Which list shows the correct order of locations and steps in protein processing?
A. 1. endoplasmic reticulum (protein modification)
2. Golgi apparatus (protein packaging)
3. ribosome (protein synthesis)
B. 1. ribosome (protein synthesis)
2. endoplasmic reticulum (protein modification)
3. Golgi apparatus (protein packaging)
C. 1. Golgi apparatus (protein packaging)
2. ribosome (protein synthesis)
3. endoplasmic reticulum (protein modification)
D. 1. ribosome (protein synthesis)
2. Golgi apparatus (protein packaging)
3. endoplasmic reticulum (protein modification)
The correct order of locations and steps in protein processing is:
B. 1. ribosome (protein synthesis), 2. endoplasmic reticulum (protein modification), 3. Golgi apparatus (protein packaging)
To determine the correct order, we need to understand the different steps in protein processing and the locations where these steps occur.
1. Protein synthesis: Ribosomes are responsible for protein synthesis. They read the instructions encoded in messenger RNA (mRNA) and synthesize the corresponding protein chain.
2. Protein modification: After protein synthesis, the protein needs to undergo various modifications to acquire its functional form. The endoplasmic reticulum (ER) is the intracellular organelle where these modifications take place. These modifications can include folding, addition of specific sugar molecules (glycosylation), or removal of specific segments.
3. Protein packaging: Once the protein has been modified, it needs to be packaged and transported to its final destination within the cell or outside of it. This process occurs in the Golgi apparatus. The Golgi apparatus modifies and packages the proteins into vesicles, which can then be transported to their intended target.
Based on this information, we can conclude that the correct order of locations and steps in protein processing is B. 1. ribosome (protein synthesis), 2. endoplasmic reticulum (protein modification), 3. Golgi apparatus (protein packaging).