Please enable JavaScript.
Coggle requires JavaScript to display documents.
Energy Metabolism: Photosynthesis (Energy & Reducing Power (Reducing…
Energy Metabolism: Photosynthesis
Energy & Reducing Power
Reactions
oxidation reaction
increases +charge on an atom
reduction reaction
reduces +charge on an atom
Compounds
reduced compounds
contains hydrogen
oxidized compounds
often contains a lot of O2
Reducing power
force e- to compounds
converts O2 & CO2 into carbohydrates, fats, etc
oxidizing agents
NAD+
NADP+
reducing agents
NADH
NADPH
redox potential
tendency to accept or donate e-
Other Electron Carriers
Cytochromes
carry e- short distance in membrane
small proteins
Plastoquinones
carry e- short distance in membrane
hydrophobic
Plastocyanin
small protein
carries e- to metal atom (copper)
Photosynthesis
2 Reactions
Thylakoid reactions
Nature of Light
electromagnetic radiation spectrum
ultraviolet light (10-400nm)
infrared light (1000nm -.01cm)
radio waves (.01cm -100m+)
gamma rays (.001-1nm)
microwaves (.01-100cm)
visible light (400-700nm)
X-rays (1-10nm)
Image
Radiation treated 2 ways physically
set of particles called quanta (aka photons)
or as a set of waves
short wavelengths=large amount of energy
long wavelenghts=small amount of energy
Nature of Pigments
pigments- any material that absorbs wavelengths and gives a distinctive color
Photosynthetic Pigments
absorbs light energy to convert it to chemical reactions
chlorophyll a
absorbs only red & blue light
master photosynthetic pigment
hydrophobic tails
Chlorophyll b
almost identical to chlorophyll
caroteniods
absorbs excessive light
protects chlorophylls
antenna complex
set of 300 chlorophylls, carotenoids, & their proteins
light hits pigment --> energy transfer
#
reaction center
pair if chlorophyll a molecules
only molecules to donate excited e-
fluoresences
unstable e- wasting energy
Stroma Reaction
Calvin/Benson Cylce
takes place in stroma
RUBISCO
one of largest & most complex enzyme
constitute 30% of protein in leaf
total of 480,000 daltons
no RUBISCO = no heterotrophs
Image of Calvin Cycle
Enviromental & Internal Factors
Light
3 properties
Quality
colors or wavelengths it contains
Quantity
light intensity or brightness
Duration
time light is present
Anabolic Metabolism
anabolism
rearranged PGA & moved to cytoplasm to grow
Types of Storage compounds
Short Term storage
ATP & NADPH is used
lasts only briefly
Intermediate-term storage
glucose & sucrose move cell to cell
moves through vascular tissue or blood stream
stable for weeks or months
Long-term storage
starch is formed
can be last for years