Energy and Life
photosynthesis
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Warm-up 10/25/12
1. DEFINE PHOTOSYNTHESIS
2. WRITE THE BALANCED CHEMICAL
FORMULA FOR PHOTOSYNTHESIS
(LEAVE ROOM BELOW THE FORMULA
TO WRITE NOTES).
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8-1 Energy and Life
Autotrophs and Heterotrophs
Living things need energy to survive.
This energy comes from food. The energy in
most food comes from the sun.
Where do plants get the energy they need
to produce food?
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8-1 Energy and Life
Autotrophs and Heterotrophs
Autotrophs and Heterotrophs
Plants and some other types of
organisms are able to use light energy
from the sun to produce food.
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8-1 Energy and Life
Autotrophs and Heterotrophs
• Organisms, such as plants, which make their own
food, are called autotrophs.
• Organisms, such as animals, that must obtain
energy from the foods they consume are
heterotrophs.
• Producer – organism that can capture energy
from sunlight or chemicals and use it to
produce food from inorganic compounds;
also known as an autotroph
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8-1 Energy and Life
ATP
Draw and label an ATP molecule.
What is the function of ATP?
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8-1 Energy and Life
Chemical Energy and ATP
ATP ( adenosine triphosphate) is used by all
types of cells as their basic energy source
ATP consists of:
• adenine
• ribose (a 5-carbon sugar)
• 3 phosphate groups
Adenine
Ribose
3 Phosphate groups
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ATP
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8-1 Energy and Life
Chemical Energy and ATP
Storing Energy
ADP has two phosphate groups instead of three.
A cell can store small amounts of energy by adding
a phosphate group to ADP.
ATP
ADP
+
Adenosine Diphosphate
(ADP) + Phosphate
Partially
charged
battery
Energy
Energy
Fully
charged
battery
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Adenosine Triphosphate (ATP)
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8-1 Energy and Life
Chemical Energy and ATP
Releasing Energy
Energy stored in ATP is released by breaking the
chemical bond between the second and third
phosphates.
2 Phosphate groups
P
ADP
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8-1 Energy and Life
Chemical Energy and ATP
The energy from ATP is needed for many cellular
activities, including active transport across cell
membranes, protein synthesis and muscle contraction.
Cells can regenerate ATP from ADP as needed by
using the energy in foods like glucose.
ATP’s characteristics make it useful as the basic
energy source of all cells.
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8-1 Energy and Life
chloroplast
Draw a green leaf with your hand.
Inside the leaf, draw, label, and color a chloroplast.
Include the following structures/labels.
•
Granum
•
Stroma
•
Thylakoids
•
Thylakoid membrane
Answer the following questions:
What are the two stages/steps of photosynthesis?
Where in the chloroplast do they occur?
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