Download Directed Reading 10.1

Name ______________________________ Class ___________________ Date __________________
Skills Worksheet
Directed Reading 10.1
Section: Cell Reproduction
Read each question, and write your answer in the space provided.
1. Why do cells reproduce in a growing organism?
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2. Why do cells reproduce in an adult organism?
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3. Why is there a limit on cell size? Give two reasons.
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4. Tell how genes and chromosomes are related.
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5. How is genetic material organized in a prokaryotic cell?
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6. What makes it challenging to package genetic material in eukaryotic cells?
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Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.
Holt Biology
1
Cell Growth and Division
Name ______________________________ Class ___________________ Date __________________
Directed Reading continued
7. What is chromatin?
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Define or describe each term. Relate each to the structure of the eukaryotic
chromosome.
8. DNA _________________________________________________________
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9. histone ________________________________________________________
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10. histone core ____________________________________________________
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11. nucleosome ____________________________________________________
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12. nucleosome cord _________________________________________________
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13. looped domain __________________________________________________
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14. chromatid ______________________________________________________
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Read each question, and write your answer in the space provided.
15. Why do chromosomes become more condensed during cell reproduction?
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Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.
Holt Biology
2
Cell Growth and Division
Name ______________________________ Class ___________________ Date __________________
Directed Reading continued
16. What are sister chromatids? What happens to them during cell division?
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Study the following steps of cell division in prokaryotes. Determine the order in
which the steps take place. Write the number of each step in the space provided.
_____ 17. A new cell wall forms around the new membrane, pushing inward.
_____ 18. The cytoplasm divides and the cell grows, doubling in size.
_____ 19. A new cell membrane forms between the two DNA copies.
_____ 20. The cell is pinched into two independent cells.
_____ 21. The cell develops a squeezed part in the middle.
_____ 22. DNA is copied.
Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor.
Holt Biology
3
Cell Growth and Division