6. The Membrane

Concentration Gradients and Diffusion

Concentration gradients | Membranes and transport | Biology | Khan Academy

Concentration Gradients VS Electrochemical Gradients | With Examples

Diffusion

Animation: Diffusion

What is Diffusion? How Does it Work? What Factors Affect it? #7

It’s a process where water moves across a semi-permeable membrane to a region of high solute concentration.

It requires an expenditure of energy by the cell.

It’s a process where molecules move from a region of lower concentration to a region of higher concentration.

It’s a process where molecules move from a region of higher concentration to a region of lower concentration.

<p>Which of the following statements about diffusion is true?</p>

2) Concentration Gradients

A substance moving across a membrane against a concentration gradient is moving by                   .
a. passive transport;
b. osmosis;
c. facilitated diffusion;
d. active transport;
e. diffusion

Simple diffusion - concentration gradients

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1. Introduction to Biology

2. Chemistry

3. Water

4. Biomolecules

5. Cell Components

7. Energy and Metabolism

8. Respiration

9. Photosynthesis

10. Cell Signaling

11. Cell Division

12. Meiosis

13. Mendelian Genetics

14. DNA Synthesis

15. Gene Expression

16. Regulation of Expression

17. Viruses

18. Biotechnology

19. Genomics

20. Development

21. Evolution by Natural Selection

22. Evolution of Populations

23. Speciation

24. History of Life on Earth

25. Phylogeny

26. Prokaryotes

27. Protists

28. Plants

29. Fungi

30. Overview of Animals

31. Invertebrates

32. Vertebrates

33. Plant Anatomy

34. Vascular Plant Transport

35. Soil

36. Plant Reproduction

37. Plant Sensation and Response

38. Animal Form and Function

39. Digestive System

40. Circulatory System

41. Immune System

42. Osmoregulation and Excretion

43. Endocrine System

44. Animal Reproduction

45. Nervous System

46. Sensory Systems

47. Muscle Systems

48. Ecology

49. Animal Behavior

50. Population Ecology

51. Community Ecology

52. Ecosystems

53. Conservation Biology

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Types of Membrane Proteins

Introduction to Membrane Transport

Biological Membranes

Passive vs. Active Transport

Simple and Facilitated Diffusion

Endocytosis and Exocytosis

Osmosis

Active Transport

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