numbers of guanine and cytosine in a molecule of DNA, but not necessarily in a molecule of RNA?

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xxamari

Answer:

DNA is double-stranded, so there must be equal numbers of C and G because they pair to each other on the complementary strands.

RNA is only single-stranded, so there can be any number of C and G. They don't pair to each other, because there's only one strand.

Oseni

Equal numbers of guanine and cytosine would be expected in a molecule of DNA, but not RNA because:

  • DNA is double stranded with the first strand being a complimentary copy of the other. The two strands are also associated with each other by hydrogen bond.
  • RNA is single strand.

In the double strand DNA, Adenine always pair with Thymine while Guanine always pair with Cytosine. Hence the number of Adenine must be equal to that of Thymine while that of Guanine must be equal to Cytosine.

The single strandness of RNA means that it can contain an arbitrary amount of any of the bases without following a particular rule.

More on RNA can be found here: https://brainly.com/question/20914096

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