Part II. Gene Regulation with Operons 4. When bacteria find themselves in an environment rich in the sugar lactose, they will digest the lactose using specific enzymes. However, most of the time bacteria are not in a lactose rich environment, so they don't need to make those enzymes most of the time (that would be expensive and wasteful). The enzymes needed to digest lactose are coded by the lac operon. a. Would you expect the lac operon to be inducible or repressible? Explain your reasoning. b. What role does lactose play in regulating the lac operon? What does it do, exactly, to promote gene expression in this case? c. Briefly explain what needs to happen for the lac operon to return to its original "off" state (not being transcribed).

Q: 10. a. Describe an operon? b. How lac operons controls gene expression in bacteria

A: (a) An operon is a functional unit of DNA containing a set of genes including structural gene, a…

Q: Model 1: What conditions would need to be present in the cell in order to reverse the regulatory…

A: The operon is the system that explains the regulation of gene expression in terms of switching “on”…

Q: Assuming that the level of glucose is low, a mutation in the repressor associated with the lac…

A: The lac operon stands for lactose operon. These are a set of genes that are found in E.coli and…

Q: The lac operon consists of three structural genes, lacZ, lacY and lacA that are transcribed as a…

A: ii) LacP is called the promoter gene of lac operon.

Q: What happens with a 50/50 split bewteen glucose and lactose in the lac operon? in the lac operon the…

A: The lac operon is a set of genes that are used in the metabolism of lactose in E. coli. The genes in…

Q: Why is step 2 correct, is it because this is a repressible operon?

A: Operon is a cluster of genes which contains operator, promoter and structural genes. It is a kind of…

Q: A researcher was trying to determine whether two molecules (molecule A and molecule B) were co-…

A: CoRepressor - The function of the corepressor is to induce transcriptional silencing or to repress…

Q: the trp operon is an example of… ? enzyme repression enzyme induction  catabolite repression

A: A primary difference between repressible and inducible systems is the result that occurs when the…

Q: 5g. A mutation has occurred rendering the regulatory protein unable to recognize the operator…

A: Operons are groups of genes involved in regulating a process and are transcribed as a single mRNA.…

Q: Can you explain what exactly operon is? Instead of just copying and pasting from google, can you…

A: DNA  DNA are the inheritable unite which passes from parents to their offsprings. DNA contains genes…

Q: 26) If there is no lactose present in the cell of a bacterium with a "lac operon" the repressor…

A: Operon system is an example of prokaryotic gene regulation in which the expression of polycystonic…

Q: Utilizing lactose operon, how can we explain how induction controls enzyme synthesis 2. Use…

A: An operon is a group of genes that code for proteins that are involved in a single cellular…

Q: only in cell biology the Lac operon in bacteria encodes proteins required to import and digest the…

A: The lac operon, also known as the lactose operon, is found in E. coli and other intestinal bacteria.…

Q: Lacl' mutant-Lactose is present I P lacl lacP laco lacz lacy lacA LEVEL 16-21 1 OF 4 Look at the lac…

A: The lac operon, is a group of genes that are involved in the metabolism of lactose in bacteria. The…

Q: How does induction control enzyme synthesis using lactose operon?  2. Describe how level of a key…

A: By controlling the transcription of the mRNA which is needed for the enzyme synthesis, the genetic…

Q: Explain the positive control of the lac operon A toxin was found to inhibit the production of CAMP…

A: Lac operon is the segment of DNA which includes cluster of genes for breaking down of lactose. The…

Q: 13. Choose/mark the correct word to complete the statement. Consider the regulation of CAMP and the…

A: Operon is the segment of DNA which contains regulatory gene, promoter gene, operator gene and…

Q: . Define operon and describe how operons affect how bacteria can regulate their gene expression.

A: In prokaryotes, one promoter is able to regulate multiple genes.

