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

6. The Membrane

Passive vs. Active Transport

General Biology

6. The Membrane

Passive vs. Active Transport

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Multiple Choice

How does active transport differ from passive transport across a cell membrane?

Active transport moves substances down their concentration gradient, while passive transport moves them against the gradient.

Passive transport only occurs in plant cells, while active transport occurs in all cells.

Passive transport requires carrier proteins, while active transport does not use any proteins.

Active transport requires energy input (usually ATP), while passive transport does not.

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Verified step by step guidance

Step 1: Define active transport and passive transport. Active transport is the movement of substances across a cell membrane against their concentration gradient (from low to high concentration) and requires energy input, typically in the form of ATP. Passive transport, on the other hand, is the movement of substances down their concentration gradient (from high to low concentration) and does not require energy input.

Step 2: Explain the role of energy in active transport. Active transport relies on cellular energy (ATP) to power transport proteins that move substances against their concentration gradient. This process is essential for maintaining concentration differences across the membrane.

Step 3: Discuss the role of proteins in both transport types. Active transport uses specific carrier proteins or pumps, such as the sodium-potassium pump, to move substances. Passive transport can involve simple diffusion, facilitated diffusion (using carrier or channel proteins), or osmosis, but it does not require energy.

Step 4: Highlight the direction of movement relative to the concentration gradient. Active transport moves substances from areas of lower concentration to areas of higher concentration, while passive transport moves substances from areas of higher concentration to areas of lower concentration.

Step 5: Summarize the key difference. The main distinction is that active transport requires energy input (ATP) to function, whereas passive transport occurs naturally without the need for energy.