Table of contents

1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 36m
3. Energy & Cell Processes10h 6m
4. Tissues & Histology10h 3m
5. Integumentary System2h 20m
6. Bones & Skeletal Tissue2h 16m
7. The Skeletal System2h 35m
8. Joints2h 17m
9. Muscle Tissue2h 33m
10. Muscles1h 11m
11. Nervous Tissue and Nervous System1h 35m
12. The Central Nervous System1h 6m
- Introduction to the Central Nervous System
  18m
- The Cerebrum
  48m
13. The Peripheral Nervous System1h 26m
14. The Autonomic Nervous System1h 38m
15. The Special Senses2h 41m
16. The Endocrine System2h 48m
17. The Blood3h 22m
18. The Heart3h 42m
19. The Blood Vessels3h 35m
20. The Lymphatic System3h 16m
21. The Immune System14h 37m
22. The Respiratory System3h 20m
23. The Digestive System2h 5m
24. Metabolism and Nutrition4h 0m
25. The Urinary System2h 39m
26. Fluid and Electrolyte Balance, Acid Base Balance37m
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. Heredity3h 32m

2. Cell Chemistry & Cell Components

Endomembrane System: Protein Secretion

Anatomy & Physiology

2. Cell Chemistry & Cell Components

Endomembrane System: Protein Secretion

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Multiple Choice

Consider a protein that is made in the rough endoplasmic reticulum. You observe that when the synthesis of the protein is completed, the protein is located in the ER membrane. Where else in the cell might this protein be found?

In the aqueous interior of a lysosome, functioning as a digestive enzyme

In the cytoplasm, functioning as an enzyme in carbohydrate synthesis

In the internal space of the Golgi apparatus, being modified before the protein is excreted

In a mitochondrion, functioning in ATP synthesis

Embedded in the plasma membrane, functioning in the transport of molecules into the cell

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Verified step by step guidance

Understand the initial location of the protein: The protein is synthesized in the rough endoplasmic reticulum (ER) and is located in the ER membrane. This suggests that the protein is likely to be a membrane protein.

Consider the pathway of membrane proteins: Proteins synthesized in the rough ER can be transported to the Golgi apparatus for further modification. From the Golgi, they can be directed to various destinations, including the plasma membrane.

Evaluate the possible destinations: Membrane proteins can be embedded in the plasma membrane, where they often function in transport, signaling, or cell recognition.

Eliminate unlikely options: The protein is unlikely to be found in the aqueous interior of a lysosome or in the cytoplasm, as these locations are not typical for membrane proteins. Similarly, it is unlikely to be in a mitochondrion, as proteins for mitochondria are usually synthesized in the cytoplasm and imported into the mitochondria.

Conclude the most likely location: Given the protein's initial location in the ER membrane and the typical pathway for membrane proteins, it is most likely to be embedded in the plasma membrane, functioning in the transport of molecules into the cell.