FIGURE 19.16 Direct repair of dam- aged bases in DNA. (a) The repair of thymine dimers by photolyase. (b) The repair of methylguanine by the transfer of the methyl group to Thymine dimer CH3 SH 06-Methylguanine CH2 ONLINE ANIMATION Н. CH3 Нас. N- н- Н Н N. `NH2 Alkyltransferase alkyltransferase. CONCEPT CHECK: Which of these DNA backbone Alkyltransferase catalyzes the removal of the methyl group onto itself. repair systems is particularly valuable to plants? DNA DNA photolyase cleaves the 2 backbone bonds between the thymine dimer. CH3 Guanine На 'N' CHз Нас. -- н CH2 н Н `NH2 The normal structure of the 2 thymines is restored. The normal structure of guanine is restored. (a) Direct repair of a thymine dimer (b) Direct repair of a methylated base O=

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
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Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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FIGURE 19.16
Direct repair of dam-
aged bases in DNA.
(a) The repair of
thymine dimers by photolyase.
(b) The repair of methylguanine by
the transfer of the methyl group to
Thymine dimer
CH3
SH
06-Methylguanine
CH2
ONLINE
ANIMATION
Н.
CH3
Нас.
N-
н-
Н
Н
N.
`NH2
Alkyltransferase
alkyltransferase.
CONCEPT CHECK: Which of these
DNA
backbone
Alkyltransferase catalyzes
the removal of the methyl
group onto itself.
repair systems is particularly valuable
to plants?
DNA
DNA photolyase
cleaves the 2
backbone
bonds between
the thymine dimer.
CH3
Guanine
На
'N'
CHз
Нас.
--
н
CH2
н
Н
`NH2
The normal structure of the 2 thymines is restored.
The normal structure of guanine is restored.
(a) Direct repair of a thymine dimer
(b) Direct repair of a methylated base
O=
Transcribed Image Text:FIGURE 19.16 Direct repair of dam- aged bases in DNA. (a) The repair of thymine dimers by photolyase. (b) The repair of methylguanine by the transfer of the methyl group to Thymine dimer CH3 SH 06-Methylguanine CH2 ONLINE ANIMATION Н. CH3 Нас. N- н- Н Н N. `NH2 Alkyltransferase alkyltransferase. CONCEPT CHECK: Which of these DNA backbone Alkyltransferase catalyzes the removal of the methyl group onto itself. repair systems is particularly valuable to plants? DNA DNA photolyase cleaves the 2 backbone bonds between the thymine dimer. CH3 Guanine На 'N' CHз Нас. -- н CH2 н Н `NH2 The normal structure of the 2 thymines is restored. The normal structure of guanine is restored. (a) Direct repair of a thymine dimer (b) Direct repair of a methylated base O=
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