Slide 1 of 16 Chemistry 24.1

© Copyright Pearson Prentice Hall Slide 2 of 16 A Strategy for Life Air is composed mainly of nitrogen (N 2 ) and oxygen (O 2 ). 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. 24.1

© Copyright Pearson Prentice Hall A Strategy for Life > Slide 3 of 16 The Structure of Cells What are the two major types of cells that occur in nature? 24.1

© Copyright Pearson Prentice Hall Slide 4 of 16 A Strategy for Life > 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. 24.1

Slide 5 of 16 © Copyright Pearson Prentice Hall A Strategy for Life > The Structure of Cells Prokaryotic cells were present on Earth at least 3 billion years ago. 24.1

Slide 6 of 16 © Copyright Pearson Prentice Hall A Strategy for Life > The Structure of Cells Eukaryotic cell did not appear until about 1 billion years ago. 24.1

© Copyright Pearson Prentice Hall Slide 7 of 16 A Strategy for Life > The Structure of Cells Animation 29 Explore the complexity of chemicals essential to all life.

© Copyright Pearson Prentice Hall A Strategy for Life > Slide 8 of 16 The Energy and Carbon Cycle What compound is reduced during photosynthesis? What compounds are formed? 24.1

Slide 9 of 16 © Copyright Pearson Prentice Hall A Strategy for Life > 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. 24.1

Slide 10 of 16 © Copyright Pearson Prentice Hall A Strategy for Life > 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 (C 6 H 12 O 6 ). 24.1

Slide 11 of 16 © Copyright Pearson Prentice Hall A Strategy for Life > 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. 24.1

Slide 12 of 16 © Copyright Pearson Prentice Hall A Strategy for Life > The Energy and Carbon Cycle 24.1

© Copyright Pearson Prentice Hall Slide 13 of 16 Section Quiz -or- Continue to: Launch: Assess students’ understanding of the concepts in Section 24.1 Section Quiz

© Copyright Pearson Prentice Hall Slide 14 of Section Quiz. 1.All eukaryotic cells contain a.cell walls. b.bacteria. c.organelles. d.photosynthetic enzymes.

© Copyright Pearson Prentice Hall Slide 15 of Section Quiz. 2.One product of photosynthesis is a.ethanol. b.carbon dioxide. c.oxygen. d.water.

© Copyright Pearson Prentice Hall Slide 16 of 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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