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1 Biology 1 of 21

2 1-1 What Is Science? 2 of 21

3 1-1 What Is Science? What Science Is and Is Not What Science Is and Is Not What is the goal of science? 3 of 21

4 1-1 What Is Science? What Science Is and Is Not The goal of science is to: investigate and understand the natural world. explain events in the natural world. use those explanations to make useful predictions. 4 of 21

5 1-1 What Is Science? What Science Is and Is Not Science is an organized way of using evidence to learn about the natural world. Body of knowledge 5 of 21

6 1-1 What Is Science? Thinking Like a Scientist Thinking Like a Scientist Scientific thinking begins with observation. Observation is the process of gathering information about events or processes in a careful, orderly way. 6 of 21

7 1-1 What Is Science? Thinking Like a Scientist The information gathered from observations is called data. Quantitative data Qualitative data 7 of 21

8 1-1 What Is Science? Thinking Like a Scientist Scientists use data to make inferences. An inference is a logical interpretation based on prior knowledge or experience. 8 of 21

9 1-1 What Is Science? Explaining and Interpreting Evidence Explaining and Interpreting Evidence A hypothesis is a proposed scientific explanation for a set of observations. A hypothesis may be ruled out or confirmed. 9 of 21

10 1-1 What Is Science? Explaining and Interpreting Evidence Hypotheses are tested by performing controlled experiments or by gathering new data. 10 of 21

11 1-1 What Is Science? Explaining and Interpreting Evidence Researchers often work in teams to analyze, review, and critique each other s data and hypotheses. 11 of 21

12 1-1 What Is Science? Science as a Way of Knowing Science as a Way of Knowing Science is an ongoing process that involves: asking questions observing making inferences testing hypotheses 12 of 21

13 1-1 What Is Science? Science as a Way of Knowing Scientific understanding is always changing. Good scientists are skeptics who question both existing ideas and new hypotheses. 13 of 21

14 1-1 What Is Science? Science and Human Values Science and Human Values An understanding of science and the scientific approach is essential to making intelligent decisions. 14 of 21

15 1-1 What Is Science? Science and Human Values Decisions involve many factors besides scientific information, including: the society in which we live economic considerations laws moral principles Citizens decide what to do when they vote. 15 of 21

16 1 1 Continue to: - or - Click to Launch: 16 of 21

17 1 1 Observations involving numbers are known as a. qualitative observations. b. hypothetical observations. c. quantitative observations. d. inferred observations. 17 of 21

18 1 1 Which of the following shows the interaction of science and human values? a. the debate over the best way to produce electricity b. investigating how a manatee behaves c. Determining what causes a disease d. using a hypothesis to test an explanation 18 of 21

19 1 1 A scientist takes paint chips from 10 apartments in a large building. She tests for the presence of lead in the paint and finds it in all 10 samples. She then concludes that lead paint is probably present in all 120 apartments in the building. This conclusion is an example of a. a scientific fact. b. a scientific error. c. proof. d. a reasonable inference. 19 of 21

20 1 1 A possible explanation for a set of observations is known as a. data. b. a hypothesis. c. an inference. d. a result. 20 of 21

21 1 1 A good scientific hypothesis must be a. correct. b. able to be tested. c. obvious. d. based on common sense. 21 of 21

22 END OF SECTION

23 1-2 How Scientists Work 23 of 32

24 1-2 How Scientists Work Designing an Experiment How do scientists test hypotheses? A hypothesis should be tested by an experiment in which only one variable is changed at a time. 24 of 32

25 1-2 How Scientists Work Designing an Experiment Designing an Experiment The process of testing a hypothesis includes: Asking a question Forming a hypothesis Setting up a controlled experiment Recording and analyzing results Drawing a conclusion 25 of 32

26 1-2 How Scientists Work Designing an Experiment Asking a Question Many years ago, people wanted to know how living things came into existence. They asked: How do organisms come into being? 26 of 32

