DNA vs RNA - Difference and Comparison | Diffen

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** DNA vs RNA **

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The *main difference between DNA and RNA* is the sugar present in the
molecules. While the sugar present in an RNA molecule is /ribose/, the
sugar present in a molecule of DNA is *deoxyribose*. Deoxyribose is the
same as ribose, except that the former has one more OH.

DNA does not usually exist as a single molecule, but instead as a
tightly-associated pair of molecules. These two long strands entwine like
vines, in the shape of a double helix. This arrangement of DNA strands is
called antiparallel. The asymmetric ends of DNA strands are referred to as
the 5′ (five prime) and 3′ (three prime) ends. One of the major
differences between DNA and RNA is the sugar, with 2-deoxyribose being
replaced by the alternative pentose sugar ribose in RNA. The four *bases
found in DNA* are /adenine/ (abbreviated A), /cytosine/ (C), /guanine/ (G)
and /thymine/ (T). A fifth pyrimidine base, called /uracil/ (U), usually
takes the place of thymine in *RNA* and differs from thymine by lacking a
methyl group on its ring.

*Comparison chart*

DNA RNA
Stands for: DeoxyriboNucleicAcid RiboNucleicAcid
Definition: A nucleic acid that contains the genetic instructions used in
the development and functioning of all modern living organisms(scientists
believe that RNA may have been the main genetic material in primitive life
forms). A single-stranded chain of alternating phosphate and ribose units
with the bases Adenine, Guanine, Cytosine, and Uracil bonded to the ribose.
RNA molecules are involved in protein synthesis and sometimes in the
transmission of genetic information.
Job/Role: Medium of long-term storage and transmission of genetic
information Transfer the genetic code needed for the creation of proteins
from the nucleus to the ribosome


Source: www.diffen.com/difference/DNA_vs_RNA


how are dna and rna different


DNA versus RNA - Differences Between DNA and RNA

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** DNA versus RNA **

*Differences Between DNA and RNA*

By Anne Marie Helmenstine, Ph.D., About.com Guide

"DNA is easy to recognize on sight because of its characteristic double
helix."

DNA is easy to recognize on sight because of its characteristic double
helix.

Ben Mills
*See More About*

· dna
· rna
· nucleic acids
· biochemistry
· molecules

DNA stands for deoxyribonucleic acid, while RNA is ribonucleic acid.
Although DNA and RNA both carry genetic information, there are quite a few
differences between them. This is a comparison of the differences between
DNA versus RNA, including a quick summary and a detailed table of the
differences.

-Summary of Differences Between DNA and RNA-

1. DNA contains the sugar deoxyribose, while RNA contains the sugar ribose.
The only difference between ribose and deoxyribose is that ribose has one
more -OH group than deoxyribose, which has -H attached to the second (2')
carbon in the ring.

2. DNA is a double stranded molecule while RNA is a single stranded
molecule.

3. DNA is stable under alkaline conditions while RNA is not stable.

4. DNA and RNA perform different functions in humans. DNA is responsible
for storing and transferring genetic information while RNA directly codes
for amino acids and as acts as a messenger between DNA and ribosomes to
make proteins.

5. DNA and RNA base pairing is slightly different, since DNA uses the bases
adenine, thymine, cytosine, and guanine; RNA uses adenine, uracil,
cytosine, and guanine. Uracil differs from thymine in that it lacks a
methyl group on its


Source: chemistry.about.com/od/lecturenoteslab1/a/Dna-Versus-Rna.htm

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