future_dentist said:
Can anyone please explain:
non-cyclic
cyclic
and Calvin cycle please.....
What should I know about them. I know basic like PS I and II.....oxygen that come out is from water....calvin cycle give out G3P etc....
And yeah what is Sea Urchin question?????
Thank u all..
well...Kaplan blue book never taught non-cyclic and cyclic so all i know is calvin cycle. and I also asked a question about "what's sea urhcin questin?" and ppl said sea urchin extinct and it won't be on the test by the time I take DAT, so let's not worry about it.
photon synthesis has Light/Dark reaction
*light reaction - requires light and happens at thylakod and it produces ATP and NADPH for dark reaction.
*dark reaction- doesn't require light but doesn't have to be dark. it's also known as Calvin cycle. Carbon fixation is what happens here. it's a process that CO2 from air is converted to carbohydrate. It happens at stroma by the way. 3 of CO2 combines with 3 of RuBP. RuBP is 5 carbon thus, (3x1c)+(3x5c) = 18c. since we went through 3 cycle(1 co2 and 1 RuBP in each cycle) we divided this 18c into 3 of 6C. then we can divide 3 of 6C into 6 PGA because PGA is 3C.
anyway en enzyme, rubisco combines CO2 and RuBP if u must know.
6of ATP and 6 of NADPH from light reaction make 6 of PGA into 6 of PGAL. (2ATP and 2NADPH for each CO2[i used 3CO2, remember?])
only 1 PGAL is released and 5PGAL recycle by becoming 3 RuBP with help of 3ATP[how? becuz PGAL has 3C so 5PGAL = 15C =3RuBP since RuBP=5C. anyway theses 3RuBP meet 3CO2 and the cycle repeats]
since 3 cycle releases 1 PGAL, 6 cycle rlease 2 PGAL which is gucose(2PGAL=2 x 3 c = 6c = glucose!)
this is all i know.
