Lecture_6_photosynthesis

Lecture_6_photosynthesis - 3/25/11 What do these organisms...

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3/25/11 1 Biology 230 Jennifer Breckler Photosynthesis Chap10, p108-111,118-121 Campbell (8e) What do these organisms have in common? Photosynthesis Concepts Structures involved Stages of photosynthesis Light reaction (linear electron flow and cyclic electron flow) Calvin cycle (carbon fixation, reduction and regeneration) Alternative mechanisms of carbon fixation Plants perform photosynthesis. What’s photosynthesis? Photosynthesis • Photosynthesis is the plant’s ability to ‘capture’ light energy from the sun and convert it to chemical energy . • This chemical energy is then used to produce all of the organic molecules needed by the plant in order to live. Note: Plants are a type of autotroph (self-feeders) because they produce organic carbon-containing molecules on their own from non-living raw materials. Animals are Heterotrophs (consumers of live or dead organisms as a source of organic material) Light energy is a type of electromagnetic radiation A photon is a discrete “particle” of light with a fixed amount of energy
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3/25/11 2 Light energy excites the electrons in photosynthetic pigments such as chlorophyll When the pigment molecule absorbs light, an electron is boosted to an “excited” state. 5 µ m Mesophyll cell Stomata CO 2 O 2 Chloroplast Mesophyll Vein Leaf cross section Leaves have mesophyll cells and inside the mesophyll cell are structures called chloroplasts containing the chlorophyll pigment. During photosynthesis, the leaf also contains holes that help exchange gases with the air. These holes are called stomata . Where is chlorophyll? Thylakoid space Chloroplast Granum Intermembrane space Inner Outer membrane Stroma Thylakoid Chloroplast * * * *know these terms Q: A chloroplast is a(n): a. cell b. organelle c. molecule d. thylakoid Review of important structures inside a mesophyll cell • Chloroplast – This is an organelle with 2 outer membranes (interesting that mitochondria have 2 membranes, too!). The interior is called the ‘stroma’ • Inside the chloroplast is a granum , which looks like a stack of coins .
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Lecture_6_photosynthesis - 3/25/11 What do these organisms...

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