Bio6C: DNA changes and mutations (Ch. 6 - HOLT)
Multiple Choice
Identify the
letter of the choice that best completes the statement or answers the question.
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1.
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Binary fission a. | occurs when two cells collide with each
other. | b. | produces excess energy. | c. | creates new
species. | d. | is the process by which bacteria
reproduce. | | |
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2.
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The
chromosome of a bacterium a. | is wrapped around proteins. | b. | has a circular
shape. | c. | occurs in multiple pairs within the
cell. | d. | is found within the nucleus. | | |
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3.
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Chromatids are a. | dense patches within the nucleus. | b. | bacterial
chromosomes. | c. | joined strands of duplicated genetic
material. | d. | prokaryotic nuclei. | | |
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4.
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The
chromosomes in your body a. | exist in 23 pairs in all cells but
gametes. | b. | each contain thousands of genes. | c. | form right
before cells divide. | d. | All of the above | | |
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5.
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In
order to fit within a cell, DNA becomes more compact by a. | breaking apart
into separate genes. | b. | extending to form very long, thin
molecules. | c. | wrapping tightly around associated
proteins. | d. | being enzymatically changed into a
protein. | | |
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6.
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When
a molecule of DNA is being used to direct a cell’s activities, a. | areas containing
specific active genes are extended. | b. | the areas of the molecule containing active genes become
shorter. | c. | the entire DNA molecule becomes tightly
coiled. | d. | the molecule becomes a rod-shaped structure with two
chromatids. | | |
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7.
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Homologous chromosomes are pairs of chromosomes containing genes that code
for a. | different
traits. | c. | DNA. | b. | the same traits. | d. | cytosol. | | | | |
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8.
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In
humans, gametes contain a. | 22 autosomes and 1 sex chromosome. | b. | 1 autosome and
22 sex chromosomes. | c. | 45 autosomes and 1 sex chromosome. | d. | 1 autosome and
45 sex chromosomes. | | |
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9.
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In
humans, the male determines the sex of the child because males have a. | two X
chromosomes. | c. | two Y
chromosomes. | b. | one X and one Y chromosome. | d. | 46 chromosomes. | | | | |
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10.
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The
diploid number of chromosomes in a human skin cell is 46. The number of chromosomes found in a human
ovum is
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11.
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A
diploid cell is one that a. | has two homologues of each
chromosome. | b. | is designated by the symbol
2n. | c. | has chromosomes found in pairs. | d. | All of the
above | | |
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12.
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If
nondisjunction occurs, a. | there will be too many gametes
produced. | b. | no gametes will be produced. | c. | a gamete will
receive too many or too few homologues of a chromosome. | d. | mitosis cannot
take place. | | |
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13.
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People with Down syndrome have a. | 45 chromosomes. | c. | 47 chromosomes. | b. | 46
chromosomes. | d. | no X
chromosomes. | | | | |
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14.
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A
student can study a karyotype to learn about the a. | cell cycle. | b. | genes that are
present in a particular strand of DNA. | c. | medical history of an individual. | d. | number and
structure of the chromosomes in a somatic cell. | | |
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15.
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The
stage of the cell cycle that occupies most of the cell’s life is
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16.
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Which
of the following shows the correct sequence of the cell cycle? a. | C ® M ® G1
® S ®
G2 | c. | G1
® S ® G2
® M ®
C | b. | S ® G1
® G2
® M ®
C | d. | None of the
above | | | | |
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17.
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Mitosis is the process by which a. | microtubules are assembled. | b. | cytoplasm is
divided. | c. | the nucleus is divided into two
nuclei. | d. | the cell rests. | | |
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18.
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Normal cells become cancer cells when a. | regulation of
cell growth and division is lost. | b. | cells do not respond normally to control
mechanisms. | c. | cells continue to divide without passing through
G1. | d. | All of the
above | | |
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19.
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The
phase of mitosis that is characterized by the arrangement of all chromosomes along the equator of the
cell is called a. | telophase. | c. | anaphase. | b. | metaphase. | d. | prophase. | | | | |
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20.
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As a
result of mitosis, each of the two new cells produced from the parent cell during
cytokinesis a. | receives a few
chromosomes from the parent cell. | b. | receives an exact copy of all the chromosomes present in the
parent cell. | c. | donates a chromosome to the parent
cell. | d. | receives exactly half the chromosomes from the parent
cell. | | |
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21.
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Refer
to the illustration above. Mitosis begins with the stage shown in diagram
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22.
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Refer
to the illustration above. Which of the following correctly indicates the order in which these events
occur? a. | A, B, C,
D | c. | B, A, C,
D | b. | C, B, A,
D | d. | A, C, B,
D | | | | |
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23.
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Refer
to the illustration above. During which stage do the centromeres divide?
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24.
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5
steps: the cell cycle :: a. | 6 steps : prophase | c. | 3 steps : meiosis | b. | 9 steps :
cytokinesis | d. | 4 steps :
mitosis | | | | |
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25.
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Cytokinesis in plant cells involves the formation of a. | replicated
chromosomes. | c. | spindle
fibers. | b. | a cell plate. | d. | centrioles. | | | | |
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