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Agenda – Monday Oct. 24, 2011
Warm-Up (Metabolism, ATP, Thermodynamics):
Lesson (Photosynthesis and Cellular Respiration):
Wrap-Up (Lesson Review/EOC questions):
Any Remaining Class Time is devoted to A-PLUS
ONLY!! (No leaving class; No sleeping!!)
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Today’s Objectives
I will compare and contrast photosynthesis
and cellular respiration
I will define and classify two types of
metabolism: photosynthesis and cellular
respiration
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Warm-Up
1. Define metabolism and name two important
types of metabolism.
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Metabolism – all of the chemical reactions in a cell
Cellular Energy
Photosynthesis—light energy from the Sun is converted to chemical energy for use by the cell
Cellular respiration—organic molecules are broken down to release energy for use by the cell
Chapter 8
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Warm-Up
2. Which law of thermodynamics describes how
energy is conserved (not created or
destroyed)?
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Laws of Thermodynamics
First law—energy cannot be created nor destroyed.Derived from the law of conservation of energy.
Cellular Energy
Second law—energy cannot be converted without the loss of usable energy.Example: When consumers convert chemical
energy into kinetic energy, some energy is loss as heat to the environment but NOT destroyed.
Chapter 8
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Warm-Up
3. What is ATP and how is used to create
energy?
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ATP: The Unit of Cellular Energy
ATP (Adenosine Triphosphate)
has usable energy stored in the phosphate tail
releases energy when the bond between the second and third phosphate groups is broken
Cellular EnergyChapter 8
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Photosynthesis = process by which producers use the energy of the sun to make food
Stores energy in chemical bonds
- sunlight (radiant energy) is converted to chemical energy
Occurs in the chloroplasts
Cellular Energy
Photosynthesis
Chapter 8
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Carbon dioxide and water are the reactants
Glucose and oxygen are the products
Cellular Energy
Photosynthesis
Chapter 8
The Chemical Reaction
Carbon Dioxide + Water Glucose + Oxygen
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Two Phases of Photosynthesis
Light-Dependent Reactions
Cellular Energy
Light-Independent Reactions or Dark Reactions
Photosynthesis
Chapter 8
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Light Dependent Reactions
Chlorophyll is the green pigment in plants
Cellular Energy
Photosynthesis
Chapter 8
What happens:
- Cholorophyll absorbs light energy from the sun
- Light energy energizes or excites electrons in chlorophyll
- Enzymes transfer the energized (excited) electrons to ATP
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Light Independent Reactions
These are also called the Dark Reactions
Cellular Energy
Photosynthesis
Chapter 8
What happens:
- ATP from the light-dependent reactions is used to convert water and carbon dioxide into glucose and oxygen
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Cellular Respiration
Cellular EnergyChapter 8
Cellular Respiration = process by which consumers obtain energy from the chemical bonds in food
Chemical bonds (found in organic molecules like sugar) are broken down to release energy (ATP)
- Chemical energy is converted to kinetic energy and heat
Occurs in the mitochondria
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The Chemical Reaction
Cellular Respiration
Cellular EnergyChapter 8
The reverse of photosynthesis
Glucose and oxygen are the reactants
Carbon Dioxide and Water are the products
Glucose + Oxygen Carbon Dioxide + Water + Energy
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Comparing Photosynthesis and Cellular Respiration
Cellular EnergyChapter 8
Process Reactants Products Energy Involved
Photosynthesis carbon dioxide, water
glucose, oxygen
input of radiant energy (sunlight)
Cellular Respiration
glucose, oxygen
carbon dioxide, water
release of chemical energy (ATP)
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Wrap-Up
A. photosynthesis
B. cellular respiration
C. homeostasis
D. fermentation
In which metabolic process are molecules broken down to produce carbon dioxide and water?
Cellular Energy
Wrap-Up (Oct. 24)
Chapter 8
A. chloroplasts
B. Golgi apparatus
C. mitochondria
D. vacuoles
Where in the plant cell does photosynthesis take place?
Cellular Energy
Wrap-Up (Oct. 24)
Chapter 8
A. to make ATP
B. to process H2O
C. to store glucose
D. to deliver oxygen
What is the overall purpose of cellular respiration?
Cellular Energy
Wrap-Up (Oct. 24)
Chapter 8
Which metabolic process is photosynthesis?
Cellular Energy
Wrap-Up (Oct. 24)
Chapter 8
A
B
A. glucose
B. oxygen
C. chlorophyll
D. carbon
Photosynthesis converts light energy to stored chemical energy. What form of chemical energy is used in cellular respiration?
Cellular Energy
Wrap-Up (Oct. 24)
Chapter 8
