BIOLOGY 12E CONNECT ACCESS CARD
12th Edition
ISBN: 9781264938513
Author: Raven
Publisher: MCG
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Textbook Question
Chapter 16, Problem 1IQ
What advantage might a bacterium gain by linking several genes into a single operon, if all of the gene products participate in a single biochemical pathway?
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Figure 5 shows the lac operon structure in Escherichia coli.
a) Name structures P, Q and R.
b) Name substance S.
c) What is the enzyme encoded by gene I. Give its function.
d) What will happen if substance S is absent in the medium?
How do repressors reduce transcription of an operon?
A) recruit RNA polymerase to promoters
B) block the ability of RNA polymerase to bind a promoter
C) break phosphodiester bonds in the DNA
D) inhibit the activity of the ribosome
Which of the following bacterial operon is not controlled by attenuation?
a) Histidine
b) Leucine
c) Arabinose
d) Tryptophan
Chapter 16 Solutions
BIOLOGY 12E CONNECT ACCESS CARD
Ch. 16.1 - Prob. 1LOCh. 16.1 - Prob. 2LOCh. 16.1 - Prob. 3LOCh. 16.2 - Explain how proteins can interact with base-pairs...Ch. 16.2 - Prob. 2LOCh. 16.3 - Prob. 1LOCh. 16.3 - Prob. 2LOCh. 16.3 - Explain control of gene expression in the trp...Ch. 16.4 - Prob. 1LOCh. 16.4 - Prob. 2LO
Ch. 16.4 - Prob. 3LOCh. 16.5 - Describe at least two kinds of epigenetic mark.Ch. 16.5 - Explain the function of chromatin-remodeling...Ch. 16.6 - Prob. 1LOCh. 16.6 - Prob. 2LOCh. 16.7 - Prob. 1LOCh. 16.7 - Prob. 2LOCh. 16 - Prob. 1DACh. 16 - What advantage might a bacterium gain by linking...Ch. 16 - Prob. 2IQCh. 16 - Prob. 3IQCh. 16 - In prokaryotes, control of gene expression usually...Ch. 16 - Prob. 2UCh. 16 - Prob. 3UCh. 16 - The lac operon is controlled by two main proteins....Ch. 16 - In eukaryotes, binding of RNA polymerase to a...Ch. 16 - In eukaryotes, the regulation of gene expression...Ch. 16 - In the trp operon, the repressor binds to DNA a....Ch. 16 - Prob. 1ACh. 16 - Specific transcription factors in eukaryotes...Ch. 16 - Repression in the trp operon and induction in the...Ch. 16 - Regulation by small RNAs and alternative splicing...Ch. 16 - Eukaryotic mRNAs differ from prokaryotic mRNAs in...Ch. 16 - In the cell cycle, cyclin proteins are produced in...Ch. 16 - A mechanism of control in E. coli not discussed in...Ch. 16 - You have isolated a series of mutants affecting...Ch. 16 - Examples of positive and negative control of...Ch. 16 - What forms of eukaryotic control of gene...Ch. 16 - The number and type of proteins found in a cell...
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- Which will be bound to the Lac Operon in an environment with lactose and glucose? A) both repressor and CAP B) repressor only C) CAP only D) neither repressor nor CAParrow_forwardAn operon that encodes enzymes that degrade ampicilin is most likely __________ . A) inducible B) under positive control C) under negative control D) repressible E) controlled by CAParrow_forwardIf a researcher moves the promoter for the lac operon to the region between the beta galactosidase (lacZ) gene and the permease (lacY) gene, which of the following results would you expect? A) The three genes of the lac operon will be expressed normally. B) The repressor will not be able to bind to the operon. C) The operon will still transcribe the lacZ and lacY genes, but the mRNA will not be translated. D) LacZ will not be transcribed and Beta galactosidase will not be produced.arrow_forward
- If tryptophan is absent from the environment of E.coli, the trp operon will be _______ A) mutated B) activated, but only partially C) activated D) repressedarrow_forwardThe lac operon contains the genes that the bacterium needs to be able to use lactose as a carbon source. What would happen to the regulation of the Lac operon if: a) a mutation has occurred in the Lac Z gene which results in the formation of no functional β-galactosidase b) a mutation has occurred in the CAP protein so that cAMP cannot bindarrow_forwardWhat are the effects of the following conditions on Lac operon of bacteria? Do not forget to mention about the role of repressor, activator, RNA polymerase in each case! A) Glucose is absent and lactose is present B) Glucose is present and lactose is present C) Glucose is present and lactose is absentarrow_forward
- High levels of transcription of the lactose operon require all of the following, EXCEPT: A) O the presence of lactose B) O high levels of CAMP (cyclic AMP) C) O the absence of glucose D) O the formation of allolactose E) O A-D are all requiredarrow_forwardThe attenuation mechanism that helps block expression of the tryptophan operon requires all of the following, except A) O MRNA transcript of the trp leader sequence B) Oaribosome stalled at the stop codon of the trp leader transcript C) O formation of an attenuator loop D) O low intracellular levels of tryptophanarrow_forwardThe lac operon in E. coli bacteria codes for proteins that break down (digest) the disaccharide lactose. Therefore, the lac operon is expressed at its highest levels when there is: A) glucose but no lactose B) lactose and glucose C) lactose but no glucose D) no glucose or lactosearrow_forward
- In their studies of Streptococcus pneumoniae, members of Avery's lab demonstrated that bacteria can pick up and use DNA from the environment. This was the first documentation of the process now known as transformation. We now know that transformation a) can transfer up to 20 genes from the environment into a bacterial cell. b) can be made permanent if the stretch of DNA includes the operator sequence from an operon. c) occurs more readily if the bacterial cells have first been infected with a temperate bacteriophage. d) requires the presence of a geno for ampicillin resistance in the stretch of DNA. e) all of the above are true of transformation O f) none of the above is correctarrow_forwardWhich of the following statements is false?a) A derivative of lactose serves as an inducer of the lac operon.b) Signal transduction provides a mechanism for a cell to sense the conditions of its external environment.c) Quorum sensing allows bacterial cells to sense the density of like cells.d) An example of a two-component regulatory system is the lactoseoperon, which is controlled by a repressor and an activator.e) An ORF is a stretch of DNA that may encode a protein.arrow_forwardThe lac operon has 4 genes, I, Z, Y and A. For each scenario, tell me the result of the mutation, what would happen if this mutant was in the presence of lactose and why. A) Lac I is mutated/not functional - B) Lac Y is mutated/not functional -arrow_forward
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