Chapter Introduction How do the structures and processes of a cell enable it to survive?

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Presentation transcript:

Chapter Introduction How do the structures and processes of a cell enable it to survive?

Lesson 1 Reading Guide How did scientists’ understanding of cells develop? What basic substances make up a cell? Cells and Life

Lesson 1 Reading Guide cell theory macromolecule nucleic acid protein Cells and Life lipid carbohydrate

Lesson 1 English scientist Robert Hooke first identified cells over 300 years ago while looking at cork under a microscope he built. After Hooke’s discovery, other scientists began to use better microscopes to identify different structures in the cells of plants and animals. Understanding Cells

Lesson 1 Cell theoryCell theory includes three principles. Getty Images

Lesson 1 Understanding Cells (cont.) How did scientists’ understanding of cells develop?

Lesson 1 The main ingredient in any cell is water. A water molecule has two areas: The negative (–) end can attract the positive part of another substance. The positive (+) end can attract the negative part of another substance. Basic Cell Substances

Lesson 1 Water and salt both have positive and negative parts. Basic Cell Substances (cont.) FoodCollection/SuperStock

Lesson 1 Basic Cell Substances (cont.) MacromoleculesMacromolecules are necessary substances in cells, formed by joining many small molecules together. macromolecule from Greek makro–, means “long”; and Latin molecula, means “mass”

Lesson 1 There are four types of macromolecules in cells: Nucleic acids are macromolecules that form when long chains of molecules called nucleotides join together.Nucleic acids Proteins are long chains of amino acid molecules.Proteins Basic Cell Substances (cont.)

Lesson 1 Lipids are large macromolecules that do not dissolve in water.Lipids Carbohydrates store energy, provide structural support, and are needed for communication between cells.Carbohydrates Basic Cell Substances (cont.)

Lesson 1 Each type of macromolecule has unique functions in the cell.

Lesson 1 Basic Cell Substances (cont.) What basic substances make up a cell?

Lesson 1 The cell theory summarizes the main principles for understanding that the cell is the basic unit of life. Getty Images

Lesson 1 Water is the main ingredient in every cell.

Lesson 1 A nucleic acid, such as DNA, contains the genetic information for a cell.

Lesson 1 A.pond water B.skin C.cork D.plants What was Robert Hooke looking at under a microscope when he first identified molecules?

Lesson 1 A.macromolecules B.cells C.proteins D.lipids What is the term for substances formed by joining many molecules together?

Lesson 1 A.carbohydrates B.nucleic acids C.lipids D.proteins What are large macromolecules that do not dissolve in water?

Lesson 1 1.Nonliving things have cells. 2.Cells are made mostly of water. Do you agree or disagree?