Questions: A vesicle containing a membrane protein is about to fuse with the plasma membrane and deliver its contents. Where did it most likely just come from? smooth endoplasmic reticulum Rough endoplasmic reticulum nucleus trans face of the golgi cis face of the golgi

A vesicle containing a membrane protein is about to fuse with the plasma membrane and deliver its contents. Where did it most likely just come from? smooth endoplasmic reticulum Rough endoplasmic reticulum nucleus trans face of the golgi cis face of the golgi
Transcript text: A vesicle containing a membrane protein is about to fuse with the plasma membrane and deliver its contents. Where did it most likely just come from? smooth endoplasmic reticulum Rough endoplasmic reticulum nucleus trans face of the golgi cis face of the golgi
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Solution

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The answer is the fourth one: trans face of the Golgi.

Explanation for each option:

  1. Smooth endoplasmic reticulum: The smooth ER is primarily involved in lipid synthesis and detoxification processes. It does not typically handle the packaging and delivery of membrane proteins.

  2. Rough endoplasmic reticulum: While the rough ER is involved in the synthesis of membrane proteins and proteins destined for secretion, vesicles containing these proteins are usually sent to the Golgi apparatus for further processing and sorting.

  3. Nucleus: The nucleus is the site of DNA storage and transcription. It does not directly handle the transport of vesicles containing membrane proteins to the plasma membrane.

  4. Trans face of the Golgi: The trans face of the Golgi apparatus is the side from which vesicles bud off to be transported to their final destinations, including the plasma membrane. Therefore, a vesicle containing a membrane protein that is about to fuse with the plasma membrane most likely just came from the trans face of the Golgi.

  5. Cis face of the Golgi: The cis face of the Golgi is the receiving side where vesicles from the ER arrive. It is not the final step before vesicles are sent to the plasma membrane.

Summary: A vesicle containing a membrane protein that is about to fuse with the plasma membrane most likely just came from the trans face of the Golgi.

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