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Name ______________________________ Class ___________________ Date __________________ Skills Worksheet Directed Reading Section: Introduction to Cells Read each question, and write your answer in the space provided. 1. How and when did scientists discover cells? _______________________________________________________________ _______________________________________________________________ 2. What is the cell theory? Who formulated it and when? _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ 3. How do cells vary in shape? _______________________________________________________________ _______________________________________________________________ 4. Why is it an advantage for cells to be small? _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ In the space provided, write the letter of the description that best matches each term. _____ 5. cell membrane _____ 6. cytoplasm _____ 7. DNA _____ 8. ribosome _____ 9. organelles _____ 10. nucleus a. cell fluid and structures b. cell structure where proteins are made c. cell structures that carry out specific functions d. genetic information e. membrane-bound structure that houses a cell’s DNA f. the outer boundary of a cell Name ______________________________ Class ___________________ Date __________________ Directed Reading continued Read each question, and write your answer in the space provided. 11. What are prokaryotes, what are they like, and when did they arise? _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ 12. How do eukaryotes differ from prokaryotes? When did eukaryotes arise? _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ Write p if the cell feature is found in prokaryotes. Write e if the cell feature is found in eukaryotes. Write b if the cell feature is found in both prokaryotes and eukaryotes. _____ 13. cell membrane _____ 14. cytoplasm _____ 15. capsule _____ 16. DNA _____ 17. ribosomes _____ 18. organelles _____ 19. nucleus