Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!usc!wuarchive!uunet!zephyr.ens.tek.com!uw-beaver!ubc-cs!alberta!herald.usask.ca!ccu.umanitoba.ca!frist
From: frist@ccu.umanitoba.ca
Newsgroups: sci.bio
Subject: Re: Quiz time
Message-ID: <1991Apr26.142343.9514@ccu.umanitoba.ca>
Date: 26 Apr 91 14:23:43 GMT
References: <1991Apr24.134105.25827@pa.dec.com> <212@tdatirv.UUCP>
Organization: University of Manitoba, Winnipeg, Canada
Lines: 33

In article <212@tdatirv.UUCP> sarima@tdatirv.UUCP (Stanley Friesen) writes:
>In article <1991Apr24.134105.25827@pa.dec.com> mikkelson@breakr.enet.dec.com (snopes) writes:
...  other answers to Quiz deleted
>
>Ribulose biphosphate is not involved in photosynthesis (it sounds like

>a early precurser to RNA).
>
>---------------
>uunet!tdatirv!sarima				(Stanley Friesen)

Ribulose bisphosphate is the acceptor for CO2 in the reductive pentose
cycle aka Calvin cycle for carbon fixation. This reaction is catalyzed
by ribulose bisphosphate carboxylase/oxygenase (RUBISCO). Ribulose
bisphosphate is, therefore, about as intimately involved in photosynthesis
as you can get!

For those interested, the reaction in plants with C3 metabolism is

3 Ribulose-bis-P + 3 CO2 --> 6 glyceraldehyde-3-phosphate

In plants with C4 and CAM metabolism, phosphoenol pyruvate is the initial
CO2 acceptor, and carbon is transferred by way of intermediates to the
Calvin cycle.
===============================================================================
Brian Fristensky                |  
Department of Plant Science     | "There's a big ... machine in the sky...
University of Manitoba          | some kind of electric snake... coming
Winnipeg, MB R3T 2N2  CANADA    | straight at us." 
frist@ccu.umanitoba.ca          | "Shoot it," said my attorney.
Office phone:   204-474-6085    |"Not yet," I said,"I want to study its habits"
FAX:            204-275-5128    |H.S. Thompson, FEAR & LOATHING IN LAS VEGAS
===============================================================================