Domanda del libro di testo
Outline the current model for DNA synthesis.
1029
views
Ch. 10 - DNA Replication
Klug10th EditionEssentials of GeneticsISBN: 9780135588789
Non è quello che usi tu?Cambia libro di testoScegli un libro di testo diverso
TOC.tableOfContents
- Ch. 1 - Introduction to Genetics16
- Ch. 2 - Mitosis and Meiosis28
- Ch. 3 - Mendelian Genetics37
- Ch. 4 - Modification of Mendelian Ratios53
- Ch. 5 - Sex Determination and Sex Chromosomes32
- Ch. 6 - Chromosome Mutations: Variation in Number and Arrangement37
- Ch. 7 - Linkage and Chromosome Mapping in Eukaryotes36
- Ch. 8 - Genetic Analysis and Mapping in Bacteria and Bacteriophages24
- Ch. 9 - DNA Structure and Analysis38
- Ch. 10 - DNA Replication29
- Ch. 11 - Chromosome Structure and DNA Sequence Organization22
- Ch. 12 - The Genetic Code and Transcription36
- Ch. 13 - Translation and Proteins27
- Ch. 14 - Gene Mutation, DNA Repair, and Transposition34
- Ch. 15 - Regulation of Gene Expression in Bacteria22
- Ch. 16 - Regulation of Gene Expression in Eukaryotes37
- Ch. 17 - Recombinant DNA Technology27
- Ch. 18 - Genomics, Bioinformatics, and Proteomics30
- Ch. 19 - The Genetics of Cancer21
- Ch. 20 - Quantitative Genetics and Multifactorial Traits37
- Ch. 21 - Population and Evolutionary Genetics45
Klug10th EditionEssentials of GeneticsISBN: 9780135588789Non è quello che usi tu?Cambia libro di testo
Capitolo 10, Problema 20b
Several temperature-sensitive mutant strains of E. coli display the following characteristics. Predict what enzyme or function is being affected by each mutation.
Okazaki fragments accumulate, and DNA synthesis is never completed.
Guida verificata passo dopo passo1
Understand the biological context: Okazaki fragments are short DNA sequences synthesized on the lagging strand during DNA replication. Normally, these fragments are joined together to form a continuous strand.
Identify the process involved: The joining of Okazaki fragments requires the removal of RNA primers and the sealing of gaps between fragments. This involves enzymes such as DNA polymerase I and DNA ligase.
Consider the effect of mutation: If Okazaki fragments accumulate and DNA synthesis is never completed, it suggests a failure in either removing RNA primers or sealing the fragments together.
Focus on the key enzymes: DNA polymerase I removes RNA primers and fills in the gaps with DNA, while DNA ligase seals the nicks between Okazaki fragments to create a continuous strand.
Predict the affected enzyme or function: The mutation likely affects either DNA polymerase I's exonuclease activity (removal of RNA primers) or DNA ligase's ability to join fragments, preventing completion of lagging strand synthesis.
Risposta video verificata per un problema simile:
Questa soluzione video è stata consigliata dai nostri tutor come utile per risolvere questo problema.
Durata del video:
1mConcetti chiave
Ecco i concetti essenziali che devi comprendere per rispondere correttamente alla domanda.
Okazaki Fragments and Lagging Strand Synthesis
Okazaki fragments are short DNA segments synthesized discontinuously on the lagging strand during DNA replication. Their proper joining is essential for continuous DNA synthesis. Accumulation of these fragments indicates a defect in processing or joining steps of lagging strand replication.
Video consigliato:
Percorso guidato
11:59
Steps to DNA Replication
Role of DNA Ligase
DNA ligase is the enzyme responsible for sealing nicks between Okazaki fragments by forming phosphodiester bonds. If DNA ligase is defective or inactive, Okazaki fragments accumulate because they cannot be joined into a continuous strand, halting DNA synthesis completion.
Video consigliato:
Percorso guidato
01:45DNA Proofreading
Temperature-Sensitive Mutations
Temperature-sensitive mutations produce proteins that function normally at permissive temperatures but lose activity at restrictive (higher) temperatures. Studying these mutants helps identify essential enzymes by observing which functions fail when the protein is inactivated.
Video consigliato:
Percorso guidato
10:48Mutations and Phenotypes
Pratica correlata
Domanda del libro di testo
Several temperature-sensitive mutant strains of E. coli display the following characteristics. Predict what enzyme or function is being affected by each mutation.
Newly synthesized DNA contains many mismatched base pairs.
669
views
Domanda del libro di testo
Several temperature-sensitive mutant strains of E. coli display the following characteristics. Predict what enzyme or function is being affected by each mutation.
Synthesis is very slow.
651
views
Domanda del libro di testo
Several temperature-sensitive mutant strains of E. coli display the following characteristics. Predict what enzyme or function is being affected by each mutation.
Supercoiled strands remain after replication, which is never completed.
706
views
Domanda del libro di testo
Why is DNA synthesis expected to be more complex in eukaryotes than in bacteria? How is DNA synthesis similar in the two types of organisms?
912
views
Domanda del libro di testo
Several temperature-sensitive mutant strains of E. coli display the following characteristics. Predict what enzyme or function is being affected by each mutation.
No initiation occurs.
743
views