Biochemistry
9th Edition
ISBN: 9781319114671
Author: Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher: W. H. Freeman
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Chapter 32, Problem 7P
Interpretation Introduction
Interpretation:
The mutation in the OR2 gene affects the likelihood of bacteriophage lambda entering the lytic state. The reason for this statement should be determined.
Concept introduction:
The lytic cycle is the rupture of the host cell, resulting in the release of a number of viruses. Bacterial viruses undergo lytic cycle only and are termed as the virulent bacteriophages. These viruses are the cause of their host cells death. Another life cycle of bacteriophage includes a lysogenic cycle. In this cycle, the viral DNA remains in the inactivated state even after various reproduction cycles of the host bacterium. After a certain time only, the viral DNA is released from the host’s cell DNA and undergoes lytic cycle.
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Regulation of Genes and Their products
1. Given the following genotypes, explain how the mutation (identified by a (-) superscript) wil affect E. coll grown in lactose medium. Will the lac operon be on or off? Will there be a complete set of gene products from the lac operon? What will be the implication of the missing gene product, if ever? Will the cell be able to survive in the lactose medium or not?
a. I+p+o+z- y+
b. i- p+o+z+y+
c. i+p+o- z+y+
d. i+p- o+z+y+
2. In terms of the trp operon, differentiate between two normal bacterial cultures, one grown in a medium supplied with tryptophan and the other medium without tryptophan.
3. Experiments show that mutations at gene E lead to non-repressible transcription of trp genes. Why?
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.
True or False. Explain.
A) At no time during protein synthesis does an amino acid make direct
contact with the mRNA being translated.
B) Because the two strands of DNA are complementary, the mRNA of a gene can be synthesized using either strand as a template.
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