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Ch 2: Praxis Biology: Science Principles - Hypotheses, Theories and Change

About This Chapter

Our video lessons and quizzes can show you scientific hypotheses, theories and how ideas have changed over time. Use the information in this chapter to get ready for the Praxis Biology exam.

Praxis Biology: Science Principles - Hypotheses, Theories and Change - Chapter Summary

In this chapter's lessons, you will learn about what constitutes hypotheses, theories, predictions and laws and the differences between them. Other lessons look at how various scientific ideas, such as atomic theory and cell theory, have evolved over the years. You will also learn about notable scientists, including Louis Pasteur, Ernest Rutherford and Antonie van Leeuwenhoek, and their work. This chapter will help prepare you for Praxis Biology test by discussing the following topics:

  • Testing and disproving hypotheses
  • Using data to formulate theories
  • Early atomic theory
  • Germ theory and pasteurization
  • Development of DNA theory
  • Classification systems and how they were created
  • How our understanding of heredity and evolution developed

In these concise videos, experienced educators discuss each topic, and you can use the embedded links to review key points as many times as you need. You can assess what you've learned through the quizzes that accompany each lesson. The questions simulate ones you'll be asked on the Praxis Biology exam.

Praxis Biology: Science Principles - Hypotheses, Theories and Change Chapter Objectives

In many states, applicants for teaching licenses must pass the Praxis exam in the subject they wish to teach. The Praxis Biology: Content Knowledge exam has 150 multiple-choice questions and can be taken as a computerized test or in a paper version. There is a two-hour time limit. The exam has six sections, and the topics covered in this chapter's lessons are in section I, Basic Principles of Science. The 12 questions in section I make up 8% of the total exam.

11 Lessons in Chapter 2: Praxis Biology: Science Principles - Hypotheses, Theories and Change
Test your knowledge with a 30-question chapter practice test
Hypothesis, Theory & Law in Science

1. Hypothesis, Theory & Law in Science

In this lesson, learn how to define hypothesis, theory, and law in science. Then, discover the ways that these ideas are related to each other and how they help us to explain the universe around us.

Hypothesis Testing: Comparing the Null & Alternative Hypothesis

2. Hypothesis Testing: Comparing the Null & Alternative Hypothesis

This lesson explores the process of comparing the null and the alternative hypothesis, as well as how to differentiate between the two after your testing is done.

The Development of Scientific Theories

3. The Development of Scientific Theories

It takes quite a bit of time to develop a scientific theory, and it is a rigorous process. This lesson will describe what scientific theories are and how they are developed by scientists.

The Durability of Scientific Laws

4. The Durability of Scientific Laws

Scientific laws are durable and hold up over time. This lesson will help you understand what a scientific law is and why scientific laws are so durable.

Early Atomic Theory: Dalton, Thomson, Rutherford and Millikan

5. Early Atomic Theory: Dalton, Thomson, Rutherford and Millikan

Imagine firing a bullet at a piece of tissue paper and having it bounce back at you! You would probably be just as surprised as Rutherford when he discovered the nucleus. In this lesson, we are going to travel back in time and discuss some of the major discoveries in the history of the atom.

Major Contributors to Cell Theory

6. Major Contributors to Cell Theory

The idea that all living things are made up of cells which can only come from other living cells, is known as cell theory. In this lesson, we take a look at the scientists who helped to further its understanding.

The Germ Theory of Disease: Definition & Louis Pasteur

7. The Germ Theory of Disease: Definition & Louis Pasteur

In this lesson, we will look at one of the most influential experiments in the field of microbiology. We will learn how Louis Pasteur disproved the theory of spontaneous generation which helped lead to the development of the germ theory of disease.

What Is Pasteurization? - Definition & Common Uses

8. What Is Pasteurization? - Definition & Common Uses

This lesson will discuss pasteurization, Louis Pasteur, and mastitis. We'll focus in on how pasteurization works, what it's used on, and why it's important to your health.

Genetic Material: Definition, Structure & Function

9. Genetic Material: Definition, Structure & Function

Genetic material, also known as deoxyribonucleic acid (DNA) and ribonucleic acid (RNA), plays a fundamental role in the composition of living organisms. Learn more about the definition, structure, and function, then test your understanding with a quiz.

Carolus Linnaeus: Classification, Taxonomy & Contributions to Biology

10. Carolus Linnaeus: Classification, Taxonomy & Contributions to Biology

There are millions of species on Earth. How can we name and organize all of them without getting confused? We use a system developed in the 1700s by Carolus Linnaeus. Learn more about him and his contributions in this lesson.

Developments in Heredity, Evolution & Ecology

11. Developments in Heredity, Evolution & Ecology

Advancements in the fields of evolution, heredity, and ecology have been significant in the past couple of centuries. Here we will investigate the major developments in these fields, with emphasis on the more recent.

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
Not Taken
Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
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