Chapter 1 - Cells: Discovery & Exploration 1 Chapter 1: Cells - Discovery & Exploration Nature of Biology 1 Chapter 1 Pages 2-21

Chapter 1 - Cells: Discovery & Exploration 2 Cells & Microscopes  Cells are the basic structural and functional units of all living things.  Although most cells are too small to be seen with the unaided eye, microscopes give enlarged images of cells and their structures.  Fig 1.4 – Examples of Cells p4

Chapter 1 - Cells: Discovery & Exploration 3

4 Cells “An Historical Overview”  Cells were first identified and named by Robert Hooke in  The Cell Theory arose in the mid 1800’s.  Cell Theory – “All living things consist of one or more organised structures that are called cells or products of cells. Cells are the basic functional unit of life.”  Quick Check Questions 2, 3,4,6,7 p9

Chapter 1 - Cells: Discovery & Exploration 5 Quick-check page 9  2. Who was credited with the discovery of the basic building blocks of life?  A: Robert Hooke  3. Who is credited with the discovery of the cell nucleus?  A: Robert Brown  4. What was the important contribution by Schleiden and Schwann to Biology?  A. They created the cell theory: All living things consist of one or more organised structures called cells or products of cells. Cells are the basic functional unit of life.

Chapter 1 - Cells: Discovery & Exploration 6 Quick Check cont…  6. Which person is more likely to have permanent damage after an accident: person A who survives after blood loss or person B who survives after some loss of brain tissue? Explain.  A. Person B. This is because blood cells are constantly replaced by the body. In contrast, brain cells are not replaced during a person’s lifetime. Therefore, person B cannot reproduce new brain cells and is more likely to have permanent damage than person A.  7. How many micrometres (µm) are there in a millimetre?  A. 1000

Chapter 1 - Cells: Discovery & Exploration 7 Tools for viewing cells  Various types of microscopes can be used to examine cells.  Light microscopes (LM’s) reveal details about the arrangement of cells and the internal structure of cells. Fig 1.9  Phase contrast microscopes allow the study of unstained living cells. Fig 1.11  Fluorescence microscopes reveal details of chemical substances present in cells. Fig 1.12

Chapter 1 - Cells: Discovery & Exploration 8 Tools for viewing cells

Chapter 1 - Cells: Discovery & Exploration 9 Tools for viewing cells  Transmission electron microscopes (TEM’s) reveal fine detail of the internal structure of cells.  Scanning electron microscopes (SEM’s) reveal details of cell surfaces.