CAMPBELL BIO TXT+MOD.MAST.BIO W ETEXT
10th Edition
ISBN: 9781323257937
Author: Reece
Publisher: PEARSON C
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Textbook Question
Chapter 18, Problem 6TYU
What would occur if the repressor of an inducible operon were mutated so it could not bind the operator?
- (A) irreversible binding of the repressor to the promoter
- (B) reduced transcription of the operon's genes
- (C) buildup of a substrate for the pathway controlled by the Operon
- (D) continuous transcription of the operon's genes
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Students have asked these similar questions
If glucose is not available, but lactose is available from the environment, what is the status of transcription of the lac operon genes? Explain your answer from both an evolutionary perspective and in terms of negative and positive regulation of the operon?
If you add a co-eepressor to a repressor protein and that allows it to bind the operator is this a inducible, constitutive or repressible operon?
How does tryptophan regulates its own production?
a. When tryptophan levels are high, it binds to the trp repressor, which changes its shape and binds to the operator sequence in the trp operon.
b. When tryptophan levels are high, it binds to the trp repressor, which changes its shape and binds to the promoter sequence in the trp operon.
c. When tryptophan levels are high, it binds to the trp repressor, which changes its shape and falls off from the operator sequence in the trp operon.
d. When tryptophan levels are high, it binds to the trp repressor, which changes its shape and falls off from the promoter sequence in the trp operon.
Chapter 18 Solutions
CAMPBELL BIO TXT+MOD.MAST.BIO W ETEXT
Ch. 18.1 - How does binding of the trp corepressor to the trp...Ch. 18.1 - Describe the binding of RNA Polymerase,...Ch. 18.1 - WHAT IF? A certain mutation in E. coli changes...Ch. 18.2 - In general, what are the effects of histone...Ch. 18.2 - Compare the roles of general and specific...Ch. 18.2 - WHAT IF? Suppose you compared the nucleotide...Ch. 18.2 - Once mRNA encoding a particular protein reaches...Ch. 18.3 - Compare miRNAs and siRNAs, including their...Ch. 18.3 - WH AT IF? Suppose the mRNA being degraded in...Ch. 18.4 - MAKE CONNECTIONS As you learned in Chapter 12,...
Ch. 18.4 - MAKE CONNECTIONS Explain how the signaling...Ch. 18.4 - How do fruit fly maternal effect genes determine...Ch. 18.4 - Prob. 4CCCh. 18.5 - MAKE CONNECTIONS The p53 protein can activate...Ch. 18.5 - Under what circumstances is cancer considered to...Ch. 18.5 - Prob. 3CCCh. 18 - Compare and contrast the roles of a corepressor...Ch. 18 - Describe what must happen in a cell for a gene...Ch. 18 - Why are miRNAs called noncoding RNAs? Explsin how...Ch. 18 - Describe the two main processes that cause...Ch. 18 - Compare the usual functions of proteins encoded by...Ch. 18 - If a particular operon encodes enzymes for making...Ch. 18 - Muscle cells differ from nerve cells mainly...Ch. 18 - The functioning of enhancers is an example of (A)...Ch. 18 - Cell differentiation always involves (A)...Ch. 18 - Which of the following is an example of...Ch. 18 - What would occur if the repressor of an inducible...Ch. 18 - Absence of bicoid in mRNA from a Drosophila egg...Ch. 18 - Which of the following statements about the DNA in...Ch. 18 - Within a cell, the amount of protein made using a...Ch. 18 - Prob. 10TYUCh. 18 - Prob. 11TYUCh. 18 - Prob. 12TYUCh. 18 - Prob. 13TYUCh. 18 - Prob. 14TYUCh. 18 - WRITE ABOUT A THEME: INTERACTIONS In a Short essay...Ch. 18 - SYNTHESIZE YOUR KNOWLEDGE The flashlight fish has...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- Let’s suppose you have isolated a mutant strain of E. coli in which the lac operon is constitutively expressed. In other words, the operon is turned on in the presence or absence of lactose. One possibility is that the mutation may block the transcription of the lacI gene, thereby preventing the synthesis of lac repressor. A second possibility is that the mutation could alter the sequence of the lac operon in a way that prevents the repressor protein from binding to the operator. How would you distinguish between these two possibilities?arrow_forwardWhich reaction normally happens in the regulation of the trp operon when high levels of tryptophan are present?arrow_forwardHow would each manipulation of the leader region of the trp mRNA affect transcription of the E. coli trp operon? 