tailieunhanh - Biology 11

In this Unit, you will discover What molecules make up cells How the cell membrane separates cells from their external environment but allows substances into and out of the cell What special functions cell structures have and how these contribute to keeping an organism alive What processes in cells capture and release the energy needed for survival and how we harness these processes Cellular Functions It has been said that we are made of the stuff of stars. What do you think this means? The pine wood cells pictured on the right and all other organisms on Earth are made mostly of only. | 1 Overall Expectations ---- ----------- In this Unit you will discover What molecules make up cells How the cell membrane separates cells from their external environment but allows substances into and out of the cell What special functions cell structures have and how these contribute to keeping an organism alive What processes in cells capture and release the energy needed for survival and how we harness these processes Unit Contents ----------- Chapter 1 Exploring the Microuniverse of the Cell. 4 Cellular Functions It has been said that we are made of the stuff of stars. What do you think this means The pine wood cells pictured on the right and all other organisms on Earth are made mostly of only six common chemical elements. These elements originated under the conditions of massive gravity and heat found in stars. Evidence that the molecules of life compounds containing carbon hydrogen and oxygen exist throughout the universe is found in comets like Hale-Bopp shown below. Scientists have recently found that such rocks travelling through space transport compounds and molecules that form the basis of life on Earth. Within cells these molecules are transformed into living organisms with a multitude of complex strategies for survival. The same few molecules are used over and over in different combinations to make literally millions of different structures and to carry out all the different functions needed by living things. The processes involved in sustaining life all begin at the molecular level within the microscopic spaces of the cell. This includes the storage and release of the energy needed to power cellular process which ultimately comes from the Sun. Chapter 2 Organizing Life . . . . 42 Chapter 3 Cells Energy and Technology. 78 Unit Investigation. 110 UNIT INVESTIGATION Look ahead to pages 110-111. You can start planning your investigation well in advance by knowing what you will need. As you work through the unit watch for ideas and materials that will .