In eukaryotic cells, ribosomes are found both free in the cytosol and attached to the endoplasmic reticulum (ER). Proteins produced on the attached ribosomes are delivered to the ER, while proteins produced on free ribosomes are delivered to the cytosol. Briefly explain in one or two sentences the two processes in terms of the following:

1. ONE ultimate destination of a protein produced on an attached ribosome, and ONE general function of the protein (You do not need to identify the specific protein.)

2. ONE ultimate destination of a protein produced on a free ribosome, and ONE general function of the protein (You do not need to identify the specific protein.)

Explanation:

Proteins are synthesized by the process known as translation. Translation occurs by ribosomes as they can be attached with endoplasmic reticulum or they can be free in the cytosol.

Protein is synthesized according to the sequence of nucleotide on mRNA.

Newly synthesized protein contain signals  sequence which targets then for their final destination.

1. ONE ultimate destination of a protein produced on an attached ribosome:  These proteins, after synthesis enter into ER and then according to the signal sequence, they reach to their final destination.

Example: cell membrane.

One general function of the protein -  to be a surface receptor

2. One ultimate destination of a protein produced on a free ribosome: cytosol

One general function of the protein: microfilaments

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