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High School Level
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Mary Pyo, M.A.
80
35:18
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Nancy Fung, M.Ed.
62
19:30
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Eric Smith
61
18:58
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Dr. Carleen Eaton, M.D.
63
22:45
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Dr. Carleen Eaton, M.D.
72
34:11
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Mary Pyo, M.A.
89
58:08
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Dr. William Murray, Ph.D.
23
15:23
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58:54
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Prof. Vincent Selhorst-Jones
89
58:54
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Prof. Raffi Hovasapian
66
44:00
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Prof. John Zhu, M.B.A.
33
8:39
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Prof. Sandahl Nelson
18
15:04
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49
36:33
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16:23
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30:47
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39
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Dr. William Murray, Ph.D.
23
12:09
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Prof. Raffi Hovasapian
43
23:37
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23:32
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30
26:33
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Dr. Franklin Ow, Ph.D.
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16:21
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35:20
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60:26
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46:39
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54:03
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22:46
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92
24:35
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29
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Prof. Dan Fullerton, M.S.
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35
86:03
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40
48:11
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27
19:01
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37
24:56
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60
55:40
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23:21
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44
20:01
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14
14:49
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Prof. Michael Wheeler
31
12:04
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Charles Schallhorn, M.Ed.
68
39:04
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Prof. Jibin Park
26
16:17
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Prof. Jibin Park
27
16:51
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21
17:17
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Prof. Elizabeth Turro
63
48:20
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Prof. Ronald Schooler
70
37:05
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22
11:24
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18
8:36
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Prof. Alvin Sylvain, M.S.
16
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16
12:30
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23
12:20
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10
5:30
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25
12:34
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10
5:54
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42
22:47
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47
23:43
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26:29
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Prof. Rebekah Hendershot
32
8:55
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Prof. Rebekah Hendershot
28
6:01
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Prof. Joel Gonzaga
32
11:18
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Prof. Rebekah Hendershot
10
2:28
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Prof. Rebekah Hendershot
28
6:38
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Prof. Rebekah Hendershot
35
18:14
Shakespeare: Plays & Sonnets
Prof. Rebekah Hendershot
17
7:16
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Prof. Joel Gonzaga
29
7:13
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AP Spanish
Prof. Patricia Ponce de Leon
18
9:58
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AP Studio Art 2-D
Jessica Spinella
21
3:46
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Prof. Laura Ryan, M.A.
20
9:31
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Prof. Laura Ryan, M.A.
27
10:56
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Dr. Cory Hills
29
7:22
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Riley Weller (GratuiTous)
25
2:07
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Riley Weller (GratuiTous)
19
4:13
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Riley Weller (GratuiTous)
19
2:09
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Riley Weller (GratuiTous)
29
2:41
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Riley Weller (GratuiTous)
17
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Riley Weller (GratuiTous)
15
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Riley Weller (GratuiTous)
6
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Riley Weller (GratuiTous)
5
0:34
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Riley Weller (GratuiTous)
8
0:58
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Riley Weller (GratuiTous)
24
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Riley Weller (GratuiTous)
27
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Riley Weller (GratuiTous)
20
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Riley Weller (GratuiTous)
26
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Riley Weller (GratuiTous)
9
1:50
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Riley Weller (GratuiTous)
15
2:11
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Riley Weller (GratuiTous)
10
1:10
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Riley Weller (GratuiTous)
13
1:27
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AP (Advanced Placement)
AP US History
Prof. Elizabeth Turro
63
48:20
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Prof. Ronald Schooler
70
37:05
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21
17:17
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Prof. Jibin Park
26
16:17
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27
16:51
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Prof. Rebekah Hendershot
28
6:38
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Prof. Rebekah Hendershot
35
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Jessica Spinella
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3:46
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Prof. Patricia Ponce de Leon
18
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Charles Schallhorn, M.Ed.
68
39:04
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Dr. Carleen Eaton, M.D.
60
55:40
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70
60:26
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Prof. Dan Fullerton, M.S.
92
24:35
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Dr. Radi Jishi, Ph.D.
35
86:03
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Prof. Dan Fullerton, M.S.
29
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Prof. Dan Fullerton, M.S.
26
14:27
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Dr. Radi Jishi, Ph.D.
40
48:11
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Dr. Radi Jishi, Ph.D.
32
41:08
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Prof. Tom Quayle, M.S.
25
12:34
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Prof. Bryan Cardella, M.Ed.
29
23:21
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Prof. Raffi Hovasapian
66
44:00
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Prof. John Zhu, M.B.A.
33
8:39
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Prof. Sandahl Nelson
18
15:04
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DNA Replication

Changes in an organism’s DNA are rarely beneficial. One source of DNA changes is DNA replication. During DNA replication, all of an organism's DNA is copied. For humans, that means copying around 3 billion base pairs each time the DNA in a cell is replicated. Because faithful DNA replication is so important, organisms have a number of ways to ensure replication accuracy.
In this Lesson, we'll look at the details of DNA replication and how accurate replication is accomplished. We'll also discuss the consequences of DNA changes.
The structure of DNA provides an elegantly simple mechanism for DNA replication. One double-stranded DNA molecule is used to produce two identical molecules of double-stranded DNA by copying each individual strand independently.