11 ge lecture presentation

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BIOLOGY A Global Approach Campbell • Reece • Urry • Cain • Wasserman • Minorsky • Jackson © 2015 Pearson Education Ltd TENTH EDITION Global Edition Lecture Presentation by Nicole Tunbridge and Kathleen Fitzpatrick 1 1 Photosyntheti c Processes

Transcript of 11 ge lecture presentation

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BIOLOGYA Global Approach

Campbell • Reece • Urry • Cain • Wasserman • Minorsky • Jackson

© 2015 Pearson Education Ltd

TENTH EDITION

Global Edition

Lecture Presentation by Nicole Tunbridge andKathleen Fitzpatrick

11Photosynthetic

Processes

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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

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a) Autotrophs sustain themselves without eating anything derived from other organisms

b) Autotrophs are the producers of the biosphere, producing organic molecules from CO2 and other inorganic molecules

c) Almost all plants are photoautotrophs, using the energy of sunlight to make organic molecules

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Figure 11.1

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Figure 11.1a

Other organisms also benefit fromphotosynthesis.

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a) Photosynthesis occurs in plants, algae, certain other unicellular eukaryotes, and some prokaryotes

b) These organisms feed not only themselves but also most of the living world

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Figure 11.2

(a) Plants

(b) Multicellular alga

(c) Unicellular eukaryotes

(d) Cyanobacteria

(e) Purple sulfurbacteria

40μm

1 μm

10 μ

m

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a) Heterotrophs obtain their organic material from other organisms

b) Heterotrophs are the consumers of the biosphere

c) Almost all heterotrophs, including humans, depend on photoautotrophs for food and O2

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a) Earth’s supply of fossil fuels was formed from the remains of organisms that died hundreds of millions of years ago

b) In a sense, fossil fuels represent stores of solar energy from the distant past

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Figure 11.3

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Concept 11.1: 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 organelles allows for the chemical reactions of photosynthesis

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Chloroplasts: The Sites of Photosynthesis in Plants

a) Leaves are the major locations of photosynthesis

b) Chloroplasts are found mainly in cells of the mesophyll, the interior tissue of the leaf

c) Each mesophyll cell contains 30–40 chloroplasts

d) CO2 enters and O2 exits the leaf through microscopic pores called stomata

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a) A chloroplast has an envelope of two membranes surrounding a dense fluid called the stroma

b)Thylakoids are connected sacs in the chloroplast which compose a third membrane system

c) Thylakoids may be stacked in columns called grana

d)Chlorophyll, the pigment which gives leaves their green colour, resides in the thylakoid membranes

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Figure 11.4

Stroma Granum

ThylakoidThylakoidspace

Outermembrane

IntermembranespaceInnermembrane

20 μm

Stomata

Chloroplast Mesophyllcell

1 μm

Mesophyll

Chloroplasts VeinLeaf cross section

CO2 O2

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Figure 11.4a

Leaf cross section

Stomata

Chloroplast

Mesophyll

Chloroplasts Vein

Mesophyllcell

20 μm

CO2 O2

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Figure 11.4b

Chloroplast

Stroma Granum

ThylakoidThylakoidspace

Outermembrane

IntermembranespaceInnermembrane

1 μm

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Tracking Atoms Through Photosynthesis: Scientific Inquiry

a) Photosynthesis is a complex series of reactions that can be summarized as the following equation:

6 CO2 + 12 H2O + Light energy → C6H12O6 + 6 O2 + 6 H2O

b) The overall chemical change during photosynthesis is the reverse of the one that occurs during cellular respiration

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The Splitting of Water

a) Chloroplasts split H2O into hydrogen and oxygen, incorporating the electrons of hydrogen into sugar molecules and releasing oxygen as a by-product

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Figure 11.5

Reactants:

Products:

6 CO2 12 H2O

C6H12O6 6 H2O 6 O2

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Photosynthesis as a Redox Process

a) Photosynthesis reverses the direction of electron flow compared to respiration

b) Photosynthesis is a redox process in which H2O is oxidized and CO2 is reduced

c) Photosynthesis is an endergonic process; the energy boost is provided by light