About This Chapter
Fundamentals of Life Science - Chapter Summary
You'll review the fundamentals of life science when you work through this informative chapter. Our instructors cover these and other related subjects, such as the structure and function of the cell, in an easy-to-follow format. After you've completed these lessons, you should be ready to:
- Detail the biological organization of cells, tissues, organs and organ sstems
- Outline the basic functions and structures of the human body
- Compare cellular respiration and photosynthesis
- Discuss the carbon cycle and the nitrogen cycle
- Identify energy flow, food chains and trophic levels in an ecosystem
- Describe heredity, chromosomes and traits in genetics
- Define genetic variation and explain its sources and different types
- Differentiate between the evolutionary theories of Lamarck and Darwin
With this helpful chapter, you'll find even the most challenging topics simple and easy to follow. Our expert instructors developed these lessons to ensure your comprehension and give you confidence as you prepare for an important exam. The quizzes make excellent test prep tools, and the printable lesson transcripts make handy offline study guides that highlight the key topics you'll need to know.
1. The Cell: Structure & Function
The cell is a small, but complex structure. Take a look inside the outer plasma membrane of a cell and discover the functions of some common cellular components, including the nucleus, endoplasmic reticulum, Golgi apparatus and mitochondria, in this lesson.
2. Structure & Function in Biological Organization: Benefits & Disadvantages
This lesson will discuss biological organization in terms of cells, tissues, organs, and organ systems. It will also discuss the benefits and disadvantages of multicellular versus single-celled organisms.
3. Basic Structures & Functions of the Human Body
The human body is a complex system with structures ranging from cells to organ systems and functions ranging from waste removal to protection and defense. The structures and functions are dedicated to maintaining a state of health in the body.
4. Comparing & Contrasting Cellular Respiration & Photosynthesis
In this lesson we will compare and contrast respiration and photosynthesis by considering the major steps occurring in each process, where these processes take place, and the organisms that use these forms of metabolism.
5. Cycles of Matter: The Nitrogen Cycle and the Carbon Cycle
Matter is constantly cycled between living and nonliving parts of the environment. Processes like photosynthesis and nitrogen fixation allow the carbon and nitrogen cycles to regenerate needed substances by recycling Earth's atoms.
6. Food Chains, Trophic Levels and Energy Flow in an Ecosystem
In this lesson, you'll learn about food chains, food webs, and the different roles that organisms play in an ecosystem. You'll also learn about how energy flows through an ecosystem.
7. Genetics: Heredity, Traits & Chromosomes
We view manipulation of genes in our crops and livestock as a recent development. Yet, man has been manipulating the genetic makeup of his food for thousands of years through cultivation and breeding. This lesson will begin to help you understand how genetics works.
8. What Is Genetic Variation? - Sources, Definition & Types
Natural selection is the process that drives evolution, but what drives natural selection? Genetic variation increases the genetic diversity in and among populations, allowing for new traits to become more or less prominent in the gene pool.
9. Theories of Evolution: Lamarck vs. Darwin
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.
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