Q: A pre-mRNA with 7 exons and 6 introns is recognized
A pre-mRNA with 7 exons and 6 introns is recognized by just one splicing repressor that binds to the 3´ end of the third intron. The third intron is located between exon 3 and exon 4. After splicing i...
See AnswerQ: Under what conditions is lac repressor bound to the lac operon?
Under what conditions is lac repressor bound to the lac operon?
See AnswerQ: Why is it beneficial for the bacterium to regulate the lac operon
Why is it beneficial for the bacterium to regulate the lac operon with both a repressor protein and an activator protein?
See AnswerQ: If a repressor prevents TFIID from binding to the TATA box,
If a repressor prevents TFIID from binding to the TATA box, why does this inhibit transcription?
See AnswerQ: How are the actions of lac repressor and trp repressor similar and
How are the actions of lac repressor and trp repressor similar and how are they different with regard to their binding to operator sites, their effects on transcription, and the influences of small ef...
See AnswerQ: Transcriptional repressor proteins (e.g., lac repressor), antisense
Transcriptional repressor proteins (e.g., lac repressor), antisense RNA, and feedback inhibition are three different mechanisms that turn off the expression of genes and gene products. Which of these...
See AnswerQ: Transcriptional regulation often involves a regulatory protein that binds to a segment
Transcriptional regulation often involves a regulatory protein that binds to a segment of DNA and a small effector molecule that binds to the regulatory protein. Do each of the following terms apply t...
See AnswerQ: An operon is repressible—a small effector molecule turns off its
An operon is repressible—a small effector molecule turns off its transcription. Which combination(s) of small effector molecule and regulatory protein could be involved in this process? A. An inducer...
See AnswerQ: If an abnormal repressor protein could still bind allolactose but the binding
If an abnormal repressor protein could still bind allolactose but the binding of allolactose did not alter the conformation of the repressor protein, how would the expression of the lac operon be affe...
See AnswerQ: What are the functions of transcriptional activator proteins and repressor proteins?
What are the functions of transcriptional activator proteins and repressor proteins? Explain how they work at the molecular level.
See AnswerQ: How do the λ repressor and the cro protein affect the transcription
How do the λ repressor and the cro protein affect the transcription from PR and PRM? Explain where these proteins are binding to cause their effects.
See AnswerQ: Figure 18.11 shows a genetic switch that controls the choice
Figure 18.11 shows a genetic switch that controls the choice between the lytic and lysogenic cycles of phage λ. What is a genetic switch? Compare the roles of a genetic switch...
See AnswerQ: Mutations may have an effect on the expression of the lac operon
Mutations 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 ope...
See AnswerQ: Would a mutation that inactivated lac repressor and prevented it from binding
Would a mutation that inactivated lac repressor and prevented it from binding to the lac operator site result in the constitutive expression of the lac operon under all conditions? Explain. What is th...
See AnswerQ: Chapter 21 describes a blotting method known as Northern blotting, which
Chapter 21 describes a blotting method known as Northern blotting, which can be used to detect RNA transcribed from a particular gene or a particular operon. In this method, a specific RNA is detected...
See AnswerQ: Looking at Figure 14.10, discuss possible “molecular ways
Looking at Figure 14.10, discuss possible “molecular ways†that the cAMP-CAP complex and lac repressor may influence RNA polymerase function. In other words, try to...
See AnswerQ: Discuss the advantages and disadvantages of genetic regulation at the different points
Discuss the advantages and disadvantages of genetic regulation at the different points identified in Figure 14.1. From Figure 14.1:
See AnswerQ: Certain environmental conditions such as exposure to UV light are known to
Certain environmental conditions such as exposure to UV light are known to activate lysogenic λ prophages and cause them to progress into the lytic cycle. UV light initially causes the repressor prote...
See AnswerQ: An absentminded researcher follows the protocol described in Figure 14.7
An absentminded researcher follows the protocol described in Figure 14.7 and (at the end of the experiment) does not observe any yellow color in any of the tubes. Yikes! Which of the following mistake...
See AnswerQ: As described in experimental question E2 and also in Chapter 21,
As described in experimental question E2 and also in Chapter 21, the technique of Northern blotting can be used to detect the level of transcription of a specific RNA. Draw the results you would expec...
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