Biochemistry, comparative Photosynthesis

Ann Rev Plant Physiol 23 87-112 Goodwin TW (1952) The Comparative Biochemistry of Carotenoids. Chapman and Hall, London Goodwin TW (ed) (1976) Chemistry and Biochemistry ofPlant Pigments. Academic Press, New York Govindjee (1995) Sixty-three years since Kautsky Chi a fluorescence. Aust J Plant Physiol 22 131-160 Govindjee and Govindjee R (1965) Action spectra for the appearance of difference absorption bands at 480 and 520 nm in illuminated Chlorella cells and their possible significance to a two-step mechanism of photosynthesis. Photochem Photobiol 4 675- 683... 

Ethanoic acid is activated for biosynthesis by combination with the thiol, coenzyme A (CoASH, Figure 18-7) to give the thioester, ethanoyl (acetyl) coenzyme A (CH3COSC0A). You may recall that the metabolic degradation of fats also involves this coenzyme (Section 18-8F) and it is tempting to assume that fatty acid biosynthesis is simply the reverse of fatty acid metabolism to CH3COSCoA. However, this is not quite the case. In fact, it is a general observation in biochemistry that primary metabolites are synthesized by different routes from those by which they are metabolized (for example, compare the pathways of carbon in photosynthesis and metabolism of carbohydrates, Sections 20-9,10). 

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