Figure 16.5 In E. coli, the tip operon is on by default, while the lac operon is off. Why do you think that this is the case? In the absence of lactose, the lac repressor binds the operator, and transcription is blocked.

Q: How are the following components in the trp operon system affected by a mutation in trpC?  (trp…

A: Regulatory proteins are proteins that provide regulatory activities in processes like transcription.…

Q: If an abnormal repressor protein could still bind allolactose but the binding of allolactose did not…

A: Operon acts as a single regulated unit having one or more structural genes, promoter gene, a…

Q: In the lac operon (above), what happens when glucose levels are low, but lactose levels increase?…

A: Operon is the gene regulatory mechanism present in prokaryotic organisms. It regulates the…

Q: Given the following mutant and conditions, predict the expression of the lacZ gene (no expression,…

A: Lactose operon is an example of inducible operon in which the expression of downstream genes will…

Q: Operons are a common feature of bacterial genomes. Which of the following statements about the lac…

A: Lac operon has three important genes that helps the bacteria to take up the lactose sugar when…

Q: The only way that information is extracted out of DNA is through the transcription of MRNAS that…

A: According to our guideline we can answer only the first question. So upload the second question…

Q: the folid ing mutations would result in the highest level of lac operon transcription in the absence…

A: Lac operon is an operon required for the transport and metabolism of lactose in E. coli and many…

Q: a mutation that leads to a nonfunctional adenylate cyclase enzyme would lead to what expression…

A: A mutation is a change in the genetic material (the genome) of a cell of a live creature or a virus…

Q: Predict the effect on the activity of the lac operon of a mutation that disrupts the function of: a)…

A: The Catabolic Activator Protein (CAP) is a protein which acts as a positive regulating factor for…

Q: The highest level of transcription of the E. coli lac operon occurs when CAP (+cAMP) is bound to the…

A: The lac operon in E. coli is a system of genes that regulates the metabolism of lactose, a sugar.…

Q: Describe the structure of the Lac operon. How is it turned on? How is it turned off?

A: The gene products of the lac operon are very important for lactose metabolism. This is crucial for…

Q: Strain X-23 has a mutation in the lacI gene resulting in a lacI protein that cannot bind DNA.…

A: The operon model is applicable in bacterial gene regulation and some lower eukaryotes gene…

Q: Which of the following conditions is most likely to result in an increase rate of transcription of…

A: Lactose in bacteria is called beta-galactoside which is used as energy and as a carbon source.…

Q: Regulation of the E. coli trp operon by attenuation requires the trp repressor protein. prevents…

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

Q: Compare and contrast the functional mechanism of the Inducible - Lac operon  with the Repressible -…

A: Gene expression is a process in which the genetic instructions of genes are utilized to manage…

Q: A bacterial cell is mutated and cannot create the repressor protein associated with the Lac operon.…

A: Lac operon is associated with uptake and metabolism of lactose. It has several components such as a…

Q: When lactose is first introduced into the medium, the lac operon is not induced and thus permease…

A: The lac operon in E.coli consists of 3 genes (lac Z, lac Y, lac A). The lac Z encodes beta…

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: Which of the following mutations would result in the highest level of lac operon transcription in…

A:

Q: Which of the below conditions would result in the lowest level of expression from the lac operon…

A: Option C is correct :

Q: You are studying the ABCD operon from a newly isolated bacterium. Which of the following would…

A: A Operon consists of segments of DNA , which carry codes for the synthesis of proteins. These genes…

Q: If the levels of both Glucose and Lactose were low in a bacterial cell, describe the state of the…

A: In bacteria and their viruses, an operon is a genetic regulatory structure in which genes coding for…

Q: You have an E.coli strain in which the lac operon is not expressed when glucose is absent and…

A: Introduction :- E. coli is a bacteria that lives in healthy people and animals' intestines. The…

Q: that

A: The trp operon found in E coli bacteria . It's a group of genes that encode biosynthetic enzymes.…

Q: Which of the following arabinose operon regulatory sites is exclusively involved in the repression…

A: Answer - Option B - ara O2

Q: v constructed gene. What will

A: introduction pGLO is a genetically engineered plasmid which incorporates parts of the arabinose…

Q: ac operon.  Drag the listed molecules to their corresponding bin. Reset Help   ONPG IPTG X-Gal…

A: ONPG - beta-galactosidase cleaves this molecule to form a visible yellow product. Explaination:  The…

Q: Suppose that E. coli sustains a mutation in its gene for the lac operon depressor making the…

A: A lac operon is a group of genes with a single promoter ( it is transcribed as a single mRNA). 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.