Photosynthesis - Advanced Biology Study Notes by Williams Ph.D. Andrew

Author:Williams Ph.D., Andrew [Williams Ph.D., Andrew]
Language: eng
Format: epub
Publisher: Andrew J. Williams
Published: 2013-05-12T16:00:00+00:00

Here is the equation for the photolysis of water (note the electrons produced):

• Electrons lost by excitation of P680 (PSII) are replaced by those released during the photolysis of water.

• H + formed during photolysis combine with NADP to form NADPH 2 using energy released from electrons as they are passed along electron carriers from Y.

3.1.1 Summary of Cyclic v Non-cyclic

The Effect of temperature on photosynthetic rate:

Temperature has almost no effect on the photochemical reactions involved in the light-dependent stage. However, the reactions of the light-independent stage are largely controlled by enzymes and therefore temperature does act as a limiting factor in this stage. As you expect, increasing temperature will increase the reactions of the light-independent stage.

3.2 Light-Independent Reactions

Melvin Calvin won the Nobel Prize for Chemistry in his studies on this stage. Two important points are:

1. The light-independent stage takes place in the stroma. Since the stroma contains no chlorophyll, students can easily remember that this is where the light-independent reactions occur.

2. The light-independent stage is NOT a dark reaction. It takes place in the dark and in the light. It is independent of light, hence its name.

The reactions of the light-independent stage can be summarized as follows:

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