Biology. Biology. Slide 1 of 30. End Show. Copyright Pearson Prentice Hall
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1 Biology Biology 1 of 30
2 7-4 The Diversity of Cellular Life 2 of 30
3 7-4 The Diversity of Cellular Life The differences among living things arise from the ways in which cells are specialized to perform certain tasks and the ways in which cells associate with one another to form multicellular organisms. 3 of 30
4 Unicellular Organisms Unicellular Organisms Unicellular organisms are made up of only one cell. Unicellular organisms dominate life on Earth. 4 of 30
5 Multicellular Organisms Multicellular Organisms Organisms that are made up of many cells are called multicellular. There is a great variety among multicellular organisms. 5 of 30
6 Multicellular Organisms What is cell specialization? 6 of 30
7 Multicellular Organisms Cells throughout an organism can develop in different ways to perform different tasks. This process is called cell specialization. 7 of 30
8 Multicellular Organisms Specialized Animal Cells Animal cells are specialized in many ways. 8 of 30
9 Multicellular Organisms Red blood cells transport oxygen. 9 of 30
10 Multicellular Organisms Cells in the pancreas produce proteins. 10 of 30
11 Multicellular Organisms Muscle cells allow movement. 11 of 30
12 Multicellular Organisms Specialized Plant Cells Plants exchange carbon dioxide, oxygen, water vapor, and other gases through tiny openings called stomata on the undersides of leaves. Highly specialized cells, known as guard cells, regulate this exchange. 12 of 30
13 Multicellular Organisms Stomata enclosed by guard cells. 13 of 30
14 Levels of Organization What are the four levels of organization in multicellular organisms? 14 of 30
15 Levels of Organization Levels of Organization The levels of organization in a multicellular organism are: individual cells tissues organs organ systems 15 of 30
16 Levels of Organization Levels of Organization Muscle cell Smooth muscle tissue Stomach Digestive system 16 of 30
17 Levels of Organization In multicellular organisms, cells are the first level of organization. 17 of 30
18 Levels of Organization Tissues Similar cells are grouped into units called tissues. A tissue is a group of similar cells that perform a particular function. 18 of 30
19 Levels of Organization 19 of 30
20 Levels of Organization Most animals have four main types of tissue: muscle epithelial nervous connective 20 of 30
21 Levels of Organization Organs Organs are groups of tissues that work together to perform a specific function. 21 of 30
22 Levels of Organization 22 of 30
23 Levels of Organization Organ Systems In most cases, an organ completes a series of specialized tasks. A group of organs that work together to perform a specific function is called an organ system. 23 of 30
24 Levels of Organization 24 of 30
25 7-4 Continue to: - or - Click to Launch: 25 of 30
26 7-4 Cell specialization is characteristic of a. bacteria. b. all unicellular organisms. c. yeasts. d. multicellular organisms. 26 of 30
27 7-4 Which of the following cells is specialized for contraction? a. muscle cell b. red blood cell c. pancreatic cell d. nerve cell 27 of 30
28 7-4 The stomach is an example of a(an) a. tissue. b. organ. c. organ system. d. organism. 28 of 30
29 7-4 Which of the following shows the levels of organization in an organism from the simplest to the most complex? a. organ system, organ, cell, tissue b. tissue, cell, organ, organ system c. cell, tissue, organ, organ system d. cell, organ, tissue, organ system 29 of 30
30 7-4 Which of the following would probably contain the greatest variety of specialized cells? a. an organ system b. a tissue c. an organ d. a multicellular organism 30 of 30
31 END OF SECTION
7-4 Notes Diversity of Cellular Life
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