Q: Fill in the 2 blanks: The lac operon is an example of (blank 1)_______ control in which the presence…

A: An operon is a cluster of genes which is controlled by a single promoter. Lac operon, also known as…

Q: 5. There are four genes in the FAK operon. a. How many mRNAs are encoded by this operon? b. The FAK…

A: Question 5 Answer a) There is only one mRNA that codes for four genes in the FAK operon.…

Q: 1. The B-galactosidase gene of the lac operon is expressed at high level when which combination of…

A: High lactose concentration induces the production of the B-galactosidase enzyme. Lactose acts as an…

Q: If the lac operon is "on" and transcribed, what is produced by RNA polymerase? O a. RNA polymerase…

A: The lac operon is a group of genes that work together to regulate the metabolism of lactose in…

Q: 3. Draw an anabolic operon with three biosynthetic genes for compound Q and a catabolic operon with…

A:

Q: I. CAP-CAMP complex binds to the operator locus blocking the RNA polymerase. II. In the presence of…

A: The lactose operon (also known as the lac operon) is a set of genes that are specific for uptake and…

Q: 1d regulation of the lack operon by the lack repressor is an example of negative regulation. what in…

A: E.coli  bacterium intake glucose as a primary source of energy metabolism . When a glucose is scarce…

Q: None

A: The provided diagram represents an mRNA molecule transcribed from an operon, a typical feature in…

Q: 5) The bacterial Lac operon is an example of transcriptional regulation. What are the major…

A: Using an example of Escherichia coli for the bacterial lac operon. Escherichia coli is a…

Q: Choose the best options, by dragging and dropping the colour coded text boxes below, that fill in…

A: Operon is transcription unit of prokaryotic genome with consist of many contiguous structural genes…

Q: Lac operon regulation under allolactose functions under____________ control; trp operon regulation…

A: Operon is the segment of DNA which includes regulatory gene, promoter gene, operator gene and…

Q: What statement is NOT true regarding transcription attenuation of amino acid biosynthetic operons?…

A: Amino acid biosynthesis is an anabolic process in which a molecule is synthesized as an end product.…

Q: 1. Predict the effect of each situation on the Lac or Trp operon. Lac operon is ON Lac operon is OFF…

A: Operon is the group of genes that are expressed under the same regulatory sequences.

Q: A low level of expression of lac operon occurs at all the time.can you explain the logic behid this…

A: The operon is the group of genes controlled by shared protein. Operons have multiple genes with…

Q: You mutated the gene encoding the cyclic AMP receptor protein (CRP). In this mutant, the CRP is…

A: Operon is a gene regulatory structure that contains clusters of genes and these clusters of genes…

Q: O B.2 O C.3 The figure below depicts the lac operon. OD. 4 Galac _ If all of the genes depicted are…

A: These are present within a specific region in the DNA(deoxyribonucleic acid) and are controlled by…

Q: A scientist has discovered a strain of bacteria that can convert ethanol to pyruvate when stimulated…

A: Solution 1) The repressor of this operon is functional It is active when ethanol is absent and…

Q: What is one advantage or Transcription and translation can occur simultaneously It provides an…

A: Exons are coding sections of an RNA transcript, or the DNA encoding it, that are translated into…

Q: According to the operon hypothesis, the Z and Y genes of E. coli are classified as structural genes,…

A: The Lac Operon is responsible for Lactose metabolism and transport in E.coli. This operon consists…

Q: For each of the following mutations in the lac operon, type a C if expression of lacz would be…

A: The lac operon is a group of genes in bacteria that regulate lactose breakdown and utilization. It…

Q: Match the term with its description. cAMP     Allows lactose to enter the cell and product of the…

A: Cyclic Adenosine monophosphate is a second messenger which is necessary for various biological…

Q: Assume you have identified a new operon in bacteria (which you call the suc operon) tha encodes…

A: Any bacterial gene can be classified as an operon.An operon is a collection of bacterial genes with…

Q: Like the lac operon, the hexose operon is controlled by a separate regulatory protein under the…

A: Hexose operon is the segment of DNA which includes regulatory gene, structural gene, promoter and…

Q: 32. Operons are the basic units by which transcriptional regulation occurs in prokaryotes. Using…

A: Genes coding for functionally related proteins are concentrated throughout the DNA of bacteria and…

Q: Explain the steps in Trp Operon. Take note, important enzymes and chemicals are needed in your…

A: The trp operon is a group of genes that codes for the molecules that are responsible for the…

Gene Interactions

When the expression of a single trait is influenced by two or more different non-allelic genes, it is termed as genetic interaction. According to Mendel's law of inheritance, each gene functions in its own way and does not depend on the function of another gene, i.e., a single gene controls each of seven characteristics considered, but the complex contribution of many different genes determine many traits of an organism.

Gene Expression

Gene expression is a process by which the instructions present in deoxyribonucleic acid (DNA) are converted into useful molecules such as proteins, and functional messenger ribonucleic (mRNA) molecules in the case of non-protein-coding genes.