Q: 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: What features vary among different types of viruses?
What features vary among different types of viruses?
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: What is meant by the term attenuation? Is it an example
What is meant by the term attenuation? Is it an example of gene regulation at the level of transcription or translation? Explain your answer.
See AnswerQ: As shown in Figure 14.12, four regions within the
As shown in Figure 14.12, four regions within the trpL mRNA can form stem-loops. Let’s suppose that mutations have been previously identified that prevent the ability of a particular...
See AnswerQ: As described in Chapter 13, enzymes known as aminoacyl-tRNA
As described in Chapter 13, enzymes known as aminoacyl-tRNA synthetases are responsible for attaching amino acids to tRNAs. Let’s suppose that in a mutant bacterium tryptophanyl-tRNA synthetase has a...
See AnswerQ: The combination of a 3–4 stem-loop and a
The combination of a 3–4 stem-loop and a U-rich attenuator in the trp operon (see Figure 14.12) is an example of a Ï-independent terminator. The function of &I...
See AnswerQ: Mutations in tRNA genes can create tRNAs that recognize stop codons.
Mutations in tRNA genes can create tRNAs that recognize stop codons. Because stop codons are sometimes called nonsense codons, these types of mutations that affect tRNAs are called nonsense suppressor...
See AnswerQ: Translational control is usually aimed at preventing the initiation of translation.
Translational control is usually aimed at preventing the initiation of translation. With regard to cellular efficiency, why do you think this is the case?
See AnswerQ: What is antisense RNA? How does it affect the translation of
What is antisense RNA? How does it affect the translation of a complementary mRNA?
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