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Energy Metabolism: Photosynthesis (Factors (Crassulacean Acid Metabolism…
Energy Metabolism: Photosynthesis
Energy
Photosynthesis
#
Sunlight
Plant Pigments
Use Chemical Reactions
Theoretical Examples
Enter Every Reaction
Make Smaller Molecules
Large Molecules
ADP to ATP Methods
Photophosphorylation
Light Energy
Substrate-Level Phosphorylation
Force of Phosphate onto ADP
Animals
Fungi
Nonchlorophyllous Plants
Oxidative Phosphorylation
Phosphorylation of ADP
Reducing Power
Oxidized
Can Carry More Electrons
Oxidation State
Covalent Bonds
Oxidation Reaction
More Postive
Contains Oxygen
Most Compounds in Environment
Oxidizing Agents
Oxidize Material
NADP+
NAD+
Reduced
Reduction Reaction
More Negative
Contains Hydrogen
Most Compounds in Organisms
Reducing Power
Forcing Electrons onto Compounds
Reducing Agents
Reduce Material
NADH
NADPH
Oxidation-Reduction Reaction
Redox Reaction
Combines Oxidization and Reduction
Single Reaction
Other Electron Carriers
Cytochromes
Small Proteins
Contain Heme
Thylakoid Membranes (Part Of)
Carry Between Sites
Plastoquinones
Hydrophobic
Short Distances
2 Electrons
Binds 2 Protons
Plastocyanin
Small Protein
Used in Copper
Short Distances
Photosynthesis
Combination of CO2 and H20
Abundant
Stable
Nontoxic
Forms Carbohydrates
Nontoxic
Two Parts
Thylakoid Reactions
Light Dependent Reactions
Pigment
Absorbs Certain Wavelengths
Distinct Color
Chlorophyll a
Some Red/Blue Light
No High-Energy Quanta
Fluorescence
Release of Light
Chlorophyll b
Land Plants
Accessory Pigments
Absorbs Light Missed by Chlorophyll a
Photosynthetic Unit
Pigments and Carries that Work Together
Photosystem I
Little Chlorophyll b
P700
Pair of Chlorophylls
Produces NADPH
Photosystem II
Reduces P700
ATP Snythase
Occurs in Thylakoid Lumen
Stroma Reactions
Makes Carbohydrate
Occurs in Stroma
A.K.A. Calvin Cycle
Anabolic Metabolism
Anabolism
Anabolic Reactions
Anabolic Pathways
Synthetic Pathways
Fats and Polysaccharides
Storage of Energy and Carbon
Polysaccharide Synthesis
Gluconeogenesis
Glucose Synthesis
Anabolic
Starch
Amylose
Digested Slowly
Amylopectin
Digested Quickly
Makes Glucose Available
Factors
Light
Quality
Colors
Wavelengths
Quantity
More Light is Beneficial
More CO2 Available
May Be Too Intense
Less Light
Less CO2 Available
Duration
Long Hours
Lots of Photosynthesis
Can be Harmful
Short Hours
Less Photosynthesis
Leaf Structure
Temperate/Tropical Leaves
Palisade Parenchyma Top Layer
Mesophyll Bottom Layer
Water Conservation Inefficient
Dry Habitat Leaves
Cells Packed Tightly
Reduced Water Loss
Slows Photosynthesis
Water
Water Loss
Daytime
Dry Soil
Water Retention
Nighttime
C4 Metabolism
CO2 in a Leaf
Absorbed
Transported
Concentrated
Kranz Autonomy
Chlorophyllous Cells
Mesophyll Cells
PEP Carboxylase
CO2 Affinity
Reduced to Malate
Crassulacean Acid Metabolism
Conservation of Water
Improves
Similar to C4 Metabolism
Acids are Accumulated
Stomata Opens at Night
Not Efficient
Hot, Dry Climates