Name Class Date. 2. What does making new cells allow you to do? a. grow b. sleep c. eat d. make food
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1 Skills Worksheet Directed Reading B Section: The Cell Cycle 1. Your body makes new cells to replace what? a. cells that are growing bigger b. cells that are multiplying c. cells that have died d. cells that are healthy 2. What does making new cells allow you to do? a. grow b. sleep c. eat d. make food THE LIFE OF A CELL 3. When does the cell cycle begin? a. when the cell is formed b. when the cell uses energy c. when the cell divides d. when the cell uses oxygen 4. When does the cell cycle end? a. when the cell is formed b. when the cell uses energy c. when the cell divides d. when the cell uses oxygen Holt Science and Technology 21 The Cell in Action
2 5. What is the hereditary material inside a cell called? a. nuclei b. water c. DNA d. ATP 6. In what structures can cells DNA be found? a. bacteria b. water c. fluids d. chromosomes Making More Prokaryotic Cells Read the words in the box. Read the sentences. Fill in each blank with the word or phrase that best completes the sentence. circular binary fission DNA 7. Prokaryotic cells, which do not have a nucleus, have one DNA molecule. 8. Prokaryotic cells such as bacteria divide by 9. When binary fission is complete, each new cell has an identical copy of. Holt Science and Technology 22 The Cell in Action
3 Eukaryotic Cells and Their DNA 10. How many chromosomes do humans have? a. 8 b. 48 c. 32 d What are pairs of similar chromosomes called? a. prokaryotic pairs b. homologous chromosomes c. DNA d. eukaryotic pairs Making More Eukaryotic Cells 12. How many stages does a eukaryotic cell cycle have? a. two b. three c. four d. five 13. When chromosomes are copied, what are the two copies called? a. DNA b. centromeres c. chromatids d. mitosis 14. When the chromosomes separate, what is the process called? a. mitosis b. copying c. parting d. duplicating Holt Science and Technology 23 The Cell in Action
4 15. What does a cell do in the third stage of the cell cycle? a. dies b. divides into two identical cells c. makes food d. takes in oxygen MITOSIS AND THE CELL CYCLE Use the figure below to answer questions 16 through 19. Circle the letter of the best answer for each question. 16. Look at the figure. When does mitosis begin and the chromosomes condense into rodlike structures? 17. Look at the figure. When do the chromatids separate and move to opposite sides of the cell? 18. Look at the figure. When does a nuclear membrane form around each set of chromosomes, completing mitosis? 19. Look at the figure. When do the chromosomes line up and the homologous chromosomes pair up? Holt Science and Technology 24 The Cell in Action
5 Cytokinesis 20. What is it called when the cytoplasm of a cell divides? a. mitosis b. interphase c. cytokinesis d. cell plates 21. What does the cell membrane do during cytokinesis in an animalcell? a. pinches in two b. forms a cell plate c. makes copies of its DNA d. shrivels up 22. What forms between the two new cells during plant cell cytokinesis? a. cell plate b. mitochondrion c. chromatid d. water Holt Science and Technology 25 The Cell in Action
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