GED Test 2022 / 2023 For Dummies with Online Practice
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All life is composed of cells, which in turn act as building blocks for the specialized tissues and organs that make up our bodies. Although these cells perform many complex functions, you won’t need to know all the specific details when you take the GED Science test.

In the following practice questions, you start with a diagram or a passage of text, which contains all the information you’ll need to answer the question.

Practice questions

The first question refers to the following image of a human nerve cell.

Illustration courtesy of U.S. Department of Health and Human Services.
  1. The nerve cells in your body carry messages in the form of electrical signals. The signals travel from the cell body along the axon, which is protected by the


    The next question refers to the following passage.

    Cells Cells are the basic unit of all living things in the universe. Not only are flowers, weeds, and trees composed of cells, but you, your dog, and all other living things are also composed of cells. However, cells are different from organism to organism. That is why some plants produce roses and others produce dandelions and why some cells are in people and others in fish.

  2. Which of the following is not composed of cells?

    A. dogs B. flowers C. granite D. forests

Answers and explanations

  1. The correct answer is myelin sheath.

    You can see in the diagram that the axon is surrounded by the myelin sheath, a protective coating.

  2. The correct answer is Choice (C).

    All the answer choices except granite are living substances that are made up of cells. Granite is an igneous rock, not a living substance.

About This Article

This article is from the book:

About the book author:

Tim Collins, PhD, has worked in the field of education for over 40 years, and has taught learners of all ages and backgrounds. For over 25 years, he has specialized in materials development for the GED® test, and he has helped countless learners prepare for and pass this life-changing test.

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