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 7
A daughter DNA molecule is composed of one original strand and one new strand because DNA replication is __________ .
Verified step by step guidance1
Understand the nature of DNA replication: DNA replication is the process by which a cell duplicates its DNA before cell division.
Recall the three models of DNA replication: conservative, semiconservative, and dispersive.
Identify that in the semiconservative model, each daughter DNA molecule consists of one original (parental) strand and one newly synthesized strand.
Recognize that this model was confirmed by the Meselson-Stahl experiment, which demonstrated the semiconservative nature of DNA replication.
Conclude that the blank in the sentence should be filled with 'semiconservative' to accurately describe the composition of daughter DNA molecules.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Semiconservative DNA Replication
DNA replication is semiconservative, meaning each new DNA molecule consists of one original (parental) strand and one newly synthesized strand. This mechanism ensures genetic continuity by preserving half of the original DNA in each daughter molecule.
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Guided course
03:37
Introduction to DNA Replication
DNA Strand Complementarity
During replication, each original DNA strand serves as a template for the formation of a complementary new strand. Base pairing rules (A with T, and G with C) guide the addition of nucleotides, ensuring accurate copying of genetic information.
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05:15Leading & Lagging DNA Strands
Role of DNA Polymerase
DNA polymerase is the enzyme responsible for synthesizing the new DNA strand by adding nucleotides complementary to the template strand. It also proofreads the new strand to minimize errors during replication.
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04:01DNA Polymerases
Related Practice
Textbook Question
The addition of a ----CH3 to a cytosine nucleotide after DNA replication is called: .
a. Methylation
b. Restriction
c. Transcription
d. Transversion
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Textbook Question
Besides the fact that it synthesizes RNA, how does RNA polymerase differ in function from DNA polymerase?
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Textbook Question
Describe the formation and function of mRNA, rRNA, and tRNA in prokaryotes and eukaryotes.
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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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