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SECIl0ftl
5.2
Date
Perlod
Name
MITOSIS AND CYTOKINESIS
Study Guide
KEY CONCEPT
Cells divlde during mitosis and
cytokinesis.
VOCABUTARY
chromosome
centromere
metaphase
histone
telomere
a
chromatin
prophase
telophase
naphase
chromatid
MAIN IDEA:
Chromosomes condense at the start of mitosis.
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What is a chromosome?
One long continuous thread of DNA that has many genes and regulatory information.
2.
Why do chromosomes condense at the start of mitosis?
So they can be more easily divided between the two nuclei.
3,
Why are chromosomes not condensed during all stages of the cell cycle?
Proteins need to be able to access genes during other stages of the cell cycle so that they can
be used to make proteins or so that the entire DNA sequence can be copied.
Refer to Figure 5,5 to sketch how DNA goes from a long stringy form to a tightly condensed
form, Label the parts of the condcnsed" duplicated chromosome,
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MAIN IDEA: Mitosis
4.
and cytokinesis produce two genetically identical daughter cells.
How does interphasç prepare a cell to divide?
During interphase, a cell duplicates its DNA and orgnelles.
Unit 2 Resource Book
McDougal Littell Biology
Study Guide 69
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STUDY GUIDE, CONTINUED
5.
Mitosis occurs in what types of cells?
Body Cells
6.
Develop a device, such as a short sentence or phrase, to help you remember the order
the steps of mitosis: prophase, metaphase, anaphase' telophase'
of
Answers will vary. Sample answer: Pat's Mom Ate Tomatoes.
Complete the diagram illustrating the four phases of mitosis and one phase of cytokinesis.
Prophase
Cytokinesis
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7. How does cytokinesis differ between plant and animal cells?
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In animal cells, the membrane pinches together, forming a cleavage furrow. In plant cells, the membrane
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cannot pinch together because of the cell wall. Instead, a cell plate is laid down between the two
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nuclei, which will develop into the new cell walls and cell membranes.
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Vocabulary Gheck
8.
9.
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DNA wraps around organizing proteins called histones
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The suffix -tin indicates that something is stretched and thin Chromatin
IS
11. The ends of DNA molecules form structures called telomeres
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, which looks pinched
that help
prevent the loss of genes,
70 Study Guide
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the loose combination of DNA and proteins that looks sort of like spaghetti
centromere
1O. Sister chromatids are held together at the
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Unìt 2 Resource Book
McDougal Littell Biology
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