The diagram below represents a hypothetical operon in the bacterium E. coli. The operon consists of two structural genes (A and B), which code for the enzymes "Aase" and "Base", respectively, and also includes P (promoter) and O (operator) regions as shown. A В When a certain compound (X) is added to the growth medium of E. coli, the separate enzymes "Aase" and "Base" are both synthesized at a 50-fold higher rate than in the absence of X. (X has a molecular weight of about 200.) Which of the following statements is true of the operon described above? The region of the A gene that codes for the carboxyl-terminal amino acid of “Aase" is near the left end of the A gene. The P region contains nucleotide sequences to which the RNA polymerase holoenzyme (including the o subunit) binds specifically but which the core enzyme does not recognize. The addition of X to the growth medium causes a repressor protein to bind tightly to the O region. The mRNA copied from this operon will be covalently linked to a short piece of DNA at the 5' end. The mRNA from this operon will contain a single "start" codon in a position corresponding to the right end of gene B.
The diagram below represents a hypothetical operon in the bacterium E. coli. The operon consists of two structural genes (A and B), which code for the enzymes "Aase" and "Base", respectively, and also includes P (promoter) and O (operator) regions as shown. A В When a certain compound (X) is added to the growth medium of E. coli, the separate enzymes "Aase" and "Base" are both synthesized at a 50-fold higher rate than in the absence of X. (X has a molecular weight of about 200.) Which of the following statements is true of the operon described above? The region of the A gene that codes for the carboxyl-terminal amino acid of “Aase" is near the left end of the A gene. The P region contains nucleotide sequences to which the RNA polymerase holoenzyme (including the o subunit) binds specifically but which the core enzyme does not recognize. The addition of X to the growth medium causes a repressor protein to bind tightly to the O region. The mRNA copied from this operon will be covalently linked to a short piece of DNA at the 5' end. The mRNA from this operon will contain a single "start" codon in a position corresponding to the right end of gene B.
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
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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Question
Transcribed Image Text:The diagram below represents a hypothetical operon in the bacterium E. coli. The operon consists
of two structural genes (A and B), which code for the enzymes “Aase" and "Base", respectively, and
also includes P (promoter) and O (operator) regions as shown.
A
В
When a certain compound (X) is added to the growth medium of E. coli, the separate enzymes
"Aase" and "Base" are both synthesized at a 50-fold higher rate than in the absence of X. (X has a
molecular weight of about 200.) Which of the following statements is true of the operon described
above?
The region of the A gene that codes for the carboxyl-terminal amino acid of “Aase" is near the left end of the
A gene.
The P region contains nucleotide sequences to which the RNA polymerase holoenzyme (including the o
subunit) binds specifically but which the core enzyme does not recognize.
The addition of X to the growth medium causes a repressor protein to bind tightly to the O region.
The mRNA copied from this operon will be covalently linked to a short piece of DNA at the 5' end.
The MRNA from this operon will contain a single "start" codon in a position corresponding to the right end of
gene B.
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