Becker's World of the Cell (9th Edition)
9th Edition
ISBN: 9780321934925
Author: Jeff Hardin, Gregory Paul Bertoni
Publisher: PEARSON
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Chapter 19, Problem 19.2PS
Tracking a Series of Mutations. The following diagram shows the amino acids that result from mutations in the codon for a particular amino acid in a bacterial polypeptide:
(19-2)
Assume that each arrow denotes a single base-pair substitution in the bacterial DNA.
- (a) Referring to the genetic code table in Figure 18-10, determine the most likely codons for each of the amino acids and the stop signal in the diagram.
- (b) Starting with a population of mutant cells carrying the nonsense mutation, another mutant is isolated in which the premature stop signal is suppressed. Assuming wobble does not occur and assuming a single base change in the tRNA anticodon, what are all the possible amino acids that might be found in this mutant at the amino acid position in question?
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An extra piece. In one type of mutation leading to a form of
thalassemia, the mutation of a single base (G to A) generates a new 3'
3' splice site (blue in the illustration below) akin to the normal one
(yellow) but farther upstream.
Normal 3' end
of intron
5' CCTATTGGTCTATTITCCACCCITAGGCTGCTG 3'
5' CCTATTAGTCTAIIIICCACCCTTAGGCTGCTG 3'
What is the amino acid sequence of the extra segment of protein
synthesized in a thalassemic patient having a mutation leading to
aberrant splicing? The reading frame after the splice site begins with
TCT.
Translation. Write the anti-codon sequence of the MRNA transcript. Translate the
MRNA transcript into peptide sequence using both the 3 letter abbreviation and 1 letter
abbreviation.
ANTI-CODON
3'
5'
SEQUENCE
AMINO ACID
N-
C-
SEQUENCE (3 letter terminus
Abbreviation)
Terminus
AMINO ACID
N-
C-
SEQUENCE (1 letter terminus
Abbreviation)
Terminus
Be sure to answer all parts.
Write a possible mRNA sequence that codes for each peptide.
a. His-Cys-Tyr-Val-Ser
5¹-
b. Phe-Val-Thr-Tyr-Glu
5'-
5'-
c. Trp-Phe-Asn-Gln
-3'
U
-3'
с
Table 26.2 The Genetic Code-Triplets in Messenger RNA
First Base
(5' end)
-3'
U
UUU
UUC
UUA
UUG
CUU
CUC
CUA
CUG
AUL
Phe
Phe
Leu
Leu
Leu
Leu
Leu
Leu
la
C
UCU
UCC
UCA
UCG
CCU
CCC
CCA
CCG
Second Base
A
UAU
UAC
UAA
UAG
CAU
CAC
CAA
CAG
Ser
Ser
Ser
Ser
Pro
Pro
Pro
Pro
Tyr
55
Tyr
Stop
Stop
His
His
Gin
Gin
G
UGU
UGC
UGA
UGG
CGU
CGC
CGA
CGG
Cys
Cys
Stop
Trp
Arg
Arg
Arg
Arg
Third Base
(3¹ ond)
DUAC DU AG
с
А
А
Chapter 19 Solutions
Becker's World of the Cell (9th Edition)
Ch. 19 - Suppose a tRNA has the anticodon 3-CGU-5. What two...Ch. 19 - Kanamycin is an antibiotic that binds to bacterial...Ch. 19 - You are working in a lab to identify new alleles...Ch. 19 - Suppose you are using GFP fusion proteins to study...Ch. 19 - Enzymes can undergo allosteric regulation or...Ch. 19 - Suppose you use molecular biology techniques to...Ch. 19 - Prob. 19.1PSCh. 19 - Tracking a Series of Mutations. The following...Ch. 19 - Prob. 19.3PSCh. 19 - Prob. 19.4PS
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