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 This activity contains 68 questions.

Question 1
1
Open Hint for Question 1 in a new window		 Most of an organism's DNA is carried by its _____.
 
End of Question 1


Question 2
2
Open Hint for Question 2 in a new window		 Who wrote that "every cell originates from another existing cell like it."?
 
End of Question 2


Question 3
3
Open Hint for Question 3 in a new window		 The term binary fission is best applied to _____.
 
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Question 4
4
Open Hint for Question 4 in a new window		 In bacterial cells, binary fission involves _____.
 
End of Question 4


Question 5
5
Open Hint for Question 5 in a new window		 A human bone marrow cell, in prophase of mitosis, contains 46 chromosomes. There are _____ chromatids.
 
End of Question 5


Question 6
6
Open Hint for Question 6 in a new window		 Individual chromosome placement is usually observed with a light microscope during mitosis, even though cells spend more time in interphase. This is because _____.
 
End of Question 6


Question 7
7
Open Hint for Question 7 in a new window		 Chromatids are _____.
 
End of Question 7


Question 8
8
Open Hint for Question 8 in a new window		 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
9
Open Hint for Question 9 in a new window		 DNA replication occurs in _____.
 
End of Question 9


Question 10
10
Open Hint for Question 10 in a new window		 Chromatids form _____.
 
End of Question 10


Question 11
11
Open Hint for Question 11 in a new window		 In some organisms such as certain fungi and algae, cells undergo mitosis repeatedly without subsequently undergoing cytokinesis. What would be the consequence of this?
 
End of Question 11


Question 12
12
Open Hint for Question 12 in a new window		 The function of mitosis is to produce daughter cells that _____.
 
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Question 13
13
Open Hint for Question 13 in a new window		 Cytokinesis refers to _____.
 
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Question 14
14
Open Hint for Question 14 in a new window		 In the telophase of mitosis, the mitotic spindle breaks down and the chromatin uncoils. This is essentially the opposite of what happens in _____.
 
End of Question 14


Question 15
15
Open Hint for Question 15 in a new window		 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
16
Open Hint for Question 16 in a new window		 The phase of mitosis during which the chromosomes move toward separate poles of the cell is _____.
 
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Question 17
17
Open Hint for Question 17 in a new window		 During cell division, what role do centrosomes play?
 
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Question 18
18
Open Hint for Question 18 in a new window		 One event occurring during prophase is _____.
 
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Question 19
19
Open Hint for Question 19 in a new window		 Single sister chromatids are found in cells at mitotic _____.
 
End of Question 19


Question 20
20
Open Hint for Question 20 in a new window		 Which of the following is a correct representation of an event that occurs in mitosis?
 
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Question 21
21
Open Hint for Question 21 in a new window		 Which of the following occurs during mitosis?
 
End of Question 21


Question 22
22
Open Hint for Question 22 in a new window		 At which stage of mitosis are chromosomes lined up in one plane in preparation for their separation to opposite poles of the cell?
 
End of Question 22


Question 23
23
Open Hint for Question 23 in a new window		 The kinetochores _____.
 
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Question 24
24
Open Hint for Question 24 in a new window		 Consider the photograph shown below. You can determine this is a plant cell rather than an animal cell because it has _____.

Figure_08-07B.jpg
 
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Question 25
25
Open Hint for Question 25 in a new window		 Cytochalasin B is a chemical that disrupts microfilament formation. This chemical would interfere with _____.
 
End of Question 25


Question 26
26
Open Hint for Question 26 in a new window		 A cleavage furrow forms in an animal cell during _____.
 
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Question 27
27
Open Hint for Question 27 in a new window		 Which of these factors inhibit(s) cell division?
 
End of Question 27


Question 28
28
Open Hint for Question 28 in a new window		 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.

Figure_08-09A.jpg
 
End of Question 28


Question 29
29
Open Hint for Question 29 in a new window		 What is the difference between a benign tumor and a malignant tumor?
 
End of Question 29


Question 30
30
Open Hint for Question 30 in a new window		 Observations of cancer cells in culture support the hypothesis that cancer cells _____.
 
End of Question 30


Question 31
31
Open Hint for Question 31 in a new window		 How many pairs of autosomes do humans have?
 
End of Question 31


Question 32
32
Open Hint for Question 32 in a new window		 Which of the following is a normal human female?
 
End of Question 32


Question 33
33
Open Hint for Question 33 in a new window		 In humans, the _____ determines the sex of the offspring because _____.
 
