Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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Related questions

Q: What are the 5 gene in order on the E. coli tryptophan operon?
A: The trp operon, found in the bacterium Escheichia coli is a group of genes that encode biosynthetic…
Q: What role does the I gene product play in regulation of the Lac operon
A: The operon plays an important role in bacteria. The lac operon is an essential operon useful for…
Q: What are strong promoters?
A: The strength of a promoter is the rate of transcription of the gene controlled by this promoter.
Q: Why is a trimming process important in converting precursors of tRNA and rRNA to the active forms?
A: Ribonucleic acid is fundamental in different biological roles in coding, translating, regulation,…
Q: Is proA in the lac operon? Only lacI, lacZ, lacY, are in the lac operon, right?
A: Answer : No,  proA is absent in lac operon.        Additional information : ProA is present in the…
Q: What is the functional role of the TATA box?
A: DNA ( Deoxyribonucleic acid) is a long chain made up of nucleotides. It carries genetic information.…
Q: How does repression work in the lac operon?
A: Lac operon consists of a promoter, operator group of structural genes such as lac A, lac Z, and lac…
Q: What turns the operon on when lactose is present?
A: An operon is defined as a functioning unit of DNA that contains a cluster or group of genes under…
Q: What do you mean by coordinate expression of genes in operon?
A: Answer- In prokaryotes genes are controlled by one promoter region that is called polycistronic…
Q: What is the function of the promoter
A: Promoter is the site on DNA where proteins such as RNA polymerase and some transcrption factors…
Q: What is the receptor for the targeting sequence?
A: Proteins synthesized by ribosomes include soluble and membrane proteins of the Endoplasmic Reticulum…
Q: What is a functional consequence of RNA editing?
A: RNA editing is otherwise known as RNA modification for obvious reasons. The process deals with the…
Q: the kpc gene do
A: Types of bacteria Bacteria are classified into two major types, Gram-positive bacteria…
Q: Prokaryotes use operons to regulate their transcripts. What does it mean for them to be…
A: Prokaryotes are a simpler form of life. It lacks sophisticated machinery and membrane-bound…
Q: How is glucose involved in positive control of the lac operon?
A: A set of genes present in E.coli. that regulates the uptake of lactose from the surrounding…
Q: What is the function of each of the parts of the lac operon (promoter, operator, CAP binding site,…
A: The lactose operon (also called the lac operon) is a group of genes present in E. coli and other…
Q: What are operons ?
A: Gene expression can be defined as a mechanism by which the information or instructions present in…
Q: What are the operon fusion and the gene fusion? How can they be used for studying gene expression in…
A: Fusion gene is a hybrid gene formed from two previously independent genes or ORFs (Open Reading…
Q: How many types of promoters are there?
A: Promoters are DNA sequences that determine where the gene transcription by RNA polymerase begins.…
Q: What is the function of cAMP in the regulation of the lac operon and how is the production of cAMP…
A: The Lac operon is a set of genes in prokaryotic cells that regulate lactose metabolism. An operator…
Q: What led researchers to conclude that a repressor moleculeregulates the lac operon?
A: Lac operon is regulated by the lac repressor molecule.
Q: What are the example of operon?
A: Operon is a group of genes which controls the synthesis process of protein molecules depending on…
Q: What is a negative inducible operon?
A: Regulated genes can be switched on/off depending on cell's metabolic needs. Operon It is a group of…
Q: 15a) Most amino acid biosynthetic operons in prokaryotes have a structure similar to that observed…
A: The tryptophan operon consists of five structural genes: trpE, trpD, trpC, trpB, trpA that codes for…
Q: What's transgenesis?
A: Transgenesis can be described as a process of introducing a gene (referred to as a transgene) from…
Q: How does the level of tryptophan alter transcription of the trp operon?
A: An operon is defined as the set of structural genes that are under the regulation of a common…
Q: What is a bacterial operon and the two types of it?
A: The bacterial genome consists of thousands of different genes located on one chromosome and these…
Q: How does cAMP and allolactose work to influence the operon?
A: The two proteins involved regulation of lac operon are CRP (catabolite repressor protein) and lac…
Q: What is not a part of an operon?
A: Operon comprises all the genes that are involved in metabolic regulation. It is the unit of the gene…
Q: How is the operon positively and negatively regulated?
A: The activity of the promoter that controls the expression of the lac operon is regulated by two…
Q: How can we identify histone modifications?
A: Histones are the class of proteins which are associated with the DNA in the nucleus and aids in the…
Q: Why does the lac operon include more than one operator sequence?
A: Lactose operon (lac operon) is an operon required for the transport and metabolism of lactose in…
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Concept explainers

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 anoth…
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.
Topic Video
Question
**What is the lac operon?** The lac operon is a set of genes in bacteria, particularly E. coli, that are involved in the metabolism of lactose. It is an example of an inducible operon that is activated in the presence of lactose and the absence of glucose. The operon includes three structural genes: lacZ, lacY, and lacA. These genes code for proteins needed to transport and break down lactose into glucose and galactose. **Regulatory Mechanisms:** - **Promoter:** The site where RNA polymerase binds to start transcription. - **Operator:** A segment where a repressor binds, blocking RNA polymerase and preventing transcription. - **Repressor:** A protein that inhibits the expression of the operon in the absence of lactose. - **Inducer (allolactose):** A molecule that inactivates the repressor, allowing the operon to be transcribed when lactose is present. The lac operon is a classical model of gene regulation, illustrating how cells can efficiently respond to environmental changes.
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Transcribed Image Text:**What is the lac operon?** The lac operon is a set of genes in bacteria, particularly E. coli, that are involved in the metabolism of lactose. It is an example of an inducible operon that is activated in the presence of lactose and the absence of glucose. The operon includes three structural genes: lacZ, lacY, and lacA. These genes code for proteins needed to transport and break down lactose into glucose and galactose. **Regulatory Mechanisms:** - **Promoter:** The site where RNA polymerase binds to start transcription. - **Operator:** A segment where a repressor binds, blocking RNA polymerase and preventing transcription. - **Repressor:** A protein that inhibits the expression of the operon in the absence of lactose. - **Inducer (allolactose):** A molecule that inactivates the repressor, allowing the operon to be transcribed when lactose is present. The lac operon is a classical model of gene regulation, illustrating how cells can efficiently respond to environmental changes.
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