Which of the following statements about operons are true? (Check all that apply) Operons are common in eukaryotes, but rare in prokaryotes. An operon encodes multiple (different) proteins. An operon encodes multiple (different) RNAs. An operon contains multiple promoters. The RNA produced from an operón contains more than one Shine-Dalgarno sequence. Operons often contain genes that function in a similar process so they are all turned on or turned off together. In other words, a mechanism to "coordinate" gene expression. >

Which of the following statements about operons are true? (Check all that apply) Operons are common in eukaryotes, but rare in prokaryotes. An operon encodes multiple (different) proteins. An operon encodes multiple (different) RNAs. An operon contains multiple promoters. The RNA produced from an operón contains more than one Shine-Dalgarno sequence. Operons often contain genes that function in a similar process so they are all turned on or turned off together. In other words, a mechanism to "coordinate" gene expression. >

Biology (MindTap Course List)

11th Edition

ISBN:9781337392938

Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Publisher:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Chapter14: Gene Regulation

Section: Chapter Questions

Problem 11TYU

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Describe operons in your own words, as if you were explaining what an operon is to someone who knew about DNA and cells etc but did not know what an operon was. Here are some things you can discuss: Are operons controlling transcription or translation? Which organisms are they found in? What do the genes in an operon have in common with each other?
Match each of the following mechanisms with how it can change the levels of gene products--whether on different operons or within the same operon. Different promoters might have different DNA sequences Translation initiation sequences can cause different open reading 1. Differences in mRNA levels BETWEEN operons frames to be translated 2. Differences in protein levels WITHIN an operon differently. The secondary structures of MRNA can differ which can change the rate of degradation of transcripts.
Which of the following is true about the Lac operon? Group of answer choices An operon with a constitutive operator (O^C mutation) will transcribe in the presence of a super repressor It is a positive repressible operon that is influenced mainly by fluctuations in glucose levels Produces a large quantity of tryptophan in order to synthesize lactase It is found in eukaryotes and is responsible for creating an enzyme that breaks down lactose
What 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! Glucose is absent and lactose is present Glucose is present and lactose is present Glucose is present and lactose is absent
What is a specific region in the trp operon that you could mutate so it expresses the trp operon in conditions of excess tryptophan. Why will this mutation cause this? Operon structure: promoter, operater, structural genes promoter - DNA region that is the site of RNA polymerase sigma binding and transcription initiation operator – DNA region that influences gene expression through its interaction with a protein (transcription factor) structural genes – gene whose expression is being regulated; encodes a polypeptide or functional RNA
Which of the following statements about the trp operon is false? If a mutation in region 2 prevents the formation of the 2 + 3 loop in the 5’UTR transcription levels will increase. The trp operon is an example of negative repressible operon. Formation of the anti-terminator in the 5’UTR of the trp operon occurs when trp levels are low. In the presence of high trp-tRNA, the genes of the trp operon are not expressed. The role of trp is to bind to the repressor protein and activate it.
Which of the following lac operon genotypes would allow for functional versions of all the structural enzymes of the lac operon to be expressed constitutively even in the absence of lactose? Group of answer choices I+ O+ Z+ Y+ A+ I- O+ Z- Y- A- I+ OC Z+ Y+ A+ IS O+ Z+ Y+ A+ I+ O+ Z- Y+ A+
The figure above shows the structure of lac operon. Which of the following BEST describes what happens in the presence of lactose? Select one: Repressor-lactose complex forms, both the complex and RNA polymerase bind to R. Transcription of S is initiated. Repressor-lactose complex forms and the complex will not bind to R. Transcription of S is initiated. Both repressor and RNA polymerase bind to R. Transcription of S is initiated. Repressor-lactose complex forms and the complex binds to R. Transcription of S is prevented.
Describe the main functional differences between the TRP and the Lac operons. Main functional differences DO NOT refer to the fact that one operon involves TRP and the other involves Lac. They also don’t include that there are different genes found in the TRP operon compared to the Lac operon or that the repressor in the Lac operon is called Lac l. Also DO NOT simply list how both operons work to answer this question.
The tryptophan (trp) operon is a repressible system. This means the genes are normally expressed, but the presence of trp can repress the operon the genes are normally repressed the genes are normally expressed when trp is present the genes are normally repressed, but the presence of trp can activate the genes
For the next two questions, consider the fec operon of Staphylococcus madeupiddis, which encodes an iron citrate uptake system. The fec operon promoter, called "Pfec", is normally off when no regulators are bound to it (like the lac operon promoter). The activator FecA senses iron citrate and brings the appropriate enzyme to Pfec to start fec transcription when iron citrate levels are high. The repressor FecB senses free iron atoms and prevents fec transcription when free iron levels are high by binding to an operator between the promoter and structural genes. MacBook Air DII F9 888 000 F8 80 F7 F6 F5 F4 F3 & 2$ 6. 7 8. 4
You can determine the regulation of an unknown operon based on descriptions like those in the table below. For each row, choose whether the fact would suggest positive or negative or inducible or repressible regulation and indicate your answer with an X in the column. Only one X should appear in each row. In the presence of the signal, the structural genes are expressed. In the presence of the signal, the structural genes are not expressed. In the absence of the signal, the structural genes are expressed. In the absence of the signal, the structural genes are not expressed. The binding of the regulatory protein to the operon results in structural gene expression. The binding of the regulatory protein to the operon prevents structural gene expression. A mutation in the regulatory protein results in constitutive expression of the structural genes. A mutation in the regulatory protein results in no or low expression of the structural genes. Positive? Negative? Inducible? Repressible?