Molecular biologists are investigating the functional significance of non-coding RNA molecules. During an experiment, they isolate large complexes containing both protein and RNA from exocrine pancreatic cells. The complexes are found both freely floating in the cytoplasm and bound to the endoplasmic reticulum. The RNA found within these complexes is primarily synthesized at which of the following intracellular sites? 
Definitions:
Age Groups
Categories of people classified according to their ages, often used in research and demographic studies to understand behavior and needs specific to those stages of life.
Gender
The range of characteristics pertaining to, and differentiating between, masculinity and femininity, often based on social and cultural differences rather than biological ones.
Donald Super
An American psychologist known for his theories on careers and vocational development.
Career Development
The process by which individuals explore, establish, and pursue paths in a career over the lifespan.
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