Domanda del libro di testo
A regulon is a set of genes controlled by
a. One type of regulator of transcription
b. Two or more different alternative sigma proteins
c. Many different types of promoters
d. Glucose
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Ch. 18 - Control of Gene Expression in Bacteria
Freeman8th EditionBiological ScienceISBN: 9780138276263
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TOC.tableOfContents
- Ch. 1 - Biology: The Study of Life13
- Ch. 2 - Water and Carbon: The Chemical Basis of Life14
- Ch.3 - Protein Structure and Function10
- Ch.4 - Nucleic Acids and the RNA World10
- Ch. 5 - An Introduction to Carbohydrates10
- Ch. 6 - Lipids, Membranes, and the First Cells11
- Ch. 7 - Inside the Cell10
- Ch. 8 - Energy and Enzymes: An Introduction to Metabolism10
- Ch. 9 - Cellular Respiration and Fermentation11
- Ch. 10 - Photosynthesis12
- Ch. 11 - Cell-Cell Interactions12
- Ch. 12 - The Cell Cycle8
- Ch. 13 - Meiosis12
- Ch. 14 - Mendel and the Gene23
- Ch. 15 - DNA and the Gene: Synthesis and Repair15
- Ch. 16 - How Genes Work16
- Ch. 17 - Transcription, RNA Processing, and Translation16
- Ch. 18 - Control of Gene Expression in Bacteria16
- Ch. 19 - Control of Gene Expression in Eukaryotes12
- Ch. 20 - The Molecular Revolution: Biotechnology, Genomics, and New Frontiers15
- Ch. 21 - Genes, Development, and Evolution12
- Ch. 22 - Evolution by Natural Selection16
- Ch. 23 - Evolutionary Processes13
- Ch. 24 - Speciation15
- Ch. 25 - Phylogenies and the History of Life13
- Ch. 26 - Bacteria and Archaea15
- Ch. 27 - Diversification of Eukaryotes16
- Ch. 28 - Green Algae and Land Plants16
- Ch. 29 - Fungi18
- Ch. 30 - An Introduction to Animals9
- Ch. 31 - Protostome Animals15
- Ch. 32 - Deuterostome Animals17
- Ch. 33 - Viruses16
- Ch. 34 - Plant Form and Function16
- Ch. 35 - Water and Sugar Transport in Plants16
- Ch. 36 - Plant Nutrition13
- Ch. 37 - Plant Sensory Systems, Signals, and Responses16
- Ch. 38 - Flowering Plant Reproduction and Development16
- Ch. 39 - Animal Form and Function17
- Ch. 40 - Water and Electrolyte Balance in Animals16
- Ch. 41 - Animal Nutrition16
- Ch. 42 - Gas Exchange and Circulation16
- Ch. 43 - Animal Nervous Systems16
- Ch. 44 - Animal Sensory Systems16
- Ch. 45 - Animal Movement11
- Ch. 46 - Chemical Signals in Animals16
- Ch. 47 - Animal Reproduction and Development16
- Ch. 48 - The Immune System in Animals16
- Ch. 49 - An Introduction to Ecology15
- Ch. 50 - Behavioral Ecology16
- Ch. 51 - Population Ecology16
- Ch. 52 - Community Ecology20
- Ch. 53 - Ecosystems and Global Ecology17
- Ch. 54 - Biodiversity and Conservation Ecology18
Freeman8th EditionBiological ScienceISBN: 9780138276263Non è quello che usi tu?Cambia libro di testo
Capitolo 18, Problema 1
Why are the genes involved in lactose metabolism considered to be an operon?
a. They occupy adjacent locations on the E. coli chromosome.
b. They have a similar function.
c. They are all required for normal cell function.
d. They are all controlled by the same promoter.
Guida verificata passo dopo passo1
Understand the concept of an operon: An operon is a cluster of genes that are transcribed together and controlled by a single promoter. This allows for coordinated regulation of genes that are involved in a common pathway or function.
Identify the genes involved in lactose metabolism: In E. coli, the genes involved in lactose metabolism include lacZ, lacY, and lacA. These genes encode enzymes necessary for the uptake and breakdown of lactose.
Examine the control mechanism: In the lac operon, these genes are transcribed as a single mRNA molecule from a common promoter, the lac promoter. This means they are regulated together, allowing the cell to efficiently respond to the presence or absence of lactose.
Consider the options given: Option (d) states that the genes are all controlled by the same promoter, which aligns with the definition of an operon where multiple genes are regulated together by a single promoter.
Conclude based on the definition and options: The defining feature of an operon is the shared promoter controlling multiple genes, making option (d) the correct reason why the genes involved in lactose metabolism are considered an operon.
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Operon
An operon is a cluster of genes under the control of a single promoter, allowing them to be transcribed together into a single mRNA strand. This arrangement is common in prokaryotes, such as E. coli, and enables coordinated regulation of genes that are functionally related, such as those involved in lactose metabolism.
Video consigliato:
06:24
Review of the Lac Operon & Trp Operon
Promoter
A promoter is a DNA sequence that initiates transcription of a particular gene or group of genes. In the context of an operon, a single promoter controls the transcription of multiple genes, ensuring they are expressed simultaneously. This is crucial for the efficient regulation of metabolic pathways, like lactose metabolism in bacteria.
Video consigliato:
04:23Structure of an Operon
Lactose Metabolism in E. coli
Lactose metabolism in E. coli involves the breakdown of lactose into glucose and galactose, which the bacterium can use for energy. The genes responsible for this process are organized into the lac operon, which includes genes for lactose transport and breakdown, all regulated by a single promoter to ensure efficient response to the presence of lactose.
Video consigliato:
04:12Mechanism of F Plasmid Conjugation in E. coli
Pratica correlata
Domanda del libro di testo
In the lac operon, the repressor inhibits transcription when
a. The repressor is bound to the inducer.
b. The repressor is not bound to the inducer.
c. The repressor is bound to glucose.
d. The repressor is not bound to the operator.
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Domanda del libro di testo
Activators bind to regulatory sequences in ________ and to ________ polymerase.
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