photosynthesis short answer practice
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Photosynthesis Short Answer Practice. #1 What makes chlorophyll so unique?. Made of photon-absorbing porphyrin ring w ith Mg in center Nitrogen atoms around the Mg Photon of light r esonates the e- b etween the single a nd double bonds. #1 What makes chlorophyll so unique?. - PowerPoint PPT PresentationTRANSCRIPT
Photosynthesis Short Answer Practice
#1 What makes chlorophyll so unique?
• Made of photon-absorbing porphyrin ringwith Mg in centerNitrogen atoms around the Mg• Photon of lightresonates the e-between the singleand double bonds
#1 What makes chlorophyll so unique?
• Hydrocarbon tailAttaches to Integral protein in theThylakoid disk membrane
#2 Compare PSII and PSI
• Both absorb photons and excite e-• Both contain chlor a + other pigments
• Reaction center of PSII absorbs 680 nm• Reaction center of PS I absorbs 700 nm
• PSII receives e- from split water• PS I receives e- from Pc (end of ETC)
#2 Compare PSII and PSI
PSII PSI
-PSII gives electrons to ETC-PSI give electrons to NADP+
FOUND IN THYLAKOID DISK MEMBRANE
#3Compare chemiosmosis and ETC in mitochondrion and chloroplast:
• Mitochondrion• e- come from food
molecules• e- have high potential
energy in bonds in organic compounds
• e- passed to oxygen• Oxygen pick up H+ to
form H2O
• Chloroplast• e- come from splitting of
H2O• Light energy excites e- to a
higher energy level• e- flow from H2O to
reaction center 680 in PSII to reaction center 700 in PSI
• From PSI to NDR to reduce NADP+ to NADPH
#4 CFC’s
• Chlorofluorocarbons• Were put in aerosols, refrigerants, and styrofoam
• Products containing CFC’s were Banned by those signing the Montreal Protocol 1987
• Recovery of ozone not expected until 2060’s.
Ozone O3
• O3 (seen in teal blue in diagram)• Protective layer around the earth keeping harmful
UV rays from reaching the earth
• UV rays• (some enter, some blocked)
• Infrared (trapped)
#4 CFC’s• Cl breaks off
an oxygen from ozone (O3) so it is no longer a protective layer around the earth.
Global Warming
• refers to the rising average temperature of Earth's atmosphere and oceans
Greenhouse GasesCO2 (carbon dioxide) – most important!
H2O (water vapor)
CH4 (methane)
CFC’s (chlorofluorocarbons)
These can absorb heat and warm the atmosphere.
Causes and Effects of Global Warming• Increase in greenhouse gases: especially CO2
(mostly from fossil fuel emissions)
-Kills coral reefs-Melts polar icecaps-Raises ocean levels-Upsets weather
CFC’s and Global Warming
#4 Global Warming Solutions• Photosynthesis removes CO2
from the atmosphere • Reduce fossil fuel use (CO2 is an important
global warming gas -absorbs heat)• Use alternate energy sources (wind, solar,
geothermal, hydroelectric)