17Feb_13

17Feb_13 - Biological Science I Tuesdays and Thursdays...

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Biological Science I Tuesdays and Thursdays 8:00-9:15, HCB 102 Mondays 5:15-6:15, KIN 1024 17 February 2011 – Lecture 13 PHOTOSYNTHESIS 1. By the end of this lecture you should be able to a. Describe the structure of a chloroplast b. Describe the relationship between an action spectrum and an absorption spectrum c. Trace the movement of electrons in linear electron flow d. Trace the movement of electrons in cyclic electron flow e. Describe the similarities and differences between oxidative phosphorylation in mitochondria and photophosphorylation in chloroplasts f. Describe the role of ATP and NADPH in the Calvin cycle g. Describe the major consequences of photorespiration h. Describe two important photosynthetic adaptations that minimize photorespiration 2. The Process That Feeds the Biosphere a. Photosynthesis is the process that converts solar energy into chemical energy b. Directly or indirectly, photosynthesis nourishes almost the entire living world c. Can classify life forms into two groups: d. Autotrophs d.i. Sustain themselves without eating anything derived from other organisms d.ii. The producers of the biosphere, d.iii. Produce organic molecules from CO 2 and other inorganic molecules d.iv. Almost all plants are photoautotrophs, using the energy of sunlight to make organic molecules from H 2 O and CO 2 d.v. Photosynthesis occurs in plants, algae, certain other protists, and some prokaryotes d.vi. These organisms feed not only themselves but also most of the living world e. Heterotrophs e.i. Obtain their organic material from other organisms e.ii. Consumers of the biosphere e.iii. Depend on photoautotrophs for food and O 2 3. Photosynthesis converts light energy to the chemical energy of food. a. Chloroplasts are structurally similar to and likely evolved from photosynthetic bacteria b. The structural organization of these cells allows for the chemical reactions of photosynthesis c. Leaves are the major locations of photosynthesis d. Their green color is from chlorophyll, the green pigment within chloroplasts e. Light energy absorbed by chlorophyll drives the synthesis of organic molecules in the chloroplast 1
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Tuesdays and Thursdays 8:00-9:15, HCB 102 Mondays 5:15-6:15, KIN 1024 17 February 2011 – Lecture 13 f. CO 2 enters and O 2 exits the leaf through microscopic pores called stomata g. Chloroplasts are found mainly in cells of the mesophyll, the interior tissue of the leaf h. A typical mesophyll cell has 30–40 chloroplasts i. The chlorophyll is in the membranes of thylakoids (connected sacs in the chloroplast); thylakoids may be stacked in columns called grana j. Chloroplasts also contain stroma, a dense fluid k. Veins deliver water from the roots and carry off sugar from mesophyll cells to nonphotosynthetic areas of the plant. l.
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This note was uploaded on 11/07/2011 for the course BIO bsc2010 taught by Professor Trombley during the Spring '08 term at FSU.

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17Feb_13 - Biological Science I Tuesdays and Thursdays...

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