27 1-2 How Scientists Work Designing an Experiment Forming a Hypothesis One early hypothesis was spontaneous generation. For example, most people thought that maggots spontaneously appeared on meat. In 1668, Redi proposed a different hypothesis: that maggots came from eggs that flies laid on meat. 27 of 32

28 1-2 How Scientists Work Designing an Experiment Setting Up a Controlled Experiment manipulated variable responding variable 28 of 32

29 1-2 How Scientists Work Designing an Experiment Redi s Experiment Uncovered jars Covered jars Controlled Variables: jars, type of meat, Location, temperature, time 29 of 32

30 1-2 How Scientists Work Designing an Experiment Redi s Experiment Manipulated Variable: Gauze covering that keeps flies away from meat Several days pass. Responding Variable: whether maggots appear Maggots appear. No maggots appear. 30 of 32

31 1-2 How Scientists Work Designing an Experiment Drawing a Conclusion Scientists use the data from an experiment to evaluate a hypothesis and draw a valid conclusion. 31 of 32

32 1-2 How Scientists Work Repeating Investigations Spallanzani's Test of Redi's Findings Gravy is boiled. Gravy is boiled. 32 of 32

33 1-2 How Scientists Work Repeating Investigations Spallanzani's Test of Redi's Findings Flask is open. Flask is sealed. 33 of 32

34 1-2 How Scientists Work Repeating Investigations Spallanzani's Test of Redi's Findings Gravy is teeming with microorganisms. Gravy is free of microorganisms. 34 of 32

35 1-2 How Scientists Work Repeating Investigations Pasteur's Test of Spontaneous Generation Louis Pasteur conclusively disproved the hypothesis of spontaneous generation. Pasteur showed that all living things come from other living things. 35 of 32

36 1-2 How Scientists Work Repeating Investigations Pasteur s Experiment Broth is boiled Broth is free of microorganisms for a year. Curved neck is removed. Broth is teeming with microorganisms. 36 of 32

37 1-2 How Scientists Work Repeating Investigations The Impact of Pasteur s Work Pasteur saved the French wine industry, which was troubled by unexplained souring of wine. He began to uncover the nature of infectious diseases, showing that they were the result of microorganisms. 37 of 32

38 1-2 How Scientists Work How a Theory Develops How does a scientific theory develop? 38 of 32

39 1-2 How Scientists Work How a Theory Develops How a Theory Develops As evidence from numerous investigations builds up, a hypothesis may become so well supported that scientists consider it a theory. In science, the word theory applies to a well-tested explanation that unifies a broad range of observations. 39 of 32

40 Major Theories in Biology Germ Theory Evolutionary Theory Cell Theory Gene Theory 40 of 32

41 1 2 Continue to: - or - Click to Launch: 41 of 32

42 1 2 In an experiment, the variable that is deliberately changed is called the a. control. b. manipulated variable. c. responding variable. d. constant control 42 of 32

43 1 2 The mistaken belief that living organisms can arise from nonliving matter is called a. biogenesis. b. Pasteur's theory. c. spontaneous generation. d. Spallanzani s hypothesis. 43 of 32

44 1 2 Which of the following was the manipulated variable in Redi s experiment? a. the kind of meat used b. the temperature the jars were kept at c. the gauze covering on some jars d. the kind of fly that visited the jars 44 of 32

45 1 2 A well-tested explanation that unifies a broad range of observations is a a. hypothesis. b. variable. c. control. d. theory. 45 of 32

46 1 2 A scientific explanation does not become a theory until a. a majority of scientists agree with it. b. it has been supported by evidence from numerous investigations and observations. c. it is first proposed as an explanation. d. it is published in a textbook. 46 of 32

47 END OF SECTION

48 1-3 Studying Life 48 of 45

49 1-3 Studying Life Characteristics of Living Things What are some characteristics of living things? 49 of 45

50 1-3 Studying Life Characteristics of Living Things Living things share the following characteristics: made up of units called cells reproduce based on a universal genetic code grow and develop obtain and use materials and energy respond to their environment maintain a stable internal environment change over time 50 of 45

