Table of contents

1. Introduction to Biology2h 42m
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 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 57m
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

Endomembrane System: Protein Secretion

General Biology

5. Cell Components

Endomembrane System: Protein Secretion

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0:59 minutes

Problem 1`

Textbook Question

Which structure is not part of the endomembrane system?
a. Nuclear envelope
b. Chloroplast
c. Golgi apparatus
d. Plasma membrane

Verified step by step guidance

Understand the components of the endomembrane system. The endomembrane system is a group of membranes and organelles in eukaryotic cells that work together to modify, package, and transport lipids and proteins. It includes the nuclear envelope, endoplasmic reticulum, Golgi apparatus, lysosomes, vacuoles, and the plasma membrane.

Identify the function of each structure listed in the options. The nuclear envelope surrounds the nucleus and is part of the endomembrane system. The Golgi apparatus modifies, sorts, and packages proteins and lipids, and is part of the endomembrane system. The plasma membrane is the cell's outer membrane and is part of the endomembrane system.

Consider the chloroplast. Chloroplasts are involved in photosynthesis and are found in plant cells. They have their own DNA and are not part of the endomembrane system.

Recognize that chloroplasts are similar to mitochondria in that they are semi-autonomous organelles with their own DNA and ribosomes, and they are not derived from the endomembrane system.

Conclude that the structure not part of the endomembrane system is the chloroplast, as it functions independently from the system and is involved in energy conversion rather than the modification and transport of proteins and lipids.

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Key Concepts

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

Endomembrane System

The endomembrane system is a group of membranes and organelles in eukaryotic cells that work together to modify, package, and transport lipids and proteins. It includes the nuclear envelope, endoplasmic reticulum, Golgi apparatus, lysosomes, and the plasma membrane. These components are interconnected either directly or through vesicle transport.

Chloroplast

Chloroplasts are organelles found in plant and algal cells responsible for photosynthesis. They contain their own DNA and are surrounded by a double membrane. Unlike components of the endomembrane system, chloroplasts are not involved in the transport or modification of proteins and lipids, making them distinct from the endomembrane system.

Plasma Membrane

The plasma membrane is the outer boundary of the cell, composed of a lipid bilayer with embedded proteins. It regulates the movement of substances in and out of the cell and is part of the endomembrane system. It plays a crucial role in cell communication and maintaining the cell's environment, linking it to other components of the system.