Table of contents

1. Introduction to Biology2h 40m
2. Chemistry3h 40m
3. Water1h 26m
4. Biomolecules2h 23m
5. Cell Components2h 26m
6. The Membrane2h 31m
7. Energy and Metabolism2h 0m
8. Respiration2h 40m
9. Photosynthesis2h 49m
10. Cell Signaling59m
11. Cell Division2h 47m
12. Meiosis2h 0m
13. Mendelian Genetics4h 44m
14. DNA Synthesis2h 27m
15. Gene Expression3h 20m
16. Regulation of Expression3h 31m
17. Viruses37m
- Viruses
  37m
18. Biotechnology2h 58m
19. Genomics17m
- Genomes
  17m
20. Development1h 5m
21. Evolution3h 1m
22. Evolution of Populations3h 52m
23. Speciation1h 37m
24. History of Life on Earth2h 6m
25. Phylogeny2h 31m
26. Prokaryotes4h 59m
27. Protists1h 12m
28. Plants1h 22m
29. Fungi36m
- Fungi
  19m
- Fungi Reproduction
  17m
30. Overview of Animals34m
- Overview of Animals
  34m
31. Invertebrates1h 2m
32. Vertebrates50m
33. Plant Anatomy1h 3m
34. Vascular Plant Transport2m
- Water Potential
  2m
35. Soil37m
- Soil and Nutrients
  20m
- Nitrogen Fixation
  16m
36. Plant Reproduction47m
- Flowers
  33m
- Seeds
  14m
37. Plant Sensation and Response1h 9m
38. Animal Form and Function1h 19m
39. Digestive System10m
- Digestion
  3m
- Blood Sugar Homeostasis
  7m
40. Circulatory System1h 57m
41. Immune System1h 12m
42. Osmoregulation and Excretion50m
- Osmoregulation and Excretion
  50m
43. Endocrine System4m
- Endocrine System
  4m
44. Animal Reproduction2m
- Animal Reproduction
  2m
45. Nervous System55m
- Neurons and Action Potentials
  8m
- Central and Peripheral Nervous System
  46m
46. Sensory Systems46m
- Sensory System
  46m
47. Muscle Systems23m
- Musculoskeletal System
  23m
48. Ecology3h 11m
49. Animal Behavior28m
- Animal Behavior
  28m
50. Population Ecology3h 41m
51. Community Ecology2h 46m
52. Ecosystems2h 36m
53. Conservation Biology24m
- Conservation Biology
  24m

14. DNA Synthesis

Introduction to DNA Replication

General Biology

14. DNA Synthesis

Introduction to DNA Replication

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Multiple Choice

Which of the following is incorrect regarding DNA replication forks?

DNA replication forks begin forming at the origin of replication (ORI).

DNA replication forks are caused by helicase separating two complementary strands of DNA.

There are two replication forks found in each replicating prokaryotic chromosome.

DNA replication forks are found at both ends of the replication 'bubble'.

None of the above are incorrect.

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Verified step by step guidance

Understand the concept of a DNA replication fork: A replication fork is a structure that forms within the long helical DNA during DNA replication. It is created by helicases, which break the hydrogen bonds holding the two DNA strands together, allowing each strand to be copied.

Identify the origin of replication (ORI): The ORI is a specific sequence in the genome where replication begins. In prokaryotes, there is typically a single ORI, while eukaryotes have multiple ORIs.

Examine the role of helicase: Helicase is an enzyme that unwinds the DNA double helix into two single strands, creating the replication fork. This is a crucial step in DNA replication as it allows the DNA polymerase to access the single strands for replication.

Consider the number of replication forks in prokaryotic chromosomes: In prokaryotic cells, which typically have circular DNA, replication is bidirectional, meaning two replication forks are formed and move in opposite directions from the ORI.

Understand the replication 'bubble': As the DNA unwinds, a replication bubble forms, with replication forks at each end. This bubble expands as replication proceeds, allowing the entire DNA molecule to be replicated efficiently.