Pentose
A pentose is a monosaccharide with five carbon atoms. Pentoses are organized into two groups. Aldopentoses have an aldehyde functional group at position 1. Ketopentoses have a ketone functional group in position 2 or 3.
Aldopentoses
The aldopentoses have three chiral centers and therefore eight different (2^3) stereoisomers are possible.
Ketopentoses
The 2-ketopentoses have two chiral centers, and therefore four different stereoisomers are possible (2^2). The 3-ketopentoses are rare.
Properties
The aldehyde and ketone functional groups in these carbohydrates react with neighbouring hydroxyl functional groups to form intramolecular hemiacetals and hemiketals, respectively. The resulting ring structure is related to furan, and is termed a furanose. The ring spontaneously opens and closes, allowing rotation to occur about the bond between the carbonyl group and the neighbouring carbon atom — yielding two distinct configurations (α and β). This process is termed mutarotation.
Ribose is a constituent of RNA, and the related deoxyribose of DNA.
Podcasts:
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by Corrosion Of Conformity
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by Die Another Day
Goodbye Windows
by: Corrosion Of ConformityPast regrets and future fears
turns a boy to a man sooner than planned
all the same, the boy remains
even though he's free, he can't fly with these heavy chains
saw your mother yesterday
and she had these words to say like a judgement day
i tHiNk He SHoUldA knOwN BETter
i tHiNk He SHoUldA knOwN BETter
I'D RATHER HAVE HOLES IN MY EYES
I'D RATHER HAVE HOLE IN MY EYES
THEN TO WATCH YOUR SOUL PARALYED...GOODBYE
your shining son no longer glows
through the goodbye window
through the goodbye window
Thirsty from the start
very soon you learned the part of the redeemer, what a dreamer
so you're waiting on the call
pretty soon you'll know it all, holy mountains fall
AND HE SAYS...One might make you you lazy
2 might make you crawl
3 might make you crazy
and 4 ends it all
I'D RATHER HAVE HOLES IN MY EYES
I'D RATHER HAVE HOLE IN MY EYES
THEN TO WATCH YOUR SOUL PARALYED...GOODBYE
your shining son no longer glows
through the goodbye window
through the goodbye window...