51 1-3 Studying Life Big Ideas in Biology Big Ideas in Biology Science as a Way of Knowing Science is not just a list of facts. The job of science is to use observations, questions, and experiments to explain the natural world. 51 of 45

52 1-3 Studying Life Big Ideas in Biology Interdependence in Nature All forms of life on Earth are connected together into a biosphere, which literally means living planet. 52 of 45

53 1-3 Studying Life Big Ideas in Biology Matter and Energy Matter serves as nutrients to build body structure and energy to fuel the processes of life. 53 of 45

54 1-3 Studying Life Big Ideas in Biology Cellular Basis of Life Organisms are composed of one or more cells, which are the smallest units that can be considered fully alive. 54 of 45

55 1-3 Studying Life Big Ideas in Biology Information and Heredity Genetic code is common, with minor variations, to every organism on Earth. That information, carried in DNA, is copied and passed from parents to offspring. 55 of 45

56 1-3 Studying Life Big Ideas in Biology Unity and Diversity of Life All living things are fundamentally alike at the molecular level, even though life takes an almost unbelievable variety of forms. 56 of 45

57 1-3 Studying Life Big Ideas in Biology Evolution In biology, evolution, or the change in living things through time, explains inherited similarities as well as the diversity of life. 57 of 45

58 1-3 Studying Life Big Ideas in Biology Structure and Function Structures evolve in ways that make particular functions possible, allowing organisms to adapt to a wide range of environments. 58 of 45

59 1-3 Studying Life Big Ideas in Biology Homeostasis An organism s ability to maintain a relatively stable internal environment. 59 of 45

60 1-3 Studying Life Big Ideas in Biology Science, Technology, and Society Science seeks to provide useful information, but only a public that truly understands science and how it works can determine how that information should be applied. 60 of 45

61 1-3 Studying Life Branches of Biology A Few Branches of Biology Zoologists Botanists Paleontologists Cell Biologists Geneticists Microbiologists Ecologists 61 of 45

62 1-3 Studying Life Branches of Biology How can life be studied at different levels? 62 of 45

63 1-3 Studying Life Branches of Biology Some of the levels at which life can be studied include: molecules cells organisms populations communities biomes the biosphere 63 of 45

64 1-3 Studying Life Branches of Biology Biosphere The part of Earth that contains all ecosystems 64 of 45

65 1-3 Studying Life Branches of Biology Ecosystem Community and its nonliving surroundings Hawk, snake, bison, prairie dog, grass, stream, rocks, air 65 of 45

66 1-3 Studying Life Branches of Biology Community Populations that live together in a defined area Hawk, snake, bison, prairie dog, grass 66 of 45

67 1-3 Studying Life Branches of Biology Population Group of organisms of one type that live in the same area Bison herd 67 of 45

68 1-3 Studying Life Branches of Biology Organism Individual living thing Bison 68 of 45

69 1-3 Studying Life Branches of Biology Groups of Cells Tissues, organs, and organ systems Nervous tissue Brain Nervous system 69 of 45

70 1-3 Studying Life Branches of Biology Cells Smallest functional unit of life Nerve cell 70 of 45

71 1-3 Studying Life Branches of Biology Molecules Groups of atoms; smallest unit of most chemical compounds Water DNA 71 of 45

72 1-3 Studying Life Biology in Everyday Life Biology in Everyday Life More than any other area of study, biology touches your life every day. How? 72 of 45

73 1-3 Continue to: - or - Click to Launch: 73 of 45

74 1-3 An increase in size is known as a. growth. b. metabolism. c. development. d. differentiation. 74 of 45

75 1-3 Which of the following is NOT a characteristic of all living things? a. use of energy b. made of cells c. stable internal environment d. need for oxygen 75 of 45

76 1-3 Which of the following are branches in the study of biology? a. cells, tissues, organs, and organisms b. botany, cell biology, ecology, and zoology c. populations, communities, and ecosystems d. the genetic code, evolution, and the biosphere 76 of 45

