Navigation Links
Pyrimidine



Pyrimidine
Chemical namePyrimidine
Chemical formulaC4H4N2
Molecular mass80.09 g/mol
Density1.016 g/ml
Melting point20 - 22 C
Boiling point123 - 124 C
CAS number289-95-2
SMILESC1=NC=NC=C1


Pyrimidine is a heterocyclic aromatic organic compound, which is similar to benzene and pyridine and that contains two nitrogen atoms at positions 1 and 3 of the six-membered ring.

Three nucleobases found in nucleic acids, namely cytosine, thymine, and uracil, are pyrimidine derivatives. In DNA and RNA, these bases form hydrogen bonds with their complementary purines.

purine  pyrimidine
   A         T
   G         C

In RNA, the complement of A is U instead of T:

purine  pyrimidine
   A         U
   G         C
Thymine Uracil Cytosine

These hydrogen bonding modes are for classical Watson-Crick base pairing. Other hydrogen bonding modes are available in both DNA and RNA, although the additional 2'-hydroxyl group of RNA expands the configurations through which RNA can form hydrogen bonds.

See also


'"/>


(Date:10/17/2014)... critical and pertinent for practicing physicians and clinicians given ... The Journal, Disaster Medicine and Public Health Preparedness ... Public Health, to surround the public, medical professionals and ... , On October 17, the journal published ... was prepared by Dr. Eric Toner, internist and emergency ...
(Date:10/17/2014)... To date, antidotes ... doctors are often limited to supportive therapy such as induced ... of drugs involved. So what can be done if a ... professor Jean-Christophe Leroux from the Institute of Pharmaceutical Sciences at ... "The task was to develop an agent that could eliminate ...
(Date:10/16/2014)... new synthesis of recent research findings to inform their ... two states. , The Ecology and Management of ... Synthesis of the Relevant Biophysical Science and Implications for ... the U.S. Forest Service,s Pacific Northwest Research Station, is ... a synthesis of the large body of scientific information ...
Breaking Biology News(10 mins):Emergency aid for overdoses 2Emergency aid for overdoses 3New report synthesizes best available science on management of moist mixed-conifer forests 2
... cells can grow new extensions when the amount of three ... , The research examined three related receptor proteins, called ... of rats. , When researchers increased the amount ... up to three times longer than those on nerve cells ...
... the detrimental loss of sea ice sheets in ... the scientific community have been saying for years. Now ... of Earth and Environmental Science are turning their attention to ... having similar effects in the frigid Antarctic region. ...
... tumor cells implanted in mice have shown that the ... breast cancer to the lungs. The new studies by ... genes work together to promote the growth of primary ... cancerous cells to escape into the bloodstream and penetrate ...
Cached Biology News:3 proteins may play important role in nerve-cell repair 2UTSA researchers examine effects of global warming on Antarctic 2A genetic 'gang of 4' drives spread of breast cancer 2A genetic 'gang of 4' drives spread of breast cancer 3A genetic 'gang of 4' drives spread of breast cancer 4
Other biology definitionOther Tags