1. Increasing the distance (number of bases) between the leader peptide gene and sequence 2 would ___________________ transcriptional attenuation of the trp operon. (increase/decrease/not change) 2. Increasing the distance between sequences 2 and 3 would ____________________ transcriptional attenuation of the trp operon. (increase/decrease/not change) 3. Removing sequence 4 would ________________ transcriptional attenuation of the trp operon. (cause/not change/prevent) 4. Changing the two Trp codons in the leader peptide gene to His codons would cause transcriptional attenuation of the trp operon to ____________________. (lose its sensitivity to histidine/increase its sensitivity to tryptophan/lose its sensitivity to tryptophan) 5. Eliminating the ribosome‑binding site for the gene that encodes the leader peptide would cause transcriptional attenuation of the trp operon to…arrow_forward
- Let’s suppose you have isolated a mutant strain of E. coli in which the lac operon is constitutively expressed. In other words, the operon is turned on in the presence or absence of lactose. One possibility is that the mutation mayblock the transcription of the lacI gene, thereby preventing the synthesis of lac repressor. A second possibility is that the mutation could alter the sequence of the lac operator in a way that prevents lac repressor from binding to the operator. How would you distinguish between these two possibilities?arrow_forwardWhat type of mutation in an operon is most likely to affect the synthesis of more than one protein?arrow_forwardWhat would happen if the operator sequence of the lac operon contained a mutation that prevented the repressor protein from binding the operator? (Explain what would happen both in the presence and absence of lactose)arrow_forward
- According to the operon model, for the synthesis of an inducible enzyme to occur, the end-product must not be in excess an inducer must bind to the enzyme an inducer must bind to the repressor repressor must bind to the operator repressor must not be synthesizedarrow_forwardIn the presence of lactose and the promoter sequence was mutated such that the RNA polymerase can no longer bind, the structural genes will:[ Select ] ["No longer be expressed", "Be constantly expressed", "Be deleted from the operon"] In the absence of lactose and the lacI repressor gene is mutated such that the repressor protein product can no longer bind to the operator, the structural genes will: [ Select ] ["No longer be expressed", "Be constantly expressed", "Be deleted from the operon"] In the presence of lactose and the lacI repressor gene is mutated such that the repressor protein product can no longer bind to the operator, the structural genes will: [ Select ] ["No longer be expressed", "Be constantly expressed", "Be deleted from the operon"]arrow_forwardSuppose that an operon that exhibited positive control was inducible. Would the regulator gene in this case produce an active or an inactive activator protein? What would most likely turn transcription on? What about an operon with positive control that was repressible? In this case, what would turn transcription off? Explain your reasoning.arrow_forward
- If the two trp codons in the leader sequence were mutated to stop codons, what effect would it have on gene expression of that operon.arrow_forwardMutations may have an effect on the expression of the lac operon and the trp operon. Would the following mutations have a cis- or transeffect on the expression of the protein-encoding genes in the operon? A. A mutation in the operator site that prevents lac repressor from binding to it B. A mutation in the lacI gene that prevents lac repressor from binding to DNA C. A mutation in the trpL gene that prevents attenuationarrow_forwardOperon X produces three enzymes that convert Compound A to Compound B. The R gene makes the regulatory molecule for Operon X. Normally, the three enzymes are only produced when Compound B is present. However, when the R gene is mutated (no R gene is made), none of the three enzymes are produced regardless of whether Compount B is absent or present. Is this opern inducible or repressible? Does the R gene produce an activator or repressor? Is the R protein made in an active or inactive form?arrow_forward
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