77 1-3 The genetic code is carried in a. Water. b. DNA. c. proteins. d. soil. 77 of 45

78 1-3 Which of the following shows the levels of organization in correct order from the simplest to the most complex? a. organisms, cells, populations, molecules, ecosystems b. ecosystems, populations, organisms, cells, molecules c. molecules, cells, organisms, populations, ecosystems d. molecules, organisms, cells, populations, ecosystems 78 of 45

79 END OF SECTION

80 1-4 Tools and Procedures 80 of 31

81 1-4 Tools and Procedures A Common Measurement System What measurement system do most scientists use? 81 of 31

82 1-4 Tools and Procedures A Common Measurement System Most scientists use the metric system when collecting data and performing experiments. 82 of 31

83 1-4 Tools and Procedures A Common Measurement System Because the metric system is based on multiples of 10, it is easy to use. 83 of 31

84 1-4 Tools and Procedures A Common Measurement System 1 meter (m) = 100 centimeters (cm) 1 meter = 1000 millimeters (mm) 1000 meters = 1 kilometer (km) 1 kilogram (kg) = 1000 grams (g) 1 gram = 1000 milligrams (mg) 1000 kilograms = 1 metric ton (t) 1 liter (L) = 1000 milliliters (ml) 1 liter = 1000 cubic centimeters (cm 3 ) 0 0 C = freezing point of water C = boiling point of water 84 of 31

85 1-4 Tools and Procedures Microscopes How are light microscopes and electron microscopes similar? How are they different? 85 of 31

86 1-4 Tools and Procedures Microscopes Microscopes Microscopes are devices that produce magnified images of structures that are too small to see with the unaided eye. 86 of 31

87 1-4 Tools and Procedures Microscopes Light Microscopes The most commonly used microscope is the light microscope. Light microscopes produce clear images of objects at a magnification of about 1000 times. 87 of 31

88 1-4 Tools and Procedures Microscopes Compound light microscopes allow light to pass through the specimen and use two lenses to form an image. 88 of 31

89 1-4 Tools and Procedures Microscopes Electron Microscopes To study even smaller objects, scientists use electron microscopes. 89 of 31

90 1-4 Tools and Procedures Laboratory Techniques Laboratory Techniques Cell Cultures A single cell is able to reproduce so that a group of cells, called a cell culture, develops from the single original cell. 90 of 31

91 1-4 Tools and Procedures Laboratory Techniques Cell Fractionation Biologists often use a technique known as cell fractionation to separate the different cell parts. 91 of 31

92 1-4 Tools and Procedures Working Safely in Biology Follow safe practices. Study the safety rules. Read all the steps and safety precautions. Follow your teacher s instructions and textbook directions exactly. If in doubt, ask your teacher for an explanation. Wash your hands thoroughly with soap and warm water after every scientific activity. 92 of 31

93 1-4 Continue to: - or - Click to Launch: 93 of 31

94 1-4 A single measurement system is commonly used in science because a. it allows scientists to easily replicate one another s experiments. b. basic units of mass, length, and volume are unrelated to one another. c. more kinds of measurements can be made. d. computers can store large amounts of scientific data. 94 of 31

95 1-4 Compared to a light microscope, an electron microscope is used to observe a. larger objects with less detail. b. larger objects with more detail. c. smaller objects with more detail. d. smaller objects with less detail. 95 of 31

96 1-4 A device that separates cell parts is a a. centrifuge. b. cell culture. c. light microscope. d. electron microscope. 96 of 31

97 1-4 A technique in which cells are grown in a nutrient solution is known as a. staining. b. cell fractionation. c. cell culturing. d. cell fertilizing. 97 of 31

98 1-4 When you work in a biology laboratory situation, your first priority should be to a. make sure all materials are available. b. modify any instructions that do not make sense. c. familiarize yourself with all safety rules before beginning to work. d. know ahead of time what kinds of results to expect. 98 of 31

99 END OF SECTION

1-3 Studying Life. Slide 1 of 45. End Show. Copyright Pearson Prentice Hall

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