Bio 111 Ch 8

25 July 2022
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What molecule holds instructions for the synthesis of proteins and copies itself for the next generation of cells?
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DNA
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DNA's sugar-phosphate backbones are joined with
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ionic bonds.
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Strands of DNA are joined by
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covalent bonds.
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The genome of an organism is all of its
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genetic material.
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The process by which DNA reproduces itself is
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replication.
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The enzyme that unwinds DNA is
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helicase.
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The enzyme that adds nucleotides to form new strands of DNA is
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DNA polymerase.
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Mutations may be caused by
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errors in prokaryotic replication-exposure to radiation-exposure to chemicals-errors in eukaryotic replication
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Apoptosis is also called
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programmed cell death.
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Before a cell divides, it must first duplicate its entire
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genome.
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A discrete package of super-coiled DNA and associated proteins in eukaryotes is a
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chromosome.
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A nucleosome consists of
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a stretch of DNA and histones.
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Eukaryotic chromosomes become visible with a light microscope before cell division because
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they become more tightly wound.
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One of two identical attached copies of a replicated chromosome defines the term
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chromatin.
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A part of a chromosome that attaches sister chromatids to each other defines the term
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centromere.
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DNA and associated proteins in the nucleus defines the term
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nucleosome.
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A discrete continuous molecule of condensed DNA wrapped around proteins describes the term
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histone.
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Sister chromatids are genetically identical and attached to each other at the
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centromere.
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The process by which a sperm cell combines with an egg cell is
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fertilization.
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Mitosis is used for all of the following except
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formation of gametes.
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Meiosis is a process used for
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production of gametes.
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The two main stages of the eukaryotic cell cycle are
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interphase and mitosis.
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The splitting of a cell into two daughter cells in the eukaryotic cell cycle is
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cytokinesis.
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The division of the nucleus during the eukaryotic cell cycle is
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mitosis.
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The replication of DNA during the eukaryotic cell cycle occurs during
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interphase.
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The correct sequence for the phases of the eukaryotic cell cycle is
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interphase - prophase - metaphase - anaphase - telophase - cytokinesis.
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The correct sequence for the phases of mitosis is
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prophase - metaphase - anaphase - telophase.
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The component of the cytoskeleton that attaches to the chromosomes in order to pull and separate them is the
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mitotic spindle.
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The structure that organizes the protein subunits of the mitotic spindle is the
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centromere.
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The phase of mitosis in which the nuclear envelope breaks into small pieces is
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prophase.
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The phase of mitosis in which the centromeres split and sister chromatids are pulled to opposite poles of the cell is
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anaphase.
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The phase of mitosis in which the chromosomes are aligned along the equator of the cell is
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metaphase.
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The phase of mitosis in which the nuclear envelope begins to reform around chromosomes is
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telophase.
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The phase of mitosis in which the chromosomes condense and centrosomes move to opposite poles of the cell is
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prophase.
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The first sign of cytokinesis in an animal cell is the formation of a
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cleavage furrow.
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The first sign of cytokinesis in a plant cell is the formation of a
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cell plate.
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In an asexual life cycle, cells reproduce by
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mitosis.
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In a sexual life cycle, a zygote (fertilized egg) grows to an adult by
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mitosis.
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How does the space between our fingers arise?
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The cells die by apoptosis.
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If one strand of a DNA molecule has the base sequence of 5' ATGTGCC 3' the complementary strand of DNA will read
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3' TACACGG 5'.
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If one strand of a DNA molecule has the base sequence of 5' CGGCATTA 3' the complementary strand of DNA will read
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3' GCCGTAAT 5'.
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If a mutation causes the "T" base in the base sequence 5' AGTCCG 3' to be read as a "G" base, DNA replication of the mutated sequence will read
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3' AGGCCG 5'.
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if a mutation causes the "G" base in the base sequence 5' AATGAC 3' to be read as a "T" base, DNA replication of the mutated sequence will read
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3' AATTAC 5'.
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When DNA replicates
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one strand of the original DNA ends up in each of the new DNA molecules.
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A cell condenses its DNA into ______ in preparation for mitosis.
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chromosomes
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The chemotherapy drug taxol inhibits microtubule function. A cell treated with taxol would become stuck in which phase?
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prophase
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Why don't plant cells form a cleavage furrow during cytokinesis?
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because they have a cell wall
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An asexual process used by prokaryotes in which replicated DNA and other cell parts are distributed into two daughter cells is called
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binary fission.
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Which of the following is correct about both binary fission and mitosis?
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Both are asexual forms of cell reproduction.--Both result in genetically-identical cells.--Both replicate the DNA before the cell splits.--Both result in two daughter cells.
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Binary fission produces ______ cells, mitosis produces ______ cells, and meiosis produces ______ cells.
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prokaryotic; eukaryotic body; eukaryotic sex
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Which of the following does NOT increase the risk for developing cancer?
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vigorous exercise