Textbook Question
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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Table of contents
- 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
Bauman6th EditionMicrobiology with Diseases by TaxonomyISBN: 9780134832302Not the one you use?Change textbook
Chapter 7, Problem 5
An operon consists of __________ , ___________ , and __________ , and is associated with a regulatory gene.
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Understand that an operon is a functioning unit of genomic DNA containing a cluster of genes under the control of a single promoter, allowing coordinated expression.
Identify the three main components of an operon: the promoter, the operator, and the structural genes.
The promoter is the DNA sequence where RNA polymerase binds to initiate transcription.
The operator is a regulatory sequence where a repressor protein can bind to block transcription.
The structural genes are the genes that code for proteins or enzymes needed for a specific metabolic pathway or function.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Structural Genes
Structural genes are the segments of DNA within an operon that code for proteins or enzymes. These genes are transcribed together into a single mRNA molecule, allowing coordinated expression of proteins involved in a common pathway or function.
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Promoter
The promoter is a DNA sequence located upstream of the structural genes where RNA polymerase binds to initiate transcription. It plays a crucial role in regulating gene expression by controlling the start of mRNA synthesis.
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Operator
The operator is a regulatory DNA segment situated between the promoter and structural genes. It acts as a binding site for repressor proteins, which can block RNA polymerase access and thus control the transcription of the operon.
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Related Practice
Textbook Question
Nucleotides used in the replication of DNA __________ .
a. Carry energy
b. Are found in four forms, each with a deoxyribose sugar, a phosphate, and a base
c. Are present in cells as triphosphate nucleotides
d. All of the above are correct.
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Textbook Question
Polypeptide synthesis requires large amounts of energy. How do cells regulate synthesis to conserve energy? Describe one specific example.
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Textbook Question
In general, __________ operons are inactive until the substrate of their genes’ polypeptides is present.
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Textbook Question
Compare and contrast the structure and components of DNA and RNA in prokaryotes.
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Textbook Question
Describe the operon model of gene regulation.
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