Biol113 Lec 23 Photosynthesis 11.15.19 S(1).pptx - Photosynthesis Lecture 23 Learning objectives Students will • Identify where the carbons in the

Biol113 Lec 23 Photosynthesis 11.15.19 S(1).pptx -...

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Photosynthesis Lecture 23
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Learning objectives Students will Identify where the carbons in the resulting carbohydrate comes from. Predict how much energy would be needed for a pigment to reach excitation. Describe the roles of P680 and P700 in photosynthesis. Predict the energy state of electrons in photosynthetic molecules. Predict the affect of changing concentrations of certain substances on the rate of the Calvin cycle. Identify the flow of carbon from atmosphere to organic carbon and back to the atmosphere. Predict the result of a mutation within a photosynthetic pathway.
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Use it to make ATP ATP broken down & energy released Eat carbs ANIMALS Cell. Resp. PLANTS Cell. Resp. Absorb sunlight, use it to make carb from CO2 Photosynthesis Use carb to make ATP
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Photosynthesis uses solar energy to make a carbohydrate from CO2. The carb stores energy and is eventually broken down by the plant to make ATP… Plants do photosynthesis AND cellular respiration!
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Two reactions of photosynthesis: Light dependent reaction Photons + H2O ATP + NADPH +O2 Calvin Cycle ATP + NADPH + CO2 Carbohydrate (Sunlight)
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1. True or false: During photosynthesis, the carbon in CO2 is converted into a carbohydrate. 2. Take a look at the chemistry of the light dependent reaction: Where does the O2 byproduct come from?
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Where does photosynthesis occur? stroma thylakoid disks leaf Mesophyll cell chloroplast thylakoid disk CONTEXT/LOCATION stroma
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Where does photosynthesis occur? stroma thylakoid disks stroma thylakoid disk Light dependent reaction occurs in the thylakoid disk membrane. These reactions are facilitated by two pigment complexes: photosystem II and photosystem I.
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Photosystems are located _______ in the thylakoid disk membrane. They contain light-absorbing _____ and proteins. ____ is passed from ______ to ________ until it reaches the ____________. What is a photosystem? Look carefully at the diagram and fill in the blanks:
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In these photon transfers, the receiving molecule a) Must require less energy for excitation b) Must require more energy for excitation (compared to the donor molecule)
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Excitation When a pigment absorbs a photon, the pigment’s electron gets bumped to a higher energy level. An excited pigment is unstable, it can either transfer energy or its electron to another molecule.
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