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Question 34
34
Open Hint for Question 34 in a new window		 An example of a cell that is 2n is a(n) _____.
 
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Question 35
35
Open Hint for Question 35 in a new window		 After fertilization, the resulting zygote begins to divide by _____.
 
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Question 36
36
Open Hint for Question 36 in a new window		 When we say that an organism is haploid, we mean that _____.
 
End of Question 36


Question 37
37
Open Hint for Question 37 in a new window		 The diploid phase of the human life cycle begins with _____.
 
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Question 38
38
Open Hint for Question 38 in a new window		 At a critical point in meiosis, the chromosomes do not replicate. This occurs between _____.
 
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Question 39
39
Open Hint for Question 39 in a new window		 In anaphase I, _____.
 
End of Question 39


Question 40
40
Open Hint for Question 40 in a new window		 What is the typical result when a diploid cell undergoes meiosis?
 
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Question 41
41
Open Hint for Question 41 in a new window		 In a cell containing 10 chromosomes, meiosis results in the formation of daughter cells containing _____ chromosomes.
 
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Question 42
42
Open Hint for Question 42 in a new window		 At the end of telophase I of meiosis, as cytokinesis occurs, there are _____.
 
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Question 43
43
Open Hint for Question 43 in a new window		 Synapsis occurs during _____.
 
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Question 44
44
Open Hint for Question 44 in a new window		 During anaphase II, _____.
 
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Question 45
45
Open Hint for Question 45 in a new window		 During anaphase I, _____.
 
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Question 46
46
Open Hint for Question 46 in a new window		 Crossing over occurs during _____.
 
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Question 47
47
Open Hint for Question 47 in a new window		 An organism has a haploid chromosome number n = 4. How many tetrads will form during meiosis?
 
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Question 48
48
Open Hint for Question 48 in a new window		 Which event occurs only during prophase I of the first meiotic division?
 
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Question 49
49
Open Hint for Question 49 in a new window		 The function of meiosis is to make _____.
 
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Question 50
50
Open Hint for Question 50 in a new window		 Which of the following is a key difference between meiosis and mitosis?
 
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Question 51
51
Open Hint for Question 51 in a new window		 Mitosis and cytokinesis result in the formation of _____; meiosis and cytokinesis result in the formation of _____.
 
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Question 52
52
Open Hint for Question 52 in a new window		 Variation occurs when chromosomes are shuffled in _____.
 
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Question 53
53
Open Hint for Question 53 in a new window		 In humans, the haploid number of chromosomes is 23. Independent assortment has the possibility of producing _____ different gametes.
 
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Question 54
54
Open Hint for Question 54 in a new window		 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
55
Open Hint for Question 55 in a new window		 The major contribution of sex to evolution has been _____.
 
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Question 56
56
Open Hint for Question 56 in a new window		 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 _____.

Figure_08-17B.jpg
 
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Question 57
57
Open Hint for Question 57 in a new window		 In the picture below, the chromosomal region where the nonsister chromatids are crossing over is called a(n) _____.

Figure_08-18A.jpg
 
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Question 58
58
Open Hint for Question 58 in a new window		 Crossing over occurs during _____.
 
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Question 59
59
Open Hint for Question 59 in a new window		 Crossing over is important because it _____.
 
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Question 60
60
Open Hint for Question 60 in a new window		 Unless the chromosomes were stained to show band patterns, a karyotype would usually be unable to show _____.
 
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Question 61
61
Open Hint for Question 61 in a new window		 Consider the photograph of a karyotype. This is _____.

Figure_08-20A.jpg
 
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Question 62
62
Open Hint for Question 62 in a new window		 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
63
Open Hint for Question 63 in a new window		 Each cell in an individual with Down syndrome contains _____ chromosomes.
 
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Question 64
64
Open Hint for Question 64 in a new window		 During meiosis, homologous chromosomes sometimes "stick together" and do not separate properly. This phenomenon is known as _____.
 
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Question 65
65
Open Hint for Question 65 in a new window		 Down syndrome can be the result of _____.
 
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Question 66
66
Open Hint for Question 66 in a new window		 Which of the following indicates Turner syndrome?
 
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Question 67
67
Open Hint for Question 67 in a new window		 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 _____.
 
End of Question 67


Question 68
68
Open Hint for Question 68 in a new window		 The exchange of parts between nonhomologous chromosomes is called _____.
 
End of Question 68


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