How does a DNA molecule compare to a RNA molecule?

Answer 1

both have the same DNA , but rna repalces t with u , they both are helix shaped but DNA is a double helix.

DNA is made from ribose, but the ribose in RNA has OH group on carbon 2 and DNA only has a hydrogen on carbon 2.

DNA uses the bases thyamine, adenine, guanine and cytosine, wherase RNA uses uracil instead of thyamine.

mRNA is a single strand of only a few hundred or thousand bases, DNA has many thousands of bases and is double stranded.

tRNA is a strand of RNA pleated in a clover shape. It consists of about 100 base pairs.

rRNA is RNA that binds with protiens to form a ribosome.

These are the main types of RNA.

Answer 2

DNA (deoxyribonucleic acid) and RNA (ribonucleic acid) are both nucleic acids, which means that they are both molecules made of nucleotides linked together. There are three ways that RNA differs from DNA:

1) RNA is made of one strand of nucleotides instead of the two strands that make up DNA (a double helix).

2) Both contain a sugar, but RNA nucleotides contain ribose as opposed to deoxyribose, which is in DNA. Ribose has one more oxygen atom than deoxyribose contains.

3) As well as the nitrogen bases found in DNA, A (adenine), G (guanine), and C (cytosine), RNA nucleotides also have U (uracil) instead of T (thymine). U (uracil) is also complementary to A (adenine) when RNA base-pairs with another nucleic acid.

Most of this information (sometimes word for word) comes from my Biology textbook, "Biology: Principles and Explorations" by Holt, Rinehart, and Winston.

Hope this helps!

Answer 3

Unlike DNA, RNA is almost always a single-stranded molecule and has a much shorter chain of nucleotides. RNA contains ribose, rather than the deoxyribose found in DNA (there is a hydroxyl group attached to the pentose ring in the 2' position whereas RNA has two hydroxyl groups). These hydroxyl groups make RNA less stable than DNA because it is more prone to hydrolysis. Several types of RNA (tRNA, rRNA) contain a great deal of secondary structure, which help promote stability.