Cell Biology Chapter Four: Chemistry and Physics Connections Chapter Five: Cell Structure and Function Chapter Six: Cell Processes Chapter Seven: The.

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Cell Biology Chapter Four: Chemistry and Physics Connections Chapter Five: Cell Structure and Function Chapter Six: Cell Processes Chapter Seven: The Microscopic World

Chapter Five: Cell Structure and Function 5.1 What are Cells? 5.2 Cells: A Look Inside

Investigation 5A What is onion tissue made of? Examining Onion Tissue

5.1 What are cells? A cell is the basic unit of structure and function in a living thing. Your body is composed of billions of cells.

5.1 What are cells? You have nerve cells, skin cells, muscle cells, blood cells, and many other types as well. These are some of the types of cells found in your blood.

5.1 What are cells? Each cell in your body shares the characteristics of all living things.

5.1 Finding out about cells English scientist Robert Hooke (1635–1703) was the first to record his observations of cells. In 1663, he took a thin slice of cork and placed it under a microscope that he built himself.

5.1 Finding out about cells As microscopes improved, scientists made many discoveries. A modern fluorescent microscope enables scientists to use glowing proteins to see tiny cell parts as DNA in these mouse cells.

5.1 The cell theory The work of Hooke, Leeuwenhoek, Schleiden, Schwann, Virchow, and others led to an important theory in life science. The cell theory explains the relationship between cells and living things.

5.1 Similarities among cells In many-celled organisms like you, there are many different specialized cells. All cells share certain common characteristics.

5.1 Similarities among cells 1.All cells are surrounded by a cell membrane. 2.All cells contain organelles. 3.All cells contain cytoplasm. 4.All cells contain DNA.

5.1 Classifying cells Prokaryotic cells do not have a nucleus. Scientists believe that all life on Earth came from ancient cells of this type. Only bacteria have this type of cell.

5.1 Classifying cells Eukaryotic cells have a nucleus and membrane- covered organelles. They tend to be about ten times larger than prokaryotic cells. Animals, plants, fungi, and protists all have eukaryotic cells.

5.1 Comparing cell types

Medicine Connection Modern medicine is able to transplant many organs. A variety of cells can attack the new tissues if they don’t “match”. This causes most transplants to fail. Organ Transplants

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