Warning: Use of undefined constant referer - assumed 'referer' (this will throw an Error in a future version of PHP) in /usr/home/essaywo/public_html/essays on line 102

Warning: Use of undefined constant host - assumed 'host' (this will throw an Error in a future version of PHP) in /usr/home/essaywo/public_html/essays on line 105

Warning: Cannot modify header information - headers already sent by (output started at /usr/home/essaywo/public_html/essays:102) in /usr/home/essaywo/public_html/essays on line 106

Warning: Cannot modify header information - headers already sent by (output started at /usr/home/essaywo/public_html/essays:102) in /usr/home/essaywo/public_html/essays on line 109
Nucleic Acids - Online Papers

Nucleic Acids

DNA is the single most important molecule found within cells. It is a stable polynucleotide, which contains coded information for inherited characteristics. It is contained in chromosomes in the nucleus of an eukaryot cell. The essential features of the Watson-Crick model are summarised below.
1. The two helical polynucleotide chains are coiled around a common axis. The two chains have opposite polarity i.e. they are antiparrallel.
2. The regular repeating sugar phosphate backbone of each strand lies on the outside of the helix. The purine and pyrimidine bases project inwards at 900 to the axis of the helix.
3. The two strands are held together by hydrogen bonding between pairs of bases ...

Want to read the rest of this paper?
Join Essayworld today to view this entire essay
and over 50,000 other term papers

Sugar
The sugar will be one of two very similar pentose rings. Ribo contain the sugar ribose. Deoxyribo contain the sugar deoxyribose. The only difference between these two sugars is that deoxyribose contains one oxygen atom less than ribose. Pentose sugars are essential because they are involved in linking different nucleotides together by condensation reactions.
The Nitrogen-Containing Bases
There are two types of bases found in nucleic acids. The purine bases have two nitrogen containing rings, while the pyrimidines have only one. In DNA the purines are adenine (A) and guanine (G) and the pyrimidines are cytosine (C) and thymine (T). In RNA the purine bases are the same as in DNA, but the pyrimidines are cytosine and uracil (U). These rings have the chemical property of being bases because of the nitrogen atoms they contain.
Adenine always forms 2 hydrogen bonds with thymine.
Cytosine always forms 3 hydrogen bonds with guanine.
Phosphate Group
The phosphate group ...

Get instant access to over 50,000 essays.
Write better papers. Get better grades.

Already a member? Login

CITE THIS PAGE:

APA
MLA
Chicago
Turabian

Nucleic Acids. (2003, December 18). Retrieved December 23, 2024, from http://www.essayworld.com/essays/Nucleic-Acids/84

"Nucleic Acids." Essayworld.com. Essayworld.com, 18 Dec. 2003. Web. 23 Dec. 2024. <http://www.essayworld.com/essays/Nucleic-Acids/84>

"Nucleic Acids." Essayworld.com. December 18, 2003. Accessed December 23, 2024. http://www.essayworld.com/essays/Nucleic-Acids/84.

JOIN NOW

Join today and get instant access to this and 50,000+ other essays

PAPER DETAILS

Added: 12/18/2003 12:17:23 PM
Category: Science & Nature
Type: Free Paper
Words: 425
Pages: 2

Save |

Report

SHARE THIS PAPER

SAVED ESSAYS

Save and find your favorite essays easier