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New World American PVT School مدرسة العالم الجديد األمريكية الخاصة Name:.......................................................................................... Grade: 10 Section: .......... Date:................................... Subject: Biology Topic: Mitosis and cytokinesis . I Q1. Fill in the blank with the word or phrase that best completes the sentence. 1. A chromosome is one long, continuous thread of _________ that has many genes and regulatory information. 2. Chromosomes condense at the start of mitosis so that they can be more easily ________________ between the two nuclei. 3. Chromosomes are not condensed during all stages of the cell cycle, because proteins need to be able to access _______________ during other stages of the cell cycle. 4. Cytokinesis differs between animal and plant cells. In animal cells, the membrane pinches together to form a cleavage furrow. In plant cells, the membrane cannot pinch together because of the _________________. Instead, a ___________________ is laid down between the two nuclei. This structure develops into the new cell walls and cell membranes. Q2. Circle the word that best completes the statement. 1. DNA wraps around organizing proteins called chromosomes / histones. 2. The suffix -tin indicates that something is stretched and thin. Keratin / Chromatin is the loose combination of DNA and proteins that looks sort of like spaghetti. 3. Sister chromatids meet at the centromere / telomere, which looks pinched. 4. The ends of DNA molecules form structures called centromeres / telomeres that help prevent the loss of genes. 5. Interphase prepares a cell to divide by duplicating / removing its DNA and organelles. Q3. Complete the diagram illustrating the four phases of mitosis and one phase of cytokinesis. Prophase Cytokinesis New World American PVT School مدرسة العالم الجديد األمريكية الخاصة Name:.......................................................................................... Grade: 10 Section: .......... Date:................................... Subject: Biology Topic: Mitosis and cytokinesis. II Q4. Choose the letter of the best answer. _____ 1. The processes of mitosis and cytokinesis produce two identical a. daughter cells. b. strands. c. chromosomes. d. chromatids. _____ 2. The process of organizing and condensing DNA into its compact form takes place at the start of a. interphase. b. metaphase. c. mitosis. d. cytokinesis. _____ 3. Which is the term for the group of proteins that organizes and condenses long strands of DNA into tight coils? a. telomeres b.centromeres c. chromatids d. histones _____ 4. During which phase of mitosis do sister chromatids separate from each other? a. prophase b. metaphase c. anaphase d. telophase _____ 5. Which of the following statements is true of cytokinesis? a. takes place in plant cells only b. completes the cell cycle c. organizes DNA d. occurs during prophase Q5. Answer the following questions with proper reasoning. 1. What role do histones play in a cell? __________________________________________________________________________ 2. What is a chromatid? ________________________________________________________________________ 3. During which phase of mitosis are sister chromatids separated from each other? __________________________________________________________________________ 4. Why do chromosomes condense at the start of mitosis? ____________________________________________________________________________ 5. Why are chromosomes not condensed during all stages of the cell cycle? ____________________________________________________________________________ ____________________________________________________________________________ 6. How does interphase prepare a cell to divide? _____________________________________________________________________ _____ 7.What are the four stages of mitosis? _____________________________________________________________ ____ __________________________________________________________________ New World American PVT School مدرسة العالم الجديد األمريكية الخاصة Name:.......................................................................................... Grade: 10 Section: .......... Date:................................... Subject: Biology III Topic: Mitosis and cytokinesis. Q6. Complete the following diagram as directed.
