Table of contents

1. Introduction to Biology2h 42m
2. Chemistry3h 37m
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 6m
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 53m
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 Transport1h 2m
- Water Potential
  1h 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 System1h 10m
- Digestion
  1h 3m
- Blood Sugar Homeostasis
  7m
40. Circulatory System1h 49m
41. Immune System1h 12m
42. Osmoregulation and Excretion50m
- Osmoregulation and Excretion
  50m
43. Endocrine System1h 4m
- Endocrine System
  1h 4m
44. Animal Reproduction1h 2m
- Animal Reproduction
  1h 2m
45. Nervous System1h 55m
- Neurons and Action Potentials
  1h 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

10. Cell Signaling

Introduction to Cell Signaling

General Biology

10. Cell Signaling

Introduction to Cell Signaling

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Multiple Choice

Why does stem-cell research often generate more debate than consensus in scientific and public discussions?

Because stem-cell research has no potential for medical applications.

Because stem cells cannot be cultured in laboratory conditions.

Because all scientists agree on the methods and outcomes of stem-cell research.

Because it raises complex ethical questions regarding the use of embryonic cells.

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Verified step by step guidance

Understand the concept of stem cells: Stem cells are undifferentiated cells that have the potential to develop into various specialized cell types. They are crucial for medical research due to their ability to regenerate damaged tissues and treat diseases.

Recognize the types of stem cells: There are different types of stem cells, including embryonic stem cells, adult stem cells, and induced pluripotent stem cells. Embryonic stem cells are derived from early-stage embryos and have the highest potential for differentiation, which is why they are often the focus of ethical debates.

Identify the ethical concerns: The use of embryonic stem cells involves the destruction of embryos, which raises moral and ethical questions about the beginning of human life and the rights of embryos. This is a key reason why stem-cell research generates significant debate.

Consider the scientific and public perspectives: Scientists may focus on the potential medical benefits of stem-cell research, such as curing diseases and advancing regenerative medicine. However, public discussions often include diverse viewpoints influenced by cultural, religious, and personal beliefs.

Understand the complexity of consensus: Due to the intersection of science, ethics, and personal values, achieving consensus on stem-cell research is challenging. While some support the research for its medical potential, others oppose it due to ethical concerns, leading to ongoing debates.