Domanda del libro di testo
Telomerase synthesizes DNA in the _____ direction.
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Ch. 15 - DNA and the Gene: Synthesis and Repair
Freeman8th EditionBiological ScienceISBN: 9780138276263
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TOC.tableOfContents
- Ch. 1 - Biology: The Study of Life13
- Ch. 2 - Water and Carbon: The Chemical Basis of Life14
- Ch.3 - Protein Structure and Function10
- Ch.4 - Nucleic Acids and the RNA World10
- Ch. 5 - An Introduction to Carbohydrates10
- Ch. 6 - Lipids, Membranes, and the First Cells11
- Ch. 7 - Inside the Cell10
- Ch. 8 - Energy and Enzymes: An Introduction to Metabolism10
- Ch. 9 - Cellular Respiration and Fermentation11
- Ch. 10 - Photosynthesis12
- Ch. 11 - Cell-Cell Interactions12
- Ch. 12 - The Cell Cycle8
- Ch. 13 - Meiosis12
- Ch. 14 - Mendel and the Gene23
- Ch. 15 - DNA and the Gene: Synthesis and Repair15
- Ch. 16 - How Genes Work16
- Ch. 17 - Transcription, RNA Processing, and Translation16
- Ch. 18 - Control of Gene Expression in Bacteria16
- Ch. 19 - Control of Gene Expression in Eukaryotes12
- Ch. 20 - The Molecular Revolution: Biotechnology, Genomics, and New Frontiers15
- Ch. 21 - Genes, Development, and Evolution12
- Ch. 22 - Evolution by Natural Selection16
- Ch. 23 - Evolutionary Processes13
- Ch. 24 - Speciation15
- Ch. 25 - Phylogenies and the History of Life13
- Ch. 26 - Bacteria and Archaea15
- Ch. 27 - Diversification of Eukaryotes16
- Ch. 28 - Green Algae and Land Plants16
- Ch. 29 - Fungi18
- Ch. 30 - An Introduction to Animals9
- Ch. 31 - Protostome Animals15
- Ch. 32 - Deuterostome Animals17
- Ch. 33 - Viruses16
- Ch. 34 - Plant Form and Function16
- Ch. 35 - Water and Sugar Transport in Plants16
- Ch. 36 - Plant Nutrition13
- Ch. 37 - Plant Sensory Systems, Signals, and Responses16
- Ch. 38 - Flowering Plant Reproduction and Development16
- Ch. 39 - Animal Form and Function17
- Ch. 40 - Water and Electrolyte Balance in Animals16
- Ch. 41 - Animal Nutrition16
- Ch. 42 - Gas Exchange and Circulation16
- Ch. 43 - Animal Nervous Systems16
- Ch. 44 - Animal Sensory Systems16
- Ch. 45 - Animal Movement11
- Ch. 46 - Chemical Signals in Animals16
- Ch. 47 - Animal Reproduction and Development16
- Ch. 48 - The Immune System in Animals16
- Ch. 49 - An Introduction to Ecology15
- Ch. 50 - Behavioral Ecology16
- Ch. 51 - Population Ecology16
- Ch. 52 - Community Ecology20
- Ch. 53 - Ecosystems and Global Ecology17
- Ch. 54 - Biodiversity and Conservation Ecology18
Freeman8th EditionBiological ScienceISBN: 9780138276263Non è quello che usi tu?Cambia libro di testo
Capitolo 15, Problema 7
How does telomerase prevent linear chromosomes from shortening during replication?
Guida verificata passo dopo passo1
Understand the structure of chromosomes: Chromosomes are made up of DNA and proteins, and they have structures called telomeres at their ends. Telomeres consist of repetitive sequences of DNA that do not code for any proteins but serve as protective caps to prevent the loss of important genetic information during cell division.
Recognize the problem of DNA replication: During DNA replication, the enzymes that copy DNA cannot replicate the very end of the chromosome, which leads to the shortening of the chromosome each time a cell divides. This shortening can eventually lead to the loss of vital genetic information if not counteracted.
Learn about the role of telomerase: Telomerase is an enzyme that adds repetitive nucleotide sequences to the ends of the telomeres. This enzyme includes a component that serves as a template for adding DNA sequences, thus extending the telomeres.
Connect telomerase activity to chromosome protection: By extending the telomeres, telomerase ensures that the shortening of chromosomes during replication does not reach the regions containing essential genes. This activity is crucial for maintaining the integrity and length of the chromosome over successive cell divisions.
Explore the implications of telomerase activity: Telomerase is particularly active in stem cells and cancer cells, allowing them to divide many times without DNA damage. Understanding telomerase and its regulation is important for insights into aging and cancer.
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Telomeres
Telomeres are repetitive nucleotide sequences located at the ends of linear chromosomes. They protect the chromosome from deterioration or fusion with neighboring chromosomes. Each time a cell divides, telomeres shorten, which can eventually lead to cellular aging and loss of genetic information.
Video consigliato:
04:25
Telomeres
Telomerase
Telomerase is an enzyme that adds nucleotide sequences to the ends of telomeres, counteracting the shortening that occurs during DNA replication. It is particularly active in stem cells and cancer cells, allowing them to maintain their telomere length and continue dividing beyond normal limits.
Video consigliato:
04:25Telomeres
DNA Replication
DNA replication is the process by which a cell duplicates its DNA before cell division. During this process, the DNA strands are unwound and each strand serves as a template for synthesizing a new complementary strand. However, the mechanism of replication can lead to the loss of telomeric DNA, which is where telomerase plays a crucial role.
Video consigliato:
03:37Introduction to DNA Replication
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What aspect of DNA structure makes it possible for the proteins of nucleotide excision repair to recognize many different types of DNA damage?
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What aspect of DNA structure makes it possible for the proteins of nucleotide excision repair to recognize many different types of DNA damage?
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