Genetics help...?

Question

What are the two major differences between RNA and DNA at the level of the nucleotide?

I have looked and looked... so if you can help me I would greatly appreciate it.

Answer 1

Is this what you are looking for?

RNA uses these four nucleotides:
Adenine
Guanine
Cytosine
Uracil.

DNA uses Thymine in place of Uracil. So DNA uses:
Adenine
Guanine
Cytosine
Thymine.

Hey Tiff, if you want to have a little fun with your instructor, ask him/her WHY Uracil is not used in DNA????

The answer: More than 100 Cytosines spontaneously break down to Uracil each day in each of the body's 100 trillion cells. That would result in more than 10 Quadrillion MUTATIONS each day in the body if the cell did not repair this DNA 'damage'. But how would the cell recognize a 'normal' Uracil from one of these breakdown products? So, Uracil is always recognized as abnormal in DNA because it doesn't belong there in the first place. The cell uses DNA repair mechanisms to fix this spontaneous damage.

Answer 2

RNA contains of ribose, a five carbon sugar, while DNA contains deoxyribose, which is the same as ribose except that a hydroxyl group replaces the hydrogen as position 2.

both DNA and RNA has nucleotide bases A (adenosine), C (cytosine) and G (guanine), but DNA also has base T (thymine) whereas RNA has base U (uracil).

DNA is also a double helix, meaning that two strands are bonded together by hydrogen bonds (two between A and T, three between C and G) whereas RNA is single stranded.

For more reading, check out the links in my sources!

Answer 3

The RNA nucleotide contains ribose sugar, and the DNA contains deoxyribose sugar. Also, the nitrogenous bases are different. DNA nucleotides can contain adenine, thymine, cytosine, or guanine, but only one per nucleotide. The nucleotides pair with each other to complete the double stranded helix known as DNA. The adenine will pair with thymine, and the cytosine with guanine. In RNA however, the nitrogenous base uracil replaces thymine. So the uracil would pair with the adenine instead.

Answer 4

First clue is in the name. DNA has deoxyribose as a sugar, RNA has ribose. In other news, DNA and RNA have different bases. But since I'm not here to do your homework for you, look it up yourself. It's what textbooks were invented for.

Answer 5

DNA is the make up of a human and RNA is te make up of the tissue in a human usually during a biopsy from a tumor.

Answer 6

1.RNA has ribose sugar in it, while DNA has deoxyribose sugar in its nucleotide

2.In RNA, the base uracil replaces thymine,

so DNA has the following bases:
Adenine
Guanine
Cytosine
Thymine

while RNA has the bases:
Adenine
Guanine
Cytosine
Uracil

Answer 7

Maybe also that Uracil in RNA is lacking a methyl group that is present in the otherwise identical Thymine (DNA).

Answer 8

http://www.pbs.org/wgbh/nova/genome/


This is an awesome site with a wonderful video.

All your DNA and RNA questions are contained within this web site.