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 6
Analyze the following statements about DNA synthesis. Select True or False for each statement.
T/FAn RNA polymerase is essential for DNA synthesis.
T/FOkazaki fragments would be unnecessary if DNA polymerase could synthesize DNA in both the 3'→5' and 5'→3' directions.
T/FDNA ligase is used more frequently on the lagging strand than on the leading strand.
T/FToposiomerase is required to separate the two strands of DNA at the replication fork.
Guida verificata passo dopo passo1
Understand the role of RNA polymerase: RNA polymerase is primarily involved in the synthesis of RNA from a DNA template during transcription, not DNA synthesis. DNA synthesis requires DNA polymerase, not RNA polymerase.
Consider the directionality of DNA synthesis: DNA polymerase synthesizes DNA only in the 5' to 3' direction. Okazaki fragments are short sequences synthesized on the lagging strand because DNA polymerase cannot synthesize in the 3' to 5' direction. If DNA polymerase could synthesize in both directions, Okazaki fragments would not be necessary.
Examine the function of DNA ligase: DNA ligase is an enzyme that joins DNA fragments together. On the lagging strand, multiple Okazaki fragments are synthesized, requiring DNA ligase to join them. The leading strand is synthesized continuously, so DNA ligase is used less frequently.
Clarify the role of topoisomerase: Topoisomerase helps relieve the tension in the DNA helix during replication but does not separate the strands. Helicase is the enzyme responsible for unwinding and separating the two strands at the replication fork.
Review each statement based on the explanations provided: Use the understanding of each enzyme's role and the process of DNA synthesis to determine the truthfulness of each statement.
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DNA Polymerase Directionality
DNA polymerase synthesizes DNA in the 5' to 3' direction, which is crucial for understanding why Okazaki fragments are formed. On the lagging strand, DNA polymerase must work in short segments, creating Okazaki fragments, because it cannot synthesize in the 3' to 5' direction. This limitation necessitates the discontinuous synthesis of DNA on the lagging strand.
Video consigliato:
04:01
DNA Polymerases
Role of DNA Ligase
DNA ligase is an enzyme that joins DNA fragments together by forming phosphodiester bonds. It is used more frequently on the lagging strand during DNA replication because it is responsible for connecting the Okazaki fragments into a continuous strand. On the leading strand, DNA synthesis is continuous, requiring less frequent use of DNA ligase.
Video consigliato:
02:09Step 1) Create Recombinant DNA
Function of Topoisomerase
Topoisomerase is an enzyme that helps relieve the tension in the DNA helix ahead of the replication fork by cutting, unwinding, and rejoining DNA strands. It is not directly involved in separating the two strands of DNA; this task is performed by helicase. Topoisomerase ensures that the DNA does not become overly coiled or tangled during replication.
Video consigliato:
06:04Functional Groups
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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?
(b) the antiparallel orientation of strands in the double helix
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Researchers design experiments so that only one thing is different between the treatments that are being compared. In the Hershey–Chase experiment, what was this single difference?
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How does telomerase prevent linear chromosomes from shortening during 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?
(a) the polarity of each DNA strand
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Domanda del libro di testo
How are Okazaki fragments synthesized?
a. By using the leading-strand template, and synthesizing 5'→3'
b. By using the leading-strand template, and synthesizing 3'→5'
c. By using the lagging-strand template, and synthesizing 5'→3'
d. By using the lagging-strand template, and synthesizing 3'→5'.
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