The Chemistry of Life 1

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Transcript The Chemistry of Life 1

Chemistry 24.1
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24.1
A Strategy for Life
Air is composed mainly of nitrogen
(N2) and oxygen (O2). It is thought
that Earth’s crust changed over
time as a result of photosynthesis,
a process carried out by green
organisms such as these
cyanobacteria. You will learn about
the characteristics of living things,
including the organisms in which
photosynthesis occurs.
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24.1
A Strategy for Life
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The Structure of Cells
The Structure of Cells
What are the two major types of cells
that occur in nature?
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24.1
A Strategy for Life
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The Structure of Cells
Two major cell types occur in
nature: the cells of bacteria, known
as prokaryotic cells, and the cells of
all other organisms, known as
eukaryotic cells.
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24.1
A Strategy for Life
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The Structure of Cells
Prokaryotic cells were present on Earth at least
3 billion years ago.
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24.1
A Strategy for Life
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The Structure of Cells
Eukaryotic cell did not appear until about 1
billion years ago.
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A Strategy for Life
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The Structure of Cells
Animation 29
Explore the complexity of chemicals essential
to all life.
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24.1
A Strategy for Life
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The Energy and Carbon Cycle
The Energy and Carbon Cycle
What compound is reduced during
photosynthesis? What compounds are
formed?
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24.1
A Strategy for Life
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The Energy and Carbon Cycle
Within the chloroplast is a light-capturing system
that converts light energy into chemical energy
by a process called photosynthesis.
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24.1
A Strategy for Life
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The Energy and Carbon Cycle
Photosynthesis uses the energy from
sunlight to reduce carbon dioxide to
compounds that contain C—H bonds,
mainly in the form of glucose (C6H12O6).
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24.1
A Strategy for Life
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The Energy and Carbon Cycle
Both plants and animals get energy by
unleashing the energy stored in the chemical
bonds of carbon compounds. The nutrients are
oxidized back to carbon dioxide and water in the
process.
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A Strategy for Life
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The Energy and Carbon Cycle
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24.1 Section Quiz.
Assess students’ understanding
of the concepts in Section 24.1.
Continue to:
-or-
Launch:
Section Quiz
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24.1 Section Quiz.
1. All eukaryotic cells contain
a. cell walls.
b. bacteria.
c. organelles.
d. photosynthetic enzymes.
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24.1 Section Quiz.
2. One product of photosynthesis is
a. ethanol.
b. carbon dioxide.
c. oxygen.
d. water.
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24.1 Section Quiz.
3. Energy production within cells involves
a. the oxidation of glucose to carbon dioxide.
b. the oxidation of glucose to carbon.
c. the reduction of glucose to carbon dioxide.
d. the reduction of glucose to carbon.
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END OF SHOW