Lecture Campbell biology: Concepts and connections (Seventh edition) - Chapter 4: A tour of the cell

Chapter 4 - A tour of the cell. The main contents of this chapter include all of the following: Introduction to the cell, the nucleus and ribosomes, the endomembrane system, energy-converting organelles, the cytoskeleton and cell surfaces. | Chapter 4 A Tour of the Cell 0 Introduction Cells are the simplest collection of matter that can live. Cells were first observed by Robert Hooke in 1665. Working with more refined lenses, Antoni van Leeuwenhoek later described blood, sperm, and organisms living in pond water. © 2012 Pearson Education, Inc. Introduction Since the days of Hooke and Leeuwenhoek, improved microscopes have vastly expanded our view of the cell. © 2012 Pearson Education, Inc. Figure Introduction to the Cell The Nucleus and Ribosomes The Endomembrane System Energy-Converting Organelles The Cytoskeleton and Cell Surfaces Chapter 4: Big Ideas Figure Chapter 4: Big Ideas Figure Figure Cancer cells INTRODUCTION TO THE CELL © 2012 Pearson Education, Inc. Microscopes reveal the world of the cell A variety of microscopes have been developed for a clearer view of cells and cellular structure. The most frequently used microscope is the light microscope (LM)—like the | Chapter 4 A Tour of the Cell 0 Introduction Cells are the simplest collection of matter that can live. Cells were first observed by Robert Hooke in 1665. Working with more refined lenses, Antoni van Leeuwenhoek later described blood, sperm, and organisms living in pond water. © 2012 Pearson Education, Inc. Introduction Since the days of Hooke and Leeuwenhoek, improved microscopes have vastly expanded our view of the cell. © 2012 Pearson Education, Inc. Figure Introduction to the Cell The Nucleus and Ribosomes The Endomembrane System Energy-Converting Organelles The Cytoskeleton and Cell Surfaces Chapter 4: Big Ideas Figure Chapter 4: Big Ideas Figure Figure Cancer cells INTRODUCTION TO THE CELL © 2012 Pearson Education, Inc. Microscopes reveal the world of the cell A variety of microscopes have been developed for a clearer view of cells and cellular structure. The most frequently used microscope is the light microscope (LM)—like the one used in biology laboratories. Light passes through a specimen, then through glass lenses, and finally light is projected into the viewer’s eye. Specimens can be magnified up to 1,000 times the actual size of the specimen. © 2012 Pearson Education, Inc. Microscopes reveal the world of the cell Magnification is the increase in the apparent size of an object. Resolution is a measure of the clarity of an image. In other words, it is the ability of an instrument to show two close objects as separate. © 2012 Pearson Education, Inc. Microscopes reveal the world of the cell Microscopes have limitations. The human eye and the microscope have limits of resolution—the ability to distinguish between small structures. Therefore, the light microscope cannot provide the details of a small cell’s structure. © 2012 Pearson Education, Inc. Microscopes reveal the world of the cell Using light microscopes, scientists studied microorganisms, animal and plant cells, and some .

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