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Chapter 3: Problem 22

Vesicles carrying proteins for secretion move from the ER to the a. smooth ER. b. lysosomes. c. Golgi apparatus. d. nucleolus.

Short Answer

Expert verified
The correct destination for vesicles carrying proteins for secretion after they move from the endoplasmic reticulum (ER) is the Golgi apparatus (option c). This is because the Golgi apparatus processes, sorts, and packages proteins for secretion or delivery to other organelles.

Step by step solution

01

The secretory pathway involves protein synthesis, folding, and trafficking to their correct destinations within or outside the cell. The process begins with protein synthesis in the rough endoplasmic reticulum (ER) and continues through various cellular compartments. #Step 2: Eliminate incorrect options#

To answer this question, eliminate options that clearly don't make sense in the context of protein secretion. The nucleolus is involved in ribosome synthesis, not protein secretion, so option d is incorrect. Similarly, smooth ER is involved in lipid synthesis and metabolism, not protein secretion, so option a can be disregarded. #Step 3: Consider the role of lysosomes#
02

Lysosomes, as mentioned in option b, are membrane-bound organelles that contain digestive enzymes. They are responsible for breaking down and recycling cellular waste and foreign materials. While vesicles containing proteins for degradation can fuse with lysosomes, those carrying proteins for secretion take a different path. #Step 4: Identify the correct destination#

Once synthesized and folded in the rough ER, proteins are transported in vesicles to the Golgi apparatus (option c). The Golgi apparatus is a network of membrane-enclosed compartments involved in processing, sorting, and packaging proteins for secretion or delivery to other organelles. Proteins are further modified in the Golgi apparatus and then packaged into vesicles, which move towards the cell membrane and fuse with it, releasing the proteins outside the cell. So, the correct answer is: c. Golgi apparatus.

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