Question

1. where are ribosomes found within a eukaryotic cell?

a. both free - floating in the cytoplasm and attached to the rough er.
b. only within the mitochondria.
c. only attached to the golgi apparatus.
d. only within the nucleus.

Explanation:

Ribosomes are cellular structures involved in protein synthesis. In eukaryotic cells, some ribosomes are free - floating in the cytoplasm, synthesizing proteins that function within the cytoplasm. Others are attached to the rough endoplasmic reticulum (rough ER). The rough ER gets its name from the ribosomes attached to its surface, and these ribosomes synthesize proteins that are either secreted from the cell or incorporated into the cell membrane or other organelle membranes.
Mitochondria have their own ribosomes, but they are not the only location. The Golgi apparatus is involved in modifying, sorting, and packaging proteins (not the site of ribosome attachment for general protein synthesis). The nucleus is where DNA is stored and transcribed, not a site for ribosome - based protein synthesis (except for the nucleolus which is involved in ribosome assembly but not the location of functional ribosomes for general protein synthesis as described in the options).

Answer:

A. Both free - floating in the cytoplasm and attached to the rough ER.