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Ch 1: Holt McDougal Biology Chapter 1: Biology in the 21st Century

About This Chapter

The Biology in the 21st Century chapter of this Holt McDougal Biology Companion Course helps students learn the essential lessons associated with 21st century biology. Each of these simple and fun video lessons is about five minutes long and is sequenced to align with the Biology in the 21st Century textbook chapter.

How It Works:

  • Identify the lessons in the Holt McDougal Biology in the 21st Century chapter with which you need help.
  • Find the corresponding video lessons with this companion course chapter.
  • Watch fun videos that cover the 21st century biology topics you need to learn or review.
  • Complete the quizzes to test your understanding.
  • If you need additional help, rewatch the videos until you've mastered the material or submit a question for one of our instructors.

Students will learn:

  • What biosphere, biodiversity and ecosystems are
  • Energy transformation in living organisms
  • The definition for homeostasis
  • Evolutionary theory
  • Steps and terms of the scientific method
  • How scientific hypotheses are developed
  • Alternative vs. null hypothesis
  • Dependent vs. independent variables
  • The uses of electron and compound microscopes
  • The relationship between biology and technology
  • Applications, safety and ethics of DNA technology

Holt McDougal is a registered trademark of Houghton Mifflin Harcourt, which is not affiliated with Study.com.

15 Lessons in Chapter 1: Holt McDougal Biology Chapter 1: Biology in the 21st Century
Biosphere: Definition & Explanation

1. Biosphere: Definition & Explanation

All organisms, from the tiniest bacterium to the largest blue whale, need a place to live. The 'place on Earth's surface where life dwells' is called the biosphere. But what does this really mean? In this lesson, we'll look at the definition of the biosphere and examine how human activity is changing this important part of our planet.

What is Biodiversity? - Definition and Relation to Ecosystem Stability

2. What is Biodiversity? - Definition and Relation to Ecosystem Stability

Imagine making a list of all of the species you have ever heard of; it would be an enormous list! There are many different species on this planet. This lesson will explore the diversity of species, as well as the different types of diversity and how diversity of life is essential for maintaining healthy ecosystems.

Energy and Life: The Transformation of Energy in Living Organisms

3. Energy and Life: The Transformation of Energy in Living Organisms

While the sun is an excellent source of energy, not all forms of life can utilize the sun's energy directly. This lesson describes how plants transform the sun's energy into potential energy stored in sugar, how living organisms utilize energy in sugar to perform work, and how the relationship between photosynthesis and cellular respiration is necessary for life.

What Is an Ecosystem? - Definition & Explanation

4. What Is an Ecosystem? - Definition & Explanation

Similar to a car engine that is made up of multiple parts working together, an ecosystem has interacting parts that support a whole. But, how do we define an ecosystem and what are the components they consist of??

What Is Homeostasis? - Definition & Examples

5. What Is Homeostasis? - Definition & Examples

Homeostasis can be defined as a property of an organism or system that helps it maintain its parameters within a normal range of values. It is key to life, and failures in homeostasis can lead to diseases like hypertension and diabetes.

Theory of Evolution

6. Theory of Evolution

We'll look at the interplay between population genetics and environment. Are traits individually acquired or do entire populations evolve? The flying hamsters and a few other notable experiments will provide the answers.

The Scientific Method: Steps, Terms & Examples

7. The Scientific Method: Steps, Terms & Examples

The scientific method is more than just hypotheses and experiments. In this lesson, we'll explore the themes and variations that make up the world of science.

Developing a Scientific Hypothesis

8. Developing a Scientific Hypothesis

This video describes how to create a hypothesis and includes the three main things needed to create a strong hypothesis. You'll learn how to make a clear statement that can be both tested and measured.

Hypothesis Testing: Comparing the Null & Alternative Hypothesis

9. 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.

Identifying & Interpreting Independent & Dependent Variables

10. Identifying & Interpreting Independent & Dependent Variables

Scientists answer questions by performing experiments that have an independent variable, a dependent variable and at least one control variable. By controlling, adjusting and measuring these variables, scientists find answers to their questions.

What is an Electron Microscope? - Definition, Types & Uses

11. What is an Electron Microscope? - Definition, Types & Uses

Find out how we can observe the arrangement of atoms in a crystal, or the small features on the antenna of a wasp. In this lesson you will understand how electron microscopes work and their applications in science and technology.

Introduction to the Compound Microscope: Parts & Uses

12. Introduction to the Compound Microscope: Parts & Uses

The compound light microscope is a useful tool in any biology laboratory. In this lesson, you'll be introduced to the parts of a compound microscope, as well as understand the function of each of those parts.

How Computer-Based Technologies Influence the Study of Biology

13. How Computer-Based Technologies Influence the Study of Biology

Through the digital revolution, computers have spread into every home and workplace. Science is no exception. Learn about how computers have impacted the study of biology.

Practical Applications of DNA Technology

14. Practical Applications of DNA Technology

DNA technology is a field that has many applications for our everyday lives. In this video lesson, you will learn about some of the important contributions of DNA technology to industries such as medicine, agriculture and criminal investigation.

Ethical and Safety Concerns for DNA Technology

15. Ethical and Safety Concerns for DNA Technology

DNA technology is very powerful and has had positive influences on many fields and industries. However, DNA technology is not perfect. In this lesson, you will explore some of the safety and ethical concerns that people have regarding this field of study.

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