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Download Directed Reading A Section: The Characteristics of Cells
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Name Class Date Skills Worksheet Directed Reading A Section: The Characteristics of Cells (pp. 114–119) Write the letter of the correct answer in the space provided. ______ 1. What is the smallest structural and functional unit of living things? a. organ b. cell c. tissue d. atom CELLS AND THE CELL THEORY ______ 2. What did Robert Hooke build so he could see tiny objects? a. a microscope b. a telescope c. a spectrascope d. a camera ______ 3. What did Hooke call the little boxes that cork bark is made of? a. crates b. boxes c. cells d. atoms ______ 4. Why didn’t Hooke think animals were made of cells? a. Hooke couldn’t see animal cells. b. Animals do not have cells. c. Animal cells have cell walls. d. Animal cells are too dry. Finding Cells in Other Organisms ______ 5. Where did Leeuwenhoek find what he called animalcules? a. in animal blood b. in bread dough c. in cells d. in pond scum ______ 6. What are the single-celled living things found in pond water called? a. blood b. proteins c. protists d. yeast Copyright © by Holt, Rinehart and Winston. All rights reserved. Holt California Life Science 52 Cells: The Basic Units of Life Name Class Date Directed Reading A continued The Cell Theory ______ 7. What theory says that living things are made of cells? a. organic theory b. tissue theory c. structural theory d. cell theory ______ 8. According to cell theory, what is the basic piece of all living things? a. organ b. tissue c. blood d. cell ______ 9. According to cell theory, where do all cells come from? a. water b. air c. cells d. food CELL SIZE A Few Large Cells ______ 10. What is one cell that is big enough to be seen without a microscope? a. a chicken egg yolk b. a cork bark cell c. a blood cell d. a bacteria cell Many Small Cells ______ 11. What keeps a cell from getting too big? a. surface area–to-volume ratio b. size of the nucleus c. amount of fluid in the cell d. hardness of the cell wall ______ 12. What do cells use to bring in food and get rid of water? a. their outer surface b. their inner surface c. their nucleus d. their yolk Copyright © by Holt, Rinehart and Winston. All rights reserved. Holt California Life Science 53 Cells: The Basic Units of Life Name Class Date Directed Reading A continued ______ 13. How do you figure out the surface area–to-volume ratio of a cell? a. surface area ⴛ volume c. volume surface area b. surface area ⴚ volume d. surface area volume PARTS OF A CELL Use the terms from the following list to complete the sentences below. nucleus cell membrane organelles DNA cytoplasm 14. The layer that protects every cell from its environment is the . 15. The fluid inside every cell is called . 16. Structures in every cell that have specific jobs are called . 17. At some time in its life, every cell has a(n) . 18. Plant and animal cells store DNA in an organelle called a(n) . TWO KINDS OF CELLS Use the terms from the following list to complete the sentences below. eukaroytic prokaryotic 19. Cells that have a nucleus are . 20. Cells that do not have a nucleus are . Prokaryotes Write the letter of the correct answer in the space provided. ______ 21. What is a living thing with one cell and no nucleus called? a. a prokaryote b. a ribosome c. a eukaryote d. a protist Copyright © by Holt, Rinehart and Winston. All rights reserved. Holt California Life Science 54 Cells: The Basic Units of Life Name Class Date Directed Reading A continued ______ 22. What kind of molecule is the DNA of a prokaryote? a. long and circular b. short and straight c. long and spiral d. short and boxlike ______ 23. What are tiny, round organelles made mostly of protein called? a. cell membranes b. ribosomes c. cell walls d. nuclei ______ 24. What kind of cells have strong, weblike cell walls? a. prokaryotic b. eukaryotic c. archaic d. amoebas Eukaryotes ______ 25. What living things have cells with a nucleus inside a membrane? a. prokaryotes b. ribosomes c. eukaryotes d. bacteria Copyright © by Holt, Rinehart and Winston. All rights reserved. Holt California Life Science 55 Cells: The Basic Units of Life