Domanda del libro di testo
Which of the following molecules functions as a “proofreader” for a newly replicated strand of DNA?
a. DNA polymerase III
b. Primase
c. Helicase
d. Ligase
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Ch. 7 - Microbial Genetics
Bauman6th EditionMicrobiology with Diseases by TaxonomyISBN: 9780134832302
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TOC.tableOfContents
- Ch. 1 - A Brief History of Microbiology31
- Ch. 2 - The Chemistry of Microbiology28
- Ch. 3 - Cell Structure and Function39
- Ch. 4 - Microscopy, Staining, and Classification25
- Ch. 5 - Microbial Metabolism51
- Ch. 6 - Microbial Nutrition and Growth37
- Ch. 7 - Microbial Genetics51
- Ch. 8 - Recombinant DNA Technology21
- Ch. 9 - Controlling Microbial Growth in the Environment36
- Ch. 10 - Controlling Microbial Growth in the Body: Antimicrobial Drugs21
- Ch. 11 - Characterizing and Classifying Prokaryotes29
- Ch. 12 - Characterizing and Classifying Eukaryotes34
- Ch. 13 - Characterizing and Classifying Viruses, Viroids, and Prions23
- Ch. 14 - Infection, Infectious Diseases, and Epidemiology35
- Ch. 15 - Innate Immunity34
- Ch. 16 - Adaptive Immunity21
- Ch. 17 - Immunization and Immune Testing29
- Ch. 18 - Immune Disorders22
- Ch. 19 - Pathogenic Gram-Positive Bacteria25
- Ch. 20 - Pathogenic Gram-Negative Cocci and Bacilli28
- Ch. 21 - Rickettsias, Chlamydias, Spirochetes, and Vibrios25
- Ch. 22 - Pathogenic Fungi47
- Ch. 23 - Parasitic Protozoa, Helminths, and Arthropod Vectors44
- Ch. 24 - Pathogenic DNA Viruses23
- Ch. 25 - Pathogenic RNA Viruses30
- Ch. 26 - Applied and Industrial Microbiology29
- Ch. 27 - Microbial Ecology and Microbiomes22
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Capitolo 7, Problema 6
In general, __________ operons are inactive until the substrate of their genes’ polypeptides is present.
Guida verificata passo dopo passo1
Understand the concept of operons in microbiology: Operons are clusters of genes under the control of a single promoter and regulatory elements, allowing coordinated expression of genes involved in a common pathway.
Recall that operons can be classified based on their regulation mechanism, such as inducible or repressible operons.
Identify that inducible operons are typically inactive (turned off) until a specific substrate or inducer molecule is present in the environment.
Recognize that the presence of the substrate acts as an inducer, binding to the repressor protein and causing it to release from the operator region, thereby allowing transcription of the operon's genes.
Conclude that the blank in the sentence should be filled with 'inducible' because inducible operons are inactive until the substrate of their gene products is present.
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Inducible Operons
Inducible operons are gene clusters that remain inactive until a specific substrate or inducer molecule is present. When the substrate binds to the repressor protein, it causes a conformational change that releases the repressor from the operator, allowing transcription to proceed.
Video consigliato:
04:25
Inducible Operons
Repressor Proteins and Operator Sites
Repressor proteins bind to operator sites on DNA to block RNA polymerase and prevent transcription. In inducible operons, the repressor is active by default and only detaches when the inducer (substrate) is present, enabling gene expression.
Video consigliato:
02:50Proteins
Substrate as an Inducer
The substrate of the enzymes encoded by the operon acts as an inducer by interacting with the repressor protein. This interaction inactivates the repressor, triggering the operon to become active and produce enzymes needed to metabolize the substrate.
Video consigliato:
03:19Methods of Inducing Mutations
Pratica correlata
Domanda del libro di testo
Besides the fact that it synthesizes RNA, how does RNA polymerase differ in function from DNA polymerase?
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Domanda del libro di testo
A daughter DNA molecule is composed of one original strand and one new strand because DNA replication is __________ .
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Domanda del libro di testo
An operon consists of __________ , ___________ , and __________ , and is associated with a regulatory gene.
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Domanda del libro di testo
Compare and contrast the structure and components of DNA and RNA in prokaryotes.
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Domanda del libro di testo
Describe the operon model of gene regulation.
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