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

5. Cell Components

Prokaryotic & Eukaryotic Cells

General Biology

5. Cell Components

Prokaryotic & Eukaryotic Cells

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0:41 minutes

Problem 1

Textbook Question

In what way do the membranes of a eukaryotic cell vary?
a. Phospholipids are found only in certain membranes.
b. Certain proteins are unique to each membrane.
c. Only certain membranes of the cell are selectively permeable.
d. Only certain membranes are constructed from amphipathic molecules.

Verified step by step guidance

Understand that eukaryotic cells have various types of membranes, each with specific functions and compositions.

Recognize that phospholipids are a fundamental component of all eukaryotic cell membranes, not just certain ones, making option a incorrect.

Identify that proteins embedded in membranes can vary significantly between different types of membranes, as they are tailored to the specific functions of each membrane, supporting option b.

Recall that all eukaryotic cell membranes exhibit selective permeability, allowing certain substances to pass while blocking others, which makes option c incorrect.

Note that amphipathic molecules, such as phospholipids, are a common structural feature of all cell membranes, not just certain ones, making option d incorrect.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Membrane Composition

Eukaryotic cell membranes are primarily composed of a phospholipid bilayer, which provides structural integrity and fluidity. Phospholipids are amphipathic molecules, meaning they have both hydrophilic and hydrophobic parts, allowing them to form bilayers. While phospholipids are common to all membranes, the specific types and ratios can vary, influencing membrane properties.

Membrane Proteins

Membrane proteins are crucial for various functions, including transport, signaling, and structural support. Each membrane within a eukaryotic cell can have a unique set of proteins tailored to its specific function. For example, the mitochondrial membrane has proteins involved in energy production, while the plasma membrane contains receptors for cell communication.

Selective Permeability

Selective permeability refers to a membrane's ability to regulate the passage of substances. This property is essential for maintaining homeostasis within the cell. While all eukaryotic membranes exhibit selective permeability to some degree, the extent and specificity can vary depending on the membrane's role, such as the nuclear envelope selectively allowing RNA and proteins to pass.