Photosynthesis (updated honors biology) - Duration: 21:14

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Photosynthesis - Biology-Online Dictionary

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A level biology photosynthesis - Share and Discover …

A level biology photosynthesis 1

What is photosynthesis and why it is important
Photosynthesis is a process during which energy from light is harvested and used to drive synthesis of organic carbohydrates from carbon dioxide and water, generating oxygen. Photosynthesis is the only way that radiant energy from the sun can be converted into organic molecules for plants and animals to consume.

Photosynthesis A Level Biology Revision Video - YouTube

With detailed aspects of aerobic respiration like the electron transport chain in the cristae of the mitochondria to axons and nerve transmission, the new A Level Biology specification is certainly interesting but also quite challenging. Maths Made Easy is here to help with a series of in depth A Level Biology revision materials. Remember if you get stuck you can always book an expert A Level Biology tutor. Good luck with your A Level Biology revision!

Photosynthesis a-level revision


A2 - AQA Biology (Unit 4) - Photosynthesis - Document …

Dark reaction – Calvin cycle
Second step of photosynthesis is called Calvin’s cycle. Because it does not require light, so it is called dark reaction. During dark reaction, the ATP and NADPH generated by light reaction are consumed to fix carbon dioxide into organic carbohydrates. The first fixed carbohydrate is a three carbon compound 3-phosphoglycerate (3PGA). The final product is a high-energy 3 carbon compound glyceraldehyde-3-phosphate (G3P) which can be used to synthesize a broad range of organic molecules. An important intermediate molecule for carbon dioxide fixation is ribulose bisphosphate (RuBP), and the enzyme catalyzing the CO2 fixation is Rubisco.

Molecular Biology of Photosynthesis

A limiting factor is a factor that controls a process. Light intensity, temperature and carbon dioxide concentration are all factors which can control the rate of photosynthesis. Usually, only one of these factors will be the limiting factor in a plant at a certain time. This is the factor which is the furthest from its optimum level at a particular point in time. If we change the limiting factor the rate of photosynthesis will change but changes to the other factors will have no effect on the rate. If the levels of the limiting factor increase so that this factor is no longer the furthest from its optimum level, the limiting factor will change to the factor which is at that point in time, the furthest from its optimum level. For example, at night the limiting factor is likely to be the light intensity as this will be the furthest from its optimum level. During the day, the limiting factor is likely to switch to the temperature or the carbon dioxide concentration as the light intensity increases.