Student Center
|
Instructor Center
|
Information Center
|
Home
Web Links
Lecture PowerPoints
Image PowerPoints
Choose a Chapter
Chapter 1
Chapter 2
Chapter 3
Chapter 4
Chapter 5
Chapter 6
Chapter 7
Chapter 8
Chapter 9
Chapter 10
Chapter 11
Chapter 12
Chapter 13
Chapter 14
Chapter 15
Chapter 16
Chapter 17
Chapter 18
Chapter 19
Chapter 20
Chapter 21
Chapter 22
Chapter 23
Chapter 24
Telomerase Function
Feedback
Help Center
Molecular Biology, 4/e
Robert F. Weaver
DNA Replication II: Detailed Mechanism
Telomerase Function
Will chromosomes remain stable of over very long periods of time?
Each round of genetic replication followed by mitosis or meiosis requires the replication of a complete version of each chromosome. Any accidental changes in chromosome structure will be permanent. These changes will be passed on through future rounds of DNA replication. Therefore any loss of DNA is a serious problem. If the end of a DNA strand is not copied each time the DNA is replicated then the chromosome will shrink continuously as the cell cycle continues. Because errors persist and accumulate over time it is very important to prevent the accumulation of DNA damage and loss.
View the animation below, then complete the quiz to test your knowledge of the concept.
1
DNA polymerases cannot replicate
A)
the 5’ end of circular chromosomes.
B)
the 3’ end of circular chromosomes.
C)
the 5’ end of linear chromosomes.
D)
the 3’ end of linear chromosomes.
E)
both the 5’ and 3’ ends of linear chromosomes.
2
Telomerase is unique because it contains
A)
a DNA molecule.
B)
an RNA molecule.
C)
different RNA molecules.
D)
different DNA molecules.
E)
both DNA and RNA molecules.
3
Which of the following best describes the function of telomerase at the telomere?
A)
It makes special primers that do not need to be removed.
B)
It synthesizes new DNA without the use of a template.
C)
It adds new DNA to both strands of the telomere overhang.
D)
It adds new DNA to the shorter strand of the telomere overhang.
E)
It adds new DNA to the longer strand of the telomere overhang.
4
Telomeres consist of direct repeat sequences.
A)
True
B)
False
5
In the absence of telomerase activity, chromosomes are shortened slightly after every round of replication.
A)
True
B)
False
2008 McGraw-Hill Higher Education
Any use is subject to the
Terms of Use
and
Privacy Policy
.
McGraw-Hill Higher Education
is one of the many fine businesses of
The McGraw-Hill Companies
.