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mreback14898
Joined: 07 Jul 2008
Posts: 1
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 Posted: Wed Jan 07, 2009 12:39 am Post subject: Question 28 |
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Caffeine is best characterized as a:
A)steroid
B)pyrimidine
C)purine
D)nitrogenous base
C-purine is listed as correct, but so too shouldn't D-nitrogenous base?
It's similar to asking whether ice cream is A)frozen dessert or B)dessert. |
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jellywing_2058
Joined: 04 May 2009
Posts: 179
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| Posted: Wed May 27, 2009 10:33 am Post subject: #28 |
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| The question asks which best describes the molecule. Therefore, yes it is a nitrogenous base, but mentioning purine is even more precise since purines are a subclass of nitrogenous bases. |
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admin
Site Admin
Joined: 08 Dec 2003
Posts: 2176
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| Posted: Thu Jul 30, 2009 3:45 pm Post subject: |
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mohsinalam5969
Joined: 18 Apr 2011
Posts: 50
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| Posted: Tue Jun 21, 2011 1:03 pm Post subject: |
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Caffeine is a bitter, white crystalline xanthine alkaloid(alkaloids are a group of naturally occurring chemical compounds which mostly contain basic nitrogen atoms) that is a psychoactive stimulant..
As it is a basic nitrogenous compound so it is best catagorized as purines (double ringed nitrogenous bases)
so instead of writing it as a nitrogenous base we must go to the depth that which nirtrogenous base is it, and offcourse it is purine.. |
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