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Purines

purines

A series of heterocyclic compounds that are variously substituted in nature and are known also as purine bases. They include adenine and guanine, constituents of nucleic acids, as well as many alkaloids such as caffeine and theophylline. Uric acid is the metabolic end product of purine metabolism.


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can anyone help me answer these biology questions?

... - what is cell fractionation used for? - 2 atoms that are equal in electronegativity form what? - know which acids are pyrimidines and which are purines **hint: remember Pur As Gold (Purines= Adenine and Guanine) and Cut The Pye (Pyrimidines = Cytosine and Thymine) - these 2 functional groups ...

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by tungvinchenzo
Thu Feb 05, 2009 8:55 am
 
Forum: General Discussion
Topic: can anyone help me answer these biology questions?
Replies: 2
Views: 742

Re: IBO 2003 questions- please help me out

... synthesis until the sprout can supply its own nutrients. Not sure about part B. My guess is E. AMP goes to Adenosine + Pi in the catabolism of purines. It is essentially the hydrolysis of AMP and most certainly doesn’t generate a high-energy source like ATP. All the other reactions are possible ...

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by blcr11
Mon May 12, 2008 5:54 pm
 
Forum: Cell Biology
Topic: IBO 2003 questions- please help me out
Replies: 9
Views: 1557

Re: Simple Nucleic Acid Question

... acids—which definitely are the direct building blocks of peptides and proteins—also enter nucleic acid metabolism, and are used to synthesize the purines and pyrimidines that go into RNA and DNA. Most people (meaning at least me, I suppose) don’t consider amino acids to be building nucleic acids ...

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by blcr11
Mon Feb 18, 2008 7:25 am
 
Forum: Molecular Biology
Topic: Simple Nucleic Acid Question
Replies: 1
Views: 440

RNA which carries amino acids to the ribosome?

Is the answer: tRNA Also, Two nitrogen bases of DNA which are purines? Is the answer: Adenine & Guanine thanks for your help, checking my answers as I need to double check.

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by faith1726
Thu Apr 12, 2007 5:24 pm
 
Forum: Genetics
Topic: RNA which carries amino acids to the ribosome?
Replies: 1
Views: 665

depurination in southern blot

hello, In Southern Blot, we use HCl 0,25M to depurinate DNA in agarose gel before denaturing with NaOH 0,4M. The role of HCl was said to eliminate purines (A & G). But when purines were shot out, DNA will be cut in very small fragments with only pyrimidines (C & T) ! So the sequences died ...

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by kabuto
Wed Nov 08, 2006 2:07 pm
 
Forum: Molecular Biology
Topic: depurination in southern blot
Replies: 0
Views: 738
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