Textbook Question
The drugs ddC and AZT are used to treat AIDS.
Based on their chemical structures, what is their mode of action?
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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 2
Which of the following is a true statement concerning prokaryotic chromosomes?
a. They typically have two or three origins of replication
b. They contain single-stranded DNA
c. They are located in the cytosol
d. They are associated in linear pairs
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Step 1: Understand the nature of prokaryotic chromosomes. Prokaryotes, such as bacteria, generally have a single circular chromosome rather than multiple linear chromosomes like eukaryotes.
Step 2: Consider the number of origins of replication in prokaryotic chromosomes. Typically, prokaryotic chromosomes have a single origin of replication, unlike eukaryotic chromosomes which have multiple origins.
Step 3: Evaluate the DNA structure in prokaryotic chromosomes. Prokaryotic DNA is double-stranded, not single-stranded, which is important for stability and replication.
Step 4: Identify the cellular location of prokaryotic chromosomes. Prokaryotic chromosomes are located in the nucleoid region within the cytoplasm (cytosol), but not enclosed by a nuclear membrane.
Step 5: Analyze the organization of chromosomes. Prokaryotic chromosomes are not paired linearly; they exist as a single circular molecule, so they are not associated in linear pairs.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Structure and Form of Prokaryotic Chromosomes
Prokaryotic chromosomes are typically circular DNA molecules, unlike the linear chromosomes found in eukaryotes. This circular structure allows efficient replication and organization within the cell.
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Prokaryotic Flagellar Structure
Location of Prokaryotic Chromosomes
Prokaryotic chromosomes are located in the nucleoid region of the cell, which is an irregularly shaped area within the cytoplasm, not enclosed by a membrane. This differs from eukaryotic cells where chromosomes are inside a nucleus.
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03:17Location of Transcription & Translation
DNA Replication Origins in Prokaryotes
Prokaryotic chromosomes usually have a single origin of replication where DNA synthesis begins. This contrasts with eukaryotic chromosomes, which have multiple origins to facilitate replication of their larger genomes.
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Related Practice
Textbook Question
This bacteriophage DNA molecule has been warmed. Label the portions that likely have a higher ratio of GC base pairs and the portions that have a higher ratio of AT base pairs.
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Textbook Question
A triplet of mRNA nucleotides that specifies a particular amino acid is called a ____________ .
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Textbook Question
List several ways in which eukaryotic messenger RNA differs from prokaryotic mRNA.
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Textbook Question
Compare and contrast introns and exons.
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Textbook Question
Three effects of point mutations are ___________ , ___________ , and ____________ .
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