what is the differentbetween DNA&RNA?

Question

i need that in my study

Answer 1

Both DNA and RNA are composed of repeating units of nucleotides. Each nucleotide consists of a sugar, a phosphate and a nucleic acid base.The sugar in DNA is deoxyribose. The sugar in RNA is ribose, the same as deoxyribose but with one more OH (oxygen-hydrogen atom combination called a hydroxyl). This is the biggest difference between DNA and RNA. Another difference is that RNA molecules can have a much greater variety
of nucleic acid bases. DNA has mostly just 4 different bases with a few extra occasionally. The difference in these bases (between DNA and RNA) allows RNA molecules to assume a wide variety of shapes and also many different functions. DNA, on the other hand, serves as a set of directions and that's about all (but that's absolutely necessary!).

RNA has the base, uracil which replaces thymine in DNA.

Answer 2

DNA and RNA are very similar. Each link in the chain has a nucleoside on the inside attached to a sugar molecule which in turn is attached to a bunch of phosphates. Both can occur as single or double strands, and they can even attach to each other - that's how RNA is transcribed from DNA in the first place!

Both the smallest and the biggest difference between the two lies in that sugar (link 1). RNA uses ribose, and DNA uses deoxy-ribose. As you might imagine, the difference is that DNA has less oxygen... one less OH group to be precise.

And while this might not SEEM like much, it actually makes a HUGE difference. Without that extra OH, DNA links can lie more compactly and evenly together. This makes DNA a significantly more stable molecule than RNA is. Which goes a very long way to explaining their different roles.

In a cell, DNA is used for long-term storage. Because it is more stable, it is better suited to doing so. On the other hand, RNA is very frequently put together and taken apart. Because it is less stable, that means it requires less energy to do this, which is a very good thing. So the structural differences lead to major differences in function as well.

Some of the other differences between the two follow from these uses. RNA tends to use the nucleoside uracil instead of thymine; uracil is easier to make, requires less energy, but is less stable... much like RNA itself. RNA also tends to have a lot more unusual temporary bases instead of its standard four (there are more than a hundred naturally occurring documented substitutions). RNA is also flexible enough to be able to cleave its own backbone, which is a useful feature for a few cellular objects which are made almost entirely of RNA - like ribosomes and other units which help transcribe all the other RNA.

Hope that helps!

Answer 3

RNA has ribose sugars and uracil wheras DNA has deoxyribose and thymine.

For, more information on DNA and RNA, visit the links below:

Answer 4

There are 3 differences:
DNA is 2 stranded, RNA is one stranded.
DNA has a deoxyribose, RNA has a ribose
DNA has nitrogen bases of thymine, adenine and guanine, RNA has a uracil base which replaces the thymine base in DNA.

Answer 5

DNA- DOUBLE HELIX
THYMINE

RNA - SINGLE STRAND
URACIL