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This activity contains 68 questions.

Question 1
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Most of an organism's DNA is carried by its _____.
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Question 2
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Who wrote that "every cell originates from another existing cell like it."?
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Question 3
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The term binary fission is best applied to _____.
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Question 4
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In bacterial cells, binary fission involves _____.
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Question 5
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A human bone marrow cell, in prophase of mitosis, contains 46 chromosomes. There are _____ chromatids.
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Question 6
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Individual chromosome placement is usually observed with a light microscope during mitosis, even though cells spend more time in interphase. This is because _____.
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Question 7
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Chromatids are _____.
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Question 8
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A cell biologist carefully measured the quantity of DNA in grasshopper cells growing in cell culture. Cells examined during the G2 phase of the cell cycle contained 200 units of DNA. What would be the amount of DNA in one of the grasshopper daughter cells?
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Question 9
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DNA replication occurs in _____.
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Question 10
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Chromatids form _____.
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Question 11
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In some organisms such as certain fungi and algae, cells undergo mitosis repeatedly without subsequently undergoing cytokinesis. What would be the consequence of this?
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Question 12
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The function of mitosis is to produce daughter cells that _____.
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Question 13
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Cytokinesis refers to _____.
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Question 14
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In the telophase of mitosis, the mitotic spindle breaks down and the chromatin uncoils. This is essentially the opposite of what happens in _____.
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Question 15
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At which point do centrosomes begin to move apart to the opposite poles of the cell in a dividing human liver cell?
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Question 16
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The phase of mitosis during which the chromosomes move toward separate poles of the cell is _____.
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Question 17
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During cell division, what role do centrosomes play?
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Question 18
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One event occurring during prophase is _____.
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Question 19
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Single sister chromatids are found in cells at mitotic _____.
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Question 20
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Which of the following is a correct representation of an event that occurs in mitosis?
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Question 21
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Which of the following occurs during mitosis?
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Question 22
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At which stage of mitosis are chromosomes lined up in one plane in preparation for their separation to opposite poles of the cell?
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Question 23
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The kinetochores _____.
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Question 24
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Consider the photograph shown below. You can determine this is a plant cell rather than an animal cell because it has _____.

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Question 25
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Cytochalasin B is a chemical that disrupts microfilament formation. This chemical would interfere with _____.
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Question 26
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A cleavage furrow forms in an animal cell during _____.
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Question 27
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Which of these factors inhibit(s) cell division?
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Question 28
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Consider the cell cycle shown below. Cells will usually divide if they receive the proper signal at a checkpoint in the _____ phase of the cell cycle.

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Question 29
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What is the difference between a benign tumor and a malignant tumor?
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Question 30
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Observations of cancer cells in culture support the hypothesis that cancer cells _____.
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Question 31
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How many pairs of autosomes do humans have?
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Question 32
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Which of the following is a normal human female?
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Question 33
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In humans, the _____ determines the sex of the offspring because _____.
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Question 34
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An example of a cell that is 2n is a(n) _____.
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Question 35
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After fertilization, the resulting zygote begins to divide by _____.
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Question 36
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When we say that an organism is haploid, we mean that _____.
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Question 37
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The diploid phase of the human life cycle begins with _____.
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Question 38
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At a critical point in meiosis, the chromosomes do not replicate. This occurs between _____.
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Question 39
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In anaphase I, _____.
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Question 40
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What is the typical result when a diploid cell undergoes meiosis?
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Question 41
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In a cell containing 10 chromosomes, meiosis results in the formation of daughter cells containing _____ chromosomes.
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Question 42
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At the end of telophase I of meiosis, as cytokinesis occurs, there are _____.
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Question 43
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Synapsis occurs during _____.
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Question 44
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During anaphase II, _____.
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Question 45
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During anaphase I, _____.
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Question 46
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Crossing over occurs during _____.
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Question 47
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An organism has a haploid chromosome number n = 4. How many tetrads will form during meiosis?
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Question 48
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Which event occurs only during prophase I of the first meiotic division?
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Question 49
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The function of meiosis is to make _____.
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Question 50
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Which of the following is a key difference between meiosis and mitosis?
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Question 51
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Mitosis and cytokinesis result in the formation of _____; meiosis and cytokinesis result in the formation of _____.
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Question 52
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Variation occurs when chromosomes are shuffled in _____.
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Question 53
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In humans, the haploid number of chromosomes is 23. Independent assortment has the possibility of producing _____ different gametes.
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Question 54
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If the diploid number of chromosomes in a certain animal is 6 (2n = 6), there are three sets of two homologous chromosomes each, or three pairs. How do these three pairs align and separate in meiosis?
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Question 55
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The major contribution of sex to evolution has been _____.
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Question 56
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Consider the two mice shown below. They have the same chromosomes, carrying genes for the same traits in the same loci, but specifying different versions of the same traits—for example, coat and eye color. These chromosomes are called _____.

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Question 57
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In the picture below, the chromosomal region where the nonsister chromatids are crossing over is called a(n) _____.

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Question 58
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Crossing over occurs during _____.
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Question 59
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Crossing over is important because it _____.
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Question 60
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Unless the chromosomes were stained to show band patterns, a karyotype would usually be unable to show _____.
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Question 61
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Consider the photograph of a karyotype. This is _____.

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Question 62
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Why are individuals with an extra chromosome 21, which causes Down syndrome, more numerous than individuals with an extra chromosome 3 or chromosome 16?
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Question 63
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Each cell in an individual with Down syndrome contains _____ chromosomes.
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Question 64
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During meiosis, homologous chromosomes sometimes "stick together" and do not separate properly. This phenomenon is known as _____.
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Question 65
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Down syndrome can be the result of _____.
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Question 66
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Which of the following indicates Turner syndrome?
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Question 67
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If a fragment of a chromosome breaks off and then reattaches to the original chromosome at the same place but in the reverse direction, the resulting chromosomal abnormality is called _____.
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Question 68
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The exchange of parts between nonhomologous chromosomes is called _____.
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