Chapter 7.1 CELLS Worksheet

 

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Chapter er 7 Cell Struct Structure ure and Functio Function n Chapt

Sect Se ction ion 7–1 7–1 Life Life Is Is C Cel ellul lular  ar  (pages 169–173) TEKS FOCUS:

3F History of biology and contributions of scientists; 4A Parts of prokaryotic and

eukaryotic cells

This section explains what the cell theory is. It also describes the characteristics of two categories of cells, prokaryotes and eukaryotes.

Introduction

(page 169)

1. What is the structur structuree that makes up every living thing? The cell

The Discovery of the Cell

(pages 169–170)

2. What was Anton van Leeuwenhoek one of the first to see in the 1600s? He saw tiny living organisms in a drop of water.

3. What did a thin slice of cork seem like to Robert Hooke when he observed it

through a microscope? The cork seemed to be made of tiny empty chambers. 4. What did the German botanist Matthias Schleiden conclude? He concluded that all plants are made of cells.

5. What did the German biologist Theodor Schwann conclude? He concluded that animals were also made of cells.

6. How did Rudolph Virchow summarize his years of work? He stated that new cells could be produced only from the division of existing cells.

7. What are the three concepts that make up the cell theory? a.  All living things are composed of cells. b. Cells are the basic units of structure and function in living things. c. New cells are produced from existing cells.

Exploring the Cell

(pages 170–172)

8. Why are electron microscopes capable of revealing details much smaller than those

seen through light microscope microscopes? s? The wavelengths of electrons are much shorter than those of light.

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Guided Reading and Study Workbook/Chapter 7

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Prokaryotes and Eukaryotes

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(pages 172–173)

9. Circle the letter of each sentence that is true about prokaryotes. a. They grow and reproduce. b. Many are large, multicellular organisms. c. They are more complex than cells of eukaryotes. d. They have cell membranes and cytoplasm. No, some live solitary lives as single-

10. Are all eukaryotes large, multicellular organisms? celled organisms.

11. Complete the table about the two categories of cells. TWO CATEGORIES OF CELLS Category

Definition

Examples

Prokaryotes

Organisms whose cells lack nuclei

Bacteria

Eukaryotes

Organisms whose cells contain nuclei

Plants, animals, fungi, protists

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Guided Reading and Study Workbook/Chapter 7

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