Nucleic Acids - DNA / ADN

ADN / DNA
DNA, or deoxyribonucleic acid, is the hereditary material in humans and almost all other organisms. Nearly every cell in a person's body has the same DNA. Most DNA is located in the cell nucleus (where it is called nuclear DNA), but a small amount of DNA can also be found in the mitochondria (where it is called mitochondrial DNA or mtDNA).

The information in DNA is stored as a code made up of four chemical bases: adenine (A), guanine (G), cytosine (C), and thymine (T). Human DNA consists of about 3 billion bases, and more than 99 percent of those bases are the same in all people. The order, or sequence, of these bases determines the information available for building and maintaining an organism, similar to the way in which letters of the alphabet appear in a certain order to form words and sentences.

DNA bases pair up with each other, A with T and C with G, to form units called base pairs. Each base is also attached to a sugar molecule and a phosphate molecule. Together, a base, sugar, and phosphate are called a nucleotide. Nucleotides are arranged in two long strands that form a spiral called a double helix. The structure of the double helix is somewhat like a ladder, with the base pairs forming the ladder's rungs and the sugar and phosphate molecules forming the vertical sidepieces of the ladder.

An important property of DNA is that it can replicate, or make copies of itself. Each strand of DNA in the double helix can serve as a pattern for duplicating the sequence of bases. This is critical when cells divide because each new cell needs to have an exact copy of the DNA present in the old cell.

Category:

Education

Tags:

• Bioquimica
• Biochemistry
• health
• medicine
• biology
• phisiology
• human
• body

[MistisAdventures]

We learned about the pairs rule today in science :)))

[P3T3RYANG]

If this helps anyone out there, here's a little bit more information. Towards the end of the clip you are given images of Adenine bound to Thymine and Guanine bound to Cytosine. Adenine and Thymine are bound together by 2 hydrogen bonds, while Guanine and Cytosine are bound by 3 hydrogen bonds. This information is somewhat useful because this basically tells you a G to C bond is more stable. Oh, and A's and G's are Purines while T's and C's are Pyrimidines. :)

[Mouslima9217]

thank You

[trevorgodchild]

its the summ on the life sustaining processes that provide for the maintenance growth and repair of of the cell.i love this animated sequence very nice

[trevorgodchild]

yes good info

[mytimeisnow17]

tnx so much