chapter 7.docx

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Published on 17 Apr 2013
School
WLU
Department
Biology
Course
BI110
Professor
Page:
of 26
Photoautotrophs: Primary Producers of the Earth
Photosynthetic organisms:
o Convert sunlight energy into chemical energy
o Use energy to assemble complex organic molecules
from inorganic raw materials
o Use their own organic molecules as energy sources and
provide energy to other organisms
Energy Flow
The Two Parts of Photosynthesis
Overall, balanced equation: 6CO2 + 12H2O C6H12O6 + O2 +
6H2O
Chloroplasts
Plastids are present in all plant cells

Document Summary

Photosynthetic organisms: convert sunlight energy into chemical energy, use energy to assemble complex organic molecules from inorganic raw materials, use their own organic molecules as energy sources and provide energy to other organisms. Overall, balanced equation: 6co2 + 12h2o c6h12o6 + o2 + The name plastid is from the greek plastikos: = molded : variable in size, shape, content and function. As an example, chloroplasts are capable of sending out tubular extensions called stromules, that serve to increase the surface area and connect plastids together cpdna. Chloroplasts genome contains 120 genes: encodes proteins involved in photosynthesis or expression of chloroplast genes, multiple copies per organelle, prokaryotic gene structure, prokaryotic-like ribosomes. After excitation, one of three events occurs: 1) e- returns to ground state and energy is emitted. 2) e- returns to ground state and energy transfers to another pigment: inductive resonance. 3) excited e- transferred to acceptor photoreduction. Chlorophyll a is oxidized and donates e- to primary e